Thursday, May 31, 2012
NOGAPS suggest that Monsoon current will reach Kerala coast on 1-Jun, afternoon .. http://ow.ly/i/FbGB
As of today's analysis, Perfect monsoon set and heavy rain for Kerala will start after 4-Jun.. http://ow.ly/i/Fapr
Circulation over W-central Arabian sea persists and shows NO sign of strengthening ... http://ow.ly/i/Fan9
@fabwrite >> chennai - NO rain possible today, but going to be a Cloudy, WARM and Windy day.. (wind will be from WEST). http://ow.ly/i/FajC
Category:
chennai
RT @rajugana: Baroda 11.00am, Sunny, strong winds from SW, for the first time patches of passing clouds .. a pic http://t.co/4eZIjzDJ
chennai - COOL at 12:10pm.. 36.0°C.. Heavy high cloud cover continues with good Breeze from West.
Category:
chennai
Wednesday, May 30, 2012
High day temperatures of Wednesday, 30th May:
In Pakistan, Sibi touched 49.0c, Jacobabad touch 48.5c, While Multan sees 48.0c. Sukkur soared to 47c.
Islamabad saw an unusual high of 43c.
Wednesday,30th, in India, it was 47c at not only the usual places in Vid. like Brahmapuri reached 47.6c Chandrapur saw 47c and Wardha at 46.9c , Allahbad at 46..8c, Nagpur at 46.6c, Agra at 46.5c and c, but the 47c has crept into Punjab with Amritsar touching 47.0c and Hissar at 46.4c today.
The Rajasthan Desert is in the 45/46c range with Bikaner and Kota at 45.8c and Jaisalmer seeing 45.4c,along with Delhi ( S'Jung) also at 45.0c on Wednesday.
Nagpur's minimum bottomed at only 33.6c today.
Monsoon may initially avoid Tamil Nadu for a week, and move along west coast...more on Vagaries.
In Pakistan, Sibi touched 49.0c, Jacobabad touch 48.5c, While Multan sees 48.0c. Sukkur soared to 47c.
Islamabad saw an unusual high of 43c.
Wednesday,30th, in India, it was 47c at not only the usual places in Vid. like Brahmapuri reached 47.6c Chandrapur saw 47c and Wardha at 46.9c , Allahbad at 46..8c, Nagpur at 46.6c, Agra at 46.5c and c, but the 47c has crept into Punjab with Amritsar touching 47.0c and Hissar at 46.4c today.
The Rajasthan Desert is in the 45/46c range with Bikaner and Kota at 45.8c and Jaisalmer seeing 45.4c,along with Delhi ( S'Jung) also at 45.0c on Wednesday.
Nagpur's minimum bottomed at only 33.6c today.
Monsoon may initially avoid Tamil Nadu for a week, and move along west coast...more on Vagaries.
Strong winds from W,N-W will continue over N. Tamilnadu, Entire Andhra, E.Maharastra and chennai till 2-Jun.. http://ow.ly/i/F4dx
Category:
chennai
Today, a circulation is seen over Chatisgarh, Orissa and N,N-E Andhra .. and another over E.Uttarpradesh.. http://ow.ly/i/F4b3
Latest NOGAPS model says, that a Monsoon will set in over Kerala on afternoon of 1-Jun.. http://ow.ly/i/F3Ly
Temperature over S,S-E peninsula (including chennai) will reduce by 2/3 deg C after 3-Jun .. http://ow.ly/i/F3yY
Category:
chennai
Tuesday, May 29, 2012
NOGAPS still predicts that monsoon current will reach Kerala by 1-Jun and sees NO circulation over W-central Arabian sea http://ow.ly/i/ESuF
NOGAPS model suggests that Monsoon showers will pick up strength only after 4-Jun over Kerala ... http://ow.ly/i/ESs7
Stiff W,N-W winds from morning till 2pm will continue for another 3 days over Andhra, N.Tamilnadu, chennai , E.Maharastra.
Category:
chennai
Today as well a low level circulation persists over Chatisgarh, Orissa and E.Maharastra, and another over E.UP & Bihar. http://ow.ly/i/ER25
Upcoming W-central Arabian sea LOW >> "few other models which do not agree and show NO low formation" .. http://ow.ly/bcY79
RT @rajugana: @weatherofindia Migratory storks’ early arrival raises monsoon hopes
http://ow.ly/bcWIk
http://ow.ly/bcWIk
A couple of International Forecasting Models estimate a low pressure to form in the Arabian Sea, around 10N and 60E by the 1st of June. There are few other models which do not agree and show NO low formation in the region around that time frame.
With 2 diverse opinions by several International Models, it becomes confusing for the average reader to actually judge or estimate the fact, especially at a critical time when the SWM is advancing along the West Coast of India.
Vagaries' View:
Citing the "patch" of higher SST in the Central regions of the Arabian Sea (around 55-60E), it is possible that a low pressure system can form in the region by the 1st/2nd June.
But, as it travels North, it can encounter a slightly colder sea, thus limiting its growth. The low, initially could be at 1000 mb, can deepen to 996 mb by the 4th of June, before it starts weakening again from the 5th.
In next 24hrs, isolated Heavy T.showers possible for N-central,central Tamilnadu and over N.Kerala W.Ghats.. http://ow.ly/i/EQLG
COLA predicts a weak monsoon will set in over Kerala coast on 1-Jun and expected to pick up after 4-Jun.. http://ow.ly/i/EQKo
COLA models still suggest a strong circulation over W-central Arabian sea on 1-June and will move N-N-E .. http://ow.ly/i/EQJE
Till 8:30am today, chennai 's high temp. was 42.9 deg C and Low temp. was 30.3 deg C
Category:
chennai
N.Bay has popped a fresh Circulation ... http://ow.ly/i/EQIl >> this will pull the Monsoon well upto North Bay.
Monday, May 28, 2012
NOGAPS models suggest that Monsoon will reach Kerala on 1-Jun and Rain will increase only after 3-Jun. http://ow.ly/i/EKMc
COLA models suggest that very less showers forecast for Kerala on 1,2,3-Jun.. OR the onset itself will be delayed.. http://ow.ly/i/EJRO
Latest COLA models suggest a strong circulation over S-W-Central Arabian sea on 1-Jun.. http://ow.ly/i/EJR9
@nithyanexo >> chennai - Possibility of afternoon T.showers will increase only after 3-Jun.
Category:
chennai
@nithyanexo >> chennai - No rain forecast till 2-Jun, Upper level moisture presence expected to increase after 2-Jun.
Category:
chennai
chennai - at 12:10pm temp. was 39.0°C .. another 41 deg C on cards. And having breeze from W-S-W .. http://ow.ly/i/EILJ
Category:
chennai
RT @rajugana: @weatherofindia; Last week (17th May) before landing chennai sky turned cloudy, a pic http://t.co/Wn1y76bI
Sunday, May 27, 2012
chennai - have stiff breeze from W-N-W and N-W ... this will not allow the Rain bringing Sea breeze to set in.!
Category:
chennai
Today, Vorticity is high over N.N-E (includes chennai) and Central Tamilnadu ... T.showers possible after 2pm.. http://ow.ly/i/EDve
Category:
chennai
Monsoon Watch - 7 by "vagaries of the weather"
SWM has further moved into Southern Sri Lanka. Maldives and Northern Andaman Sea.
Galle in Sri Lanka recieved 63mms of rain and Ratnapura got 30 mms on Saturday, 26th, while Colombo measured 15 mms.
Cross Equatorial Flow has picked up considerably in the Bay and Arabian Sea. Winds over 30-35 knts are seen gushing Northwards off the Somali Coast, and 40 knts winds are seen in the Bay.
Winds off the Sri Lanka coast have picked up considerably.
Today's SST map is reproduced here to show the Sea temperature not falling sufficiently yet along the Somali coast. It is presently around 24c. Now, this difference with the Central Arabian Sea plays a key role in cloud formations off the Western Coastline of India in the Central Arabian Seas. The SST along the Somali coast will rapidly fall to around 18/20c in the next 10 days.
But the current fall is sufficient to help form Monsoon clouds around the Maldives. Cloud formation near Sri Lanka is gathering, and in next 24 hrs, wind speed along the Sri Lanka coast is estimated at 35 mph (in gusts).
A slight fall is seen in the Bay water's SST.
The ITCZ is slowly moving up, but is still around the Equator regions, and in the 5N region in the Bay sector.
SWM should set in over Sri Lanka within next 24 hrs, that is by the 28th May.
The Seasonal Low seems to have strengthened. We see today's pressure at 998 mb. Getting gradually ready enough to create a gradiant to pull up SW winds into the mainland. The day temperatures on the Sub-Continent Northern plains are on the higher side since Wednesday, with the average the day's highs are around 42/43c. Across in Pakistan' Sindh region, the core area for the formation of the low, the highest was 46c on Saturday. M-5 effect was expected bring about a slight fall in the day readings(reported in Vagaries yesterday).
M-5 is seen moving away from India. WDs should slow down now, as the jet streams at 200 hpa are re-grouping fast into position.
The Jet Stream Westerlies are almost upto the 15N line, and the "High" formation is taking shape East of Bangladesh. Expected movement of this "High" should be inland towards MP for perfect position.
The Bay sector SWM has been stagnant, and not picking up as expected from a "setting in" Monsoon. Its lack of systems could be attributed to M-4/5. Strong westerly currents prevent the formation of lows to move into the bay and towards the Indian mainland. They divert the forming currents.
As SW winds should pick up speed in the next 2 days, SWM "in situ", could advance further into the Bay. Better before another WD reaches the region to spoil the "party".
Conclusion: SWM advancing into Sri Lanka by 28th (late by 3 days).
Advance into Kerala around Vagaries' expected date, 3rd/4th June. But, further advance would need monitoring.
Possibly into Coastal Karnataka and Southern TN regions by the 7th of June.
South Konkan and Goa around 8th June, and Mumbai by 13th/14th June.
Taken from http://rajesh26.blogspot.in/
Galle in Sri Lanka recieved 63mms of rain and Ratnapura got 30 mms on Saturday, 26th, while Colombo measured 15 mms.
Cross Equatorial Flow has picked up considerably in the Bay and Arabian Sea. Winds over 30-35 knts are seen gushing Northwards off the Somali Coast, and 40 knts winds are seen in the Bay.
Winds off the Sri Lanka coast have picked up considerably.
Today's SST map is reproduced here to show the Sea temperature not falling sufficiently yet along the Somali coast. It is presently around 24c. Now, this difference with the Central Arabian Sea plays a key role in cloud formations off the Western Coastline of India in the Central Arabian Seas. The SST along the Somali coast will rapidly fall to around 18/20c in the next 10 days.
But the current fall is sufficient to help form Monsoon clouds around the Maldives. Cloud formation near Sri Lanka is gathering, and in next 24 hrs, wind speed along the Sri Lanka coast is estimated at 35 mph (in gusts).
A slight fall is seen in the Bay water's SST.
The ITCZ is slowly moving up, but is still around the Equator regions, and in the 5N region in the Bay sector.
SWM should set in over Sri Lanka within next 24 hrs, that is by the 28th May.
The Seasonal Low seems to have strengthened. We see today's pressure at 998 mb. Getting gradually ready enough to create a gradiant to pull up SW winds into the mainland. The day temperatures on the Sub-Continent Northern plains are on the higher side since Wednesday, with the average the day's highs are around 42/43c. Across in Pakistan' Sindh region, the core area for the formation of the low, the highest was 46c on Saturday. M-5 effect was expected bring about a slight fall in the day readings(reported in Vagaries yesterday).
M-5 is seen moving away from India. WDs should slow down now, as the jet streams at 200 hpa are re-grouping fast into position.
The Jet Stream Westerlies are almost upto the 15N line, and the "High" formation is taking shape East of Bangladesh. Expected movement of this "High" should be inland towards MP for perfect position.
The Bay sector SWM has been stagnant, and not picking up as expected from a "setting in" Monsoon. Its lack of systems could be attributed to M-4/5. Strong westerly currents prevent the formation of lows to move into the bay and towards the Indian mainland. They divert the forming currents.
As SW winds should pick up speed in the next 2 days, SWM "in situ", could advance further into the Bay. Better before another WD reaches the region to spoil the "party".
Conclusion: SWM advancing into Sri Lanka by 28th (late by 3 days).
Advance into Kerala around Vagaries' expected date, 3rd/4th June. But, further advance would need monitoring.
Possibly into Coastal Karnataka and Southern TN regions by the 7th of June.
South Konkan and Goa around 8th June, and Mumbai by 13th/14th June.
Taken from http://rajesh26.blogspot.in/
Isolated T.showers expected over W.ghats of Kerala, N.central Tamilnadu, N,S,S-W Karnataka in next 24 hrs.. http://ow.ly/i/EDtc
Strong Winds from W,N-W will continue over E.Maharastra, N.Tamilnadu, chennai , and entire Andhra for another 3 days. http://ow.ly/i/EDsz
Category:
chennai
Here's the model map showing a circulation over W-central Arabian sea on 1-Jun .. http://ow.ly/i/EDrv
SWM has further moved into Southern Sri Lanka. Maldives and Northern Andaman Sea.
Galle in Sri Lanka recieved 63mms of rain and Ratnapura got 30 mms on Saturday, 26th, while Colombo measured 15 mms.
Cross Equatorial Flow has picked up considerably in the Bay and Arabian Sea. Winds over 30-35 knts are seen gushing Northwards off the Somali Coast, and 40 knts winds are seen in the Bay.
Winds off the Sri Lanka coast have picked up considerably.
A local heat vortex developing may bring about a thunders shower in and around Chennai on Sunday.
NW Sub-Continent day temperatures will further fall by around 2c next 2 days. However, the hot days in AP and coastal TN will see lower day temperatures from Monday, to the extent of 2.3c.
For Updates, keep checking on Indianweatherman and Monsoon Advance Map on "Current Weather Page"in Vagaries.
Saturday, May 26, 2012
RT @fabwrite: Another cloudy day in chennai with not a drop of rain!!! >> And Temperature touched a max. of 38 deg C .. @chennaiweather
Category:
chennai
5pm, Monsoon showers seen over Camorin Sea (area south of Kanyakumari) ... and heavy showers seen all over Andamans.. http://ow.ly/i/EyV3
Isolated Heavy T.showers possible for N,N-central,N-coastal Tamilnadu in next 24hrs.. http://ow.ly/i/EyTZ
COLA models suggest that Monsoon moisture & air current will reach S.Kerala on 2-Jun.. http://ow.ly/i/EyPq
Friday, May 25, 2012
Dengue death toll goes up to 32 in Nellai; one dies in Tuticorin (S.Tamilnadu) .. http://ow.ly/b9jO7 disaster
Category:
DISASTER
NO relent in HEAT for S,S-central and S-E India till 1-Jun.. Monsoon over Kerala will reduce the temp after 3-Jun.. http://ow.ly/i/Epjz
IMD :: Conditions are favourable for further advance of southwest monsoon into
some parts of Maldive and Comorin area. http://ow.ly/d/DBo
some parts of Maldive and Comorin area. http://ow.ly/d/DBo
Monsoon current / Somali jet is picking up strength and good Cross equatorial winds can be seen over S,S-W Arabian sea.. http://ow.ly/i/Eobi
Thursday, May 24, 2012
Heat Wave Intensifies in Pakistan:
The maximum Day temperature in Pakistan rose on Thursday to 48.5c at Dadu. followed closely by Larkana at 48c and Padidan measuring 47.5c. Sibbi was at a high of 46c. Sukkur saw a high of 45.5c
The nights are very moderate with Sibbi at 22c at Mirpur Khas dipping to 19.5c.
In India, Adilabad and Rentachintala(AP) soared to 47c, with a low at 33c at Adilabad ! On Thursday, Chandrapur reached 46.8c and Brahmapuri 46.5c. Nagpur touched 46.2c in the day and was 31.8c at night (Thursday morning).
Heat wave expected to persist till Sunday in Coastal AP and Chennai. Chennai may reach 43c and pesisit till Sunday between 41c and 43c. Minimums will be around 30c.
Link: Vagaries
Bay wing of Monsoon will proceed North and strengthen in another 2 days.. it'll cover entire Andamans around 28-May.. http://ow.ly/i/EcL6
chennai airport at 1:10pm has recorded a temp. of 41.0°C.. having breeze from W-S-W
Category:
chennai
SWM Crosses Andamans and Moves into Thailand. Ubon measures 62 mms and Phuket clocks winds at 57 knots.
See Vagaries for details.
See Vagaries for details.
8am, Heavy monsoon showers over S.Andaman Islands.. and showers seen over S.Srilanka .. http://ow.ly/i/EbPB
Tuesday, May 22, 2012
chennai - city may have 1 or 2 afternoon Thunder storm after 23-May..and before 31-May.
Category:
chennai
Most models suggest that Somali jet will attain strength and reach 10N and 63E over S.Arabian sea on 29-May.. http://ow.ly/i/DTIy
No sign of below 40 deg C for N,N-W, central, E-central, S-central and S-E India till 29-May.. http://ow.ly/i/DTGM
Isolated T.showers to continue over Kerala, N,central,S-central Tamilnadu for another 48 hrs.. http://ow.ly/i/DTEC
Today's E.Madhyapradesh circulation will move N-E and will be over Bihar in next 2 days.. http://ow.ly/i/DTCH
A circulation is persisting over E.Madhyapradesh, Chatisgarh .. and it's trough extends upto S-central Tamilnadu.. http://ow.ly/i/DTCb
Monsoon winds slowly making it's way into S,S-E Bay.. Will reach S.Andaman islands on 23/24-May.. http://ow.ly/i/DTzx
Monday, May 21, 2012
chennai - Temperature is going down fast as a good sea breeze has set in now 3:30pm
Category:
chennai
Latest models suggest, NO relenting in Severe heat wave across most of India till 28-May.. http://ow.ly/i/DJNE
Strong, Dry winds from N-W expected for N,central Karnataka, Entire Andhra, central,E.Maharastra, chennai after 24-May. http://ow.ly/i/DJM4
Category:
chennai
Today, a circulation can be seen over Chatisgarh, S-E Madhyapradesh.. and it's trough extends upto S. Tamilnadu.. http://ow.ly/i/DJIc
S-W Monsoon current will be over S,S-E Bay and reach S.Andaman islands on 23/24-May.. http://ow.ly/i/DJHr
After 24-May, early morning Monsoon style showers to start for S.Kerala and S.tip Tamilnadu.. http://ow.ly/i/DJGK
Isolated T.showers over W.ghats Kerala, Central Tamilnadu, S,S-W Karnataka to continue till 23-May.. http://ow.ly/i/DJGg
Present W.D over Kashmir & Himachal will last another 48hrs.. and next W.D will reach W.Kashmir on 26-May.. http://ow.ly/i/DJFM
The present Anti-cyclone over Central Arabian sea is expected to vanish in another 3 days giving way to Somali jet.. http://ow.ly/i/DJCY
Saturday, May 19, 2012
SWM has feebly moved into the Southern Bay Region.
SWM will start covering the complete Bay Islands from the 23rd, and subsequently, riding on a system, reach the NE states by the 1st of June.
SWM could be expected over the Maldives by the 23rd of May.(Normal date 20th). Over Sri Lanka around the 27th of May.
I would estimate the SWM to advance into Kerala around the dates initially estimated by Vagaries : June 3rd/4th could be the date for Kerala, but remain weakish till the middle of June in coastal Karnataka and Kerala.
Initially, riding on a strongish MJO wave, the SWM could precipitate good rains in Kerala. The further current into Kerala would be "reluctant" to move ahead in a weak MJO, as International forecasters predict the MJO phase in our seas to become weak after the 10th of June. This weak phase could last till 20th of June say the forecasts.
Nevertheless, the SWM could progessively advance into coastal Karnataka 48 hrs from 5th June. SWM could advance into interior Karnataka, Goa and S.Konkan by the 9th, and Mumbai by the 11th/13th. of June.
For full report and map see Vagaries.
Today, we have 2 circulations .. one over E.Bay along S.Myanmar and another over S-W Bay along Central Tamilnadu coast.. http://ow.ly/i/DxWf
RT @cannotableto: Welcome to Chennai. .. . Where hot air will blow at all times. >> chennai airport 41.0°C at 1:10pm
Category:
chennai
Chennai Delhi Nagpur Hyderabad Ahmedabad Varanasi .. Above 40 C day temp. till 26-May and beyond.. http://ow.ly/i/DxQv
Latest models suggest "SEVERE" Heat wave to continue over MOST of India till 26-May and beyond.. http://ow.ly/i/DxQv
RT @malhotramona: @weatherofindia @BeingSalmanKhan sunset from film city mumbai this evening http://t.co/6FcWlwe2 (18-May)
Friday, May 18, 2012
6:30pm, T.showers seen over S-W Bengal, Central Rajasthan, N,N-central Tamilnadu, S-W Kashmir .. http://ow.ly/i/Dpz5
chennai - now 3:23pm having good Sea breeze from E-S-E... temp. at 3:10pm was 37.0°C
Category:
chennai
Temperature at 1:30pm, Lucknow = 41.0°C, Nagpur = 45.0°C, Ahmedabad,Hyderabad, Delhi = 40.0°C
Category:
delhi
Due to present W.D, showers possible for Kashmir, Himachal, W,N,central Rajasthan for next 48hrs.. http://ow.ly/i/DnFF
Today, Vertical velocity is very high over S-central Tamilnadu .. T.showers possible for S,S-central Tamilnadu today.. http://ow.ly/i/DnFd
chennai - another above 41 deg C for City & Airport .. at 12:40pm it was 41.0°C (feels like 45.2°C)
Category:
chennai
By 22/23-May, S-W Monsoon will reach S.Andhaman Islands .. Pick up strength after 25-May.. http://ow.ly/i/DnAo
As the Somali jet picks up strength around 21-May, the present Anti-cyclone over Central Arabian sea will vanish.. http://ow.ly/i/Dnzc
Cross Equatorial winds & Somali Jet are getting ready to move into Arabian sea .. http://ow.ly/i/DnxK
RT @aknarendranath: At 24°C, Mumbai sees coldest May night in six years http://t.co/391fs8XG via @DNA @weatherofindia
Thursday, May 17, 2012
9pm, T.showers raging over central,N Tamilnadu, T.showers/drizzle possible for W.Rajasthan moving in from Pakistan.. http://ow.ly/i/DhHS
Severe HEAT wave to cover most of India upto S,S-E coast including chennai Delhi Kolkata ..till 24-May and beyond.. http://ow.ly/i/DgPl
T.showers near chennai.. seen here in this satellite IR image.. a lonely Thunder cell.. http://ow.ly/i/DeZ3
Category:
chennai
chennai - T.shower is moving south skirting along Western,S-W suburbs of city (3:49pm)... NO Rain for City !
Category:
chennai
RT @nilouferj: The rain has hit the outskirts of the city! Waiting for it to reach us! Finally a break from the scorching heat! chennai
Category:
chennai
chennai - after 42 deg C HEAT.. now 3:39pm a Thunder Squall is nearing West,S-W,N-W suburbs of City
Category:
chennai
chennai - a good sea breeze now 3:03pm is fueling the Thunder shower over N-W of City
Category:
chennai
chennai - a T.shower is raging over N-W at around 45 km from City.. showers possible for N-W,W.. suburbs of city.
Category:
chennai
chennai - T.shower seen over N-W at around 50km from city and North of Tiruvallur... T.cell formation possible over City as well in 1hr
Category:
chennai
Some Heavy T.showers possible for Central Bangladesh and Central Bengal from Today till 20-May.. http://ow.ly/i/Deqf
chennai - will experience DRY & HOT winds from W,N-W till 2pm, from Today till 24-May
Category:
chennai
For next 24hrs, T.showers possible for S.Karnataka, N,N-W Tamilnadu, N,central Kerala ... http://ow.ly/i/Delp
chennai - again touches 40.0°C, (feels like 46.0°C) at 12:40pm and expected to reach 41/42 before 2pm.
Category:
chennai
Wednesday, May 16, 2012
Latest models suggest that S-W Monsoon will reach S.Andamans by 22/23-May and Somali Jet will pick-up strength.. http://ow.ly/i/D7IX
Today's Super HEAT over most of N,N-W,central, E-central,S-central,S-E India to continue till 23-May and beyond.. http://ow.ly/i/D7GU
chennai - at around 2pm Sea breeze has set in.. and this is reducing the temp. gradually.. at 4:40pm, it was 35 degC
Category:
chennai
Cross equatorial winds into S,S-E Bay slowly increases in Speed... and Rain over S.Andamans also increases.. http://ow.ly/i/D6lC
Today as well, the vertical velocity is very high over S. Andhra ... Showers forecast for next 24hrs in this zone.. http://ow.ly/i/D5D5
Relentless above 40 deg C to continue for N-W,N, Central, E-central ,S-central and S-E coast India upto chennai, No end date in sight !!
Category:
chennai
Tuesday, May 15, 2012
2:30pm, T.showers are popping out all along S-E coast from Orissa, N-E, S Andhra, N. Tamilnadu and upto S.Kerala.. http://ow.ly/i/CWYN
200mb, high altitude Jet stream is slowly becoming Easterly .. will become easterly upto 20th parallel on 20-May.. http://ow.ly/i/CWX4
Seasonal HEAT Low over N-W, N, E-central India will deepen to 998hpa and take full shape after 21-May.. http://ow.ly/i/CWTk
Cross equatorial winds into S,S-E Bay to become strong after 21-May... meaning S-W Monsoon for S.Andaman is near.. http://ow.ly/i/CWSe
On 17-May a circulation will pop over Bihar .. and it's trough will extend South along S-E coast upto N. Tamilnadu.. http://ow.ly/i/CWRD
Moisture presence over S.Kerala to continue even after 18-May... Isolated T.showers to continue.. http://ow.ly/i/CWEz
T.showers still expected over S,S-W Karnataka, N,central Kerala and N,N-W Tamilnadu till 17/18-May.. http://ow.ly/i/CWDV
chennai - Temp. at 1:40pm was 39.0°C.. feels like 43.6°C... No strong sea breeze yet!
Category:
chennai
Monday, May 14, 2012
COLA model suggests a T.shower possible for S.Andhra, N.Tamilnadu including chennai on 15/16-May... .. http://ow.ly/i/CQ8k
Category:
chennai
Heavy T.showers to continue over S,S-W Karnataka, N.Kerala, N-W Tamilnadu till 17-May.. http://ow.ly/i/CQ8k
Super HEAT coming up for N,N-W,Central, S-central and upto S-E India .. including chennai from 16-May.. http://ow.ly/i/CP90
Category:
chennai
4pm, Heavy T.showers seen over S-central, central,N,N-W Tamilnadu, S,S-W Karnataka.. http://ow.ly/i/COiD
RT @rajugana: @weatherofindia Baroda..I could observe a nice artistic cloud formation on Sat eve..a pic http://t.co/bMhmHqxt
Already we have T.showers over S-coastal Tamilnadu .. and one popping over N.Tamilnadu.. http://ow.ly/i/CNr4
Sunday, May 13, 2012
In 24hrs, a weak circulation is possible over S,S-W Karnataka and N.Kerala... more HEAVY T.showers possible till 17-May http://ow.ly/i/CI8b
Vertical velocity is again high along S.Andhra and chennai coast.. T.shower possibility is HIGH for next 24hrs
Category:
chennai
Vertical velocity is very high over N,N-W Karnataka, Goa and coastal Karnataka .. HEAVY T.showers possible in 48hrs.. http://ow.ly/i/CI6C
Today as well, HEAVY moisture seen all over S,central Karnataka, Kerala and Tamilnadu.. http://ow.ly/i/CI6a
Saturday, May 12, 2012
chennai - temp. at 12:40pm was 36.0°C, feels like 40.8°C and Wind direction now 1pm is from S-E (Sea)
Category:
chennai
chennai - most models suggest T.showers for City on Today or before evening of Sunday.. http://ow.ly/i/CClC
Category:
chennai
Due to W.D, showers also possible for N.Rajasthan, N.MP, Delhi , Haryana, Punjab, Kashmir, himachal for next 3 days.. http://ow.ly/i/CCk8
Category:
delhi
During next 2 days, T.showers possible for N-E,S.Andhra, N,S-central Tamilnadu, chennai , N-E states .. http://ow.ly/i/CCk8
Category:
chennai
For next 24hrs, VERY heavy T.showers possible for Coastal, S,S-W Karnataka, N,central Kerala, central,E.Maharastra.. http://ow.ly/i/CCk8
Today, Vertical velocity is high along S-W,coastal Karnataka, entire Kerala and over N, N-W India.. http://ow.ly/i/CCiQ
Today, another W.D induced circulation can be seen over Punjab, Haryana and adjoining Pakistan.... http://ow.ly/i/CCi7
Heavy moisture presence seen over S,S-W Karnataka, Entire Kerala and entire Tamilnadu .. HEAVY showers expected .. http://ow.ly/i/CCi7
Today, a circulation can be seen over Jharkand and E.Madhyapradesh.. it's trough extending upto S.Tamilnadu.. http://ow.ly/i/CCi7
Friday, May 11, 2012
Bangalore to have temp. around 35 deg C and more T.showers ahead till 17-May.. http://ow.ly/i/CvaX
Category:
bangalore
chennai - after some mildly hot days till Sunday, it'll again reach 39/40/41 after 14-May
Category:
chennai
Cross EQ are expected to be strong around 18-May near S.Andaman islands .. may signal S-W monsoon over S.Andamans.. http://ow.ly/i/Cv4Y
For next 24hrs, Showers along entire W.Ghats will continue with HEAVY rain for S,S-W Karnataka and Entire kerala.. http://ow.ly/i/CuZR
7pm, Heavy T.showers ALL along W.Ghats from N-W Maharastra to S.tip of Tamilnadu.. http://ow.ly/i/CuTL
RT @jayaprakashpv: Heavy rain with thunderstorm in kumaranellur, palakkad, kerala now... http://t.co/1ZRJP4cF (6:28pm)
Category:
Kerala,
kumaranellur,
palakkad
RT @amrthraj Heavy rain and lighting with thunder weather trivandrum venjarammoodu: . http://t.co/wZFpAq7S (5:20pm)
Category:
Trivandrum,
venjarammoodu,
weather
RT @hj91: thundar is booming southern sky. pune rain fall will be there late.. (7:51pm)
Category:
Pune
International Climatic Models Turn Even More Pessimistic of a “Normal” Indian Monsoon
We are seeing possible early signals of an emerging El Niño. Large swathes of land within the country are already facing drought like conditions. Meanwhile in Peru, scientists are perplexed over the mystery death of over 3,000 dolphins. What causes marine mammals to die en masse? The US climatic agency, NOAA notes a number of possible causes, including infectious disease, parasite infestation, starvation (associated with El Niño events), pollution, injuries and algal blooms that release bio-toxins. The El Niño remains their primary suspect.
Asked whether he was worried about the El Niño playing spoil sport with the Monsoon, the India Meteorological Department (IMD) Director General LS Rathore told the media that :"Yes there are chances of El Nino phenomenon emerging in the Pacific which may not favour rains in the month of August-September. But overall monsoon is likely to be normal. El Niño is just one of the parameters being considered while forecasting".
Today a circulation can be seen over Gulf Mannar which extends upto N.Tamilnadu .. http://ow.ly/i/CrCZ
Vertical velocity near chennai and S.Andhra coast is high.. this is good for T.showers.. chennai have above 70% of Rain today
Category:
chennai
Thursday, May 10, 2012
HEAT wave to start over N-W, central & E-central India from 12-May.. and will expand to S-central India from 16-May.. http://ow.ly/i/Cl5x
6:30pm,The stretch from Delhi, S.Haryana in NORTH of India to S-Central Tamilnadu in SOUTH of India is having T.showers http://ow.ly/i/CkX7
Category:
delhi
RT @christinedelhi: Walking round Delhi roof terrace battling strong wind, waiting for rain. http://t.co/ANF4hozY (6:52pm)
Category:
delhi
'Monster sunspot' could bring solar flares and major disasters
A group of sunspots 11 times wider than the Earth turned to face our planet, raising the possibility of solar flares and auroras tonight. The sunspot cluster - shaped a little like the islands of Hawaii - is much larger than Earth. It measures 100,000 miles from end to end, while the diameter of the Earth is approximately 7,900 miles. The Sunspot Region 1476 became visible over the weekend and two coronal mass ejections (CMEs), where a portion of the sun's atmosphere breaks off, erupted on Tuesday.The CMEs blasts could arrive on Earth later today and cause moderate geomagnetic storms later and auroras in the higher latitudes, according to NOAA's Space Weather Prediction Center.The CMEs are travelling at 1.5 million miles per hour but, since they are only partially directed at Earth, they aren't expected to affect communications satellites or other equipment susceptible to space weather. (Special filters are needed for viewing the sun directly to protect the eye, notes Space.com.)
For next 48 hrs, Heavy T.showers expected for S.karnataka, W,N,N-W,central Tamilnadu, N,central Kerala .. http://ow.ly/i/Ck14
RADAR shows super T.shower is now (4:30pm) crossing Kanchipuram town .. http://ow.ly/i/CjKX >> No chance of Rain for chennai
Category:
chennai
4pm, Lots of T.showers seen over stretch from N.Rajasthan to S.central Tamilnadu .. http://ow.ly/i/CjHX
RT @rajugana: Baroda 8.50am; Clear sky, Sunny,and breezy morning. Ytday 39C, TClould in the eve, but no rain. a pic http://t.co/yBC5bmBo
Wednesday, May 09, 2012
Chennai:
Thursday/Friday: very humid and partly cloudy. Thundery developments in evening with 20%* chance of rain. However, nights will be unbearable at 28/29c next few days.
Saturday: 60%* chances of rain.
For All India Weather and other cities see vagaries
The circulation over E.MP will drop a trough extending to S.karnataka, S.Andhra, N.Tamilnadu and will last till 13-May.. http://ow.ly/i/Cagr
W.D induced T.showers will pop over Rajasthan, Punjab, Haryana, Delhi, Kashmir, Himachal from today till 14-May.. http://ow.ly/i/Cafh
T.showers are going to be strong over S,S-W Karnataka, N,central Tamilnadu, S.Andhra.. from today till 14-May.. http://ow.ly/i/CaeM
For next 48 hrs, scattered T.showers possible for Central,E. Maharastra, N,N-E.Andhra, Entire Karnataka.. http://ow.ly/i/Caeg
Monsoon Watch-Seasonal Low parameter:
With the heat factor still lacking absolute "full strength", in the Northern regions, the Seasonal Low core in the Thar Desert is now somewhat "unsteady", with a core pressure at 1002 mb, and requires to spread more westwards, rather than east. This (pulling Eastwards) is happening due to M1.
The heat waves are still missing, with the minimums still showing vast regions in the below normal range. By this time each year, vagaries normally charts the "above 30c" minimums. But this year as yet, forget 30s, we are still barely reaching 25s in the night, with the odd one out in the NW plummeting to below 20c.
And the days ? 45c is just about getting its foothold!
Other Parameters and complete article at Vagaries
RT @paarth_: Getting drenched in the rain! In the caves of Wayanad, Kerala and having a good time with my friends... http://t.co/70QmG8j6
Tuesday, May 08, 2012
8:30pm, Massive T.showers over Central,E Rajasthan, W.Maharastra, S.Karnataka, N-W,W,S-central Tamilnadu.. http://ow.ly/i/C4wq
Bangalore - some heavy T.showers for city from today till 13-May.. http://ow.ly/i/C1N2
Category:
bangalore
Heavy and widespread T.showers forecast for S.karnataka, N,N-W Tamilnadu, and into N.Kerala from tomorrow.. http://ow.ly/i/C1LF
Today a weak circulation can be seen over Indian ocean area just South of Kanyakumari .. http://ow.ly/i/C1JK
Monday, May 07, 2012
Strong trough is expected to form from Bihar to S.Karnataka on 9-May... moisture feed to come from W.D to S.peninsula. http://ow.ly/i/BVrj
S.Peninsula may have less HOT weather from 10-May.. most of the HOT conditions will be over N,N-W of India.. http://ow.ly/i/BURq
Latest low level wind analysis show that cross equatorial winds are reaching Somalia coast and Somalia Low Level Jet .. http://ow.ly/i/BUDr
6:30pm, Heavy T.showers seen over East,S-E Rajasthan, W,N-W Madhyapradesh and over S. Tamilnadu ... http://ow.ly/i/BUvs
RT @rajugana: @weatherofindia; Aftermath of Evening showers at Gods own Country..dark clouds & green everywhere. a pic http://t.co/O9BZ27nO
Heavy rain forecast for S.Karnataka,N-W Tamilnadu and N.Kerala from 9-May to 13-May.. http://ow.ly/i/BT6x
chennai - city had a mild temp. till 11:30am and after that it's Hot.. temp. at 3:10pm was 36.0°C, with light breeze from South
Category:
chennai
2:30pm, as expected.. T.showers are popping up over W.Madhyapradesh and Central,E.Rajasthan.. http://ow.ly/i/BT4k
chennai - this is the latest (7am) satellite shot of the Thunder storm over Bay near city's coast.. http://ow.ly/i/BRpl
Category:
chennai
RT @ssrivatsan: Dark clouds and heavy winds. Hope it rains. Chennai. http://t.co/rAzFQ4Qi (7:36am)
Category:
chennai
chennai - a huge T.shower is seen over Bay just 20km N-E of City.. and approaching !!.. http://ow.ly/i/BRnT
Category:
chennai
Sunday, May 06, 2012
A Western disturbance, M-1, now covering Northern regions of India and Pakistan is expected to linger on till Friday. Northern Pakistan, and Northern Indian regions will continue to get pockets of Thundershowers spread out widely from North Pakistan thru Northern Indian states of Punjab,Haryana, Delhi, West U.P. and Northern M.P. Nepal too would recieve showers Tuesday thru Thursday.
Interestingly, an induced low, basically an off shoot of M-1, will form on Monday and bring rainfall in many regions of Rajasthan, MP, Interior Maharashtra from Tuesday thru Friday.
This is a result of the Easterly 200 hpa jet streams stooping down far to the South.
if further interested, see map on Vagaries.
chennai - may record below 40 deg C temp from Monday till 10-May.. http://ow.ly/i/BNjh
Category:
chennai
Lots of T.showers expected to break open over delhi, N,N-W, Central India from Monday to 12-May, Will peak from 8-May.. http://ow.ly/i/BNiF
Category:
delhi
chennai - at 12:10pm, temp. was 36.0°C ... 3 deg C below than yesterday's temp at this time.
Category:
chennai
A Super HEAT wave to start over N,N-W, central, E-central, S-central India from 10-May... http://ow.ly/i/BNgc
Moisture has almost dried out over and along S.kerala coast .. it'll be back from 11-May... http://ow.ly/i/BNfS
Saturday, May 05, 2012
5:30pm, Heavy T.showers seen over S.central Tamilnadu, N-E Andhra, Jharkand, W,S-W Madhyapradesh, S,S-E. Rajasthan .. http://ow.ly/i/BIJI
Today, E.Bay circulation is strong and very near to S.Myanmar coast .. Heavy rains witnessed .. http://ow.ly/i/BIJI
Friday, May 04, 2012
Continuous SUPER heat for N-W, N India to commence from 6-May and HOLD for another 20 days.. http://ow.ly/i/BzT5
T.showers expected to continue over E.Madhyapradesh, Jharkand, Chatisgarh, S.Bengal, Orissa and into N,N-E Andhra.. http://ow.ly/i/BzEB
A Low level circulation is present over Orissa, Chatisgarh, E.Maharastra, E.MP.. http://ow.ly/i/BzCD
Central Arabian sea will host a Anti-cyclone from 7-May.. and it'll slowly deepen and move towards S-W India coast.. http://ow.ly/i/BzAj
The cross equatorial winds pushing into S,S-E Bay will continue and likely to get strong after 9-May.. http://ow.ly/i/Bzxw
5pm, T.showers seen over S-W Kashmir, Himachal, E.rajasthan, Bihar, Jharkand, Coastal,N-E. Orissa, central,N-W Tamilnadu http://ow.ly/i/BzuL
Area over Bay just East of Port blair & very near to Myanmar coast is getting ready to host a strong circulation.. http://ow.ly/i/Bz6e
Polar Bear Extinction: Deconconstructing the Scientific Hoax;
In an age in which emotional narratives often trump facts, the polar bear quickly became the icon of the climate alarmist movement. The frame of a cuddly polar bear clinging on to a swiftly melting tiny ice floe tended to immediately rake up a flurry of emotions all sympathetic for a creature, apparently portrayed as helpless to starve off the danger of its imminent drowning.Al Gore, former US Vice President, used the above frame in his controversial documentary “The Inconvenient Truth”. All these publicity spurred the frame going viral over the internet and succeeding in recruiting tens of thousands to the climate change cause. It however also spawned an ever increasing band of climate critics. Science, the renowned international scientific journal selected the frame in its editorial “Climate Change and the Integrity of Science” to counter this growing worldwide trend of “climate scepticism”:"We are deeply disturbed by the recent escalation of political assaults on scientists in general and on climate scientists in particular. All citizens should understand some basic scientific facts."But they didn’t factor into their calculations, an encounter with my pal, James Delingpole of The Telegraph, a leading newspaper in the UK. James’ brilliant investigative work exposed the frame as a photo-shopped graphic! Instead of helping to refute the allegation, this frame ended up confirming that the integrity of climate alarmist scientists was indeed suspect. Science consequently had to swallow its pride and render the following editorial correction:"Due to an editorial error, the original image associated with this Letter was not a photograph but a collage.Read more: http://devconsultancygroup.blogspot.in/2012/05/polar-bear-extinction-deconconstructing.html
chennai - will have sea breeze from E-S-E after 2:30pm .. until then no respite !!
Category:
chennai
chennai - temp. at 11:40am was 38.0°C and feels like 43.4°C .. another 40 C on cards !
Category:
chennai
chennai - Day before Agni Natchatiram, city hits 40 on 3-May .. http://ow.ly/aH54X
Category:
chennai
Thursday, May 03, 2012
Today, the cross equatorial winds is strong and reaching well into Bay.. meanwhile the winds are reaching Somalia.. http://ow.ly/i/Bplt
3:30pm, Showers seen over S.Kashmir, Himachal and upper reaches of Uttarakand.. this may be the last from this W.D.. http://ow.ly/i/Bpjv
3:30pm, T.cells have popped over N-E. Andhra, Coastal Orissa, S-W Bengal, Jharkand, S.Bihar, central Tamilnadu. http://ow.ly/i/BpfP
CAPE factor is going to be high along S.Kerala for next 2 days.. this'll produce strong T.showers before 6-May.. http://ow.ly/i/Bpe4
Heavy scattered T.showers forecast for Bengal, Bangladesh, into Jharkand and N-E Orissa from today till 6-May.. http://ow.ly/i/BpcB
Moisture concentration is expected to be high along S.kerala for next 2 days.. Isolated T.showers expected till 5-May. http://ow.ly/i/Bpbn
Today a strong circulation can be seen over Chatisgarh, Orissa and S.Jharkand .. T.showers likely in these zones.. http://ow.ly/i/Bpa9
chennai - today touched a max of 37.6°C (12:02pm)... it may reach 40 C before 6-May and then reduce for next 4 days.. http://ow.ly/i/Bp9H
Category:
chennai
Wednesday, May 02, 2012
Scattered T.showers can be seen over N. Tamilnadu.. and one is visible over W-S-W of chennai at around 75km from city.. http://ow.ly/i/Bh2o
Category:
chennai
A good seasonal LOW is expected to form and deepen over N,N-W India and into Pakistan only after 7-May.. http://ow.ly/i/BgV2
Monsoon Watch - 4
This article is reproduced from http://rajesh26.blogspot.in/
Forecasting Methods adopted for the Indian Monsoons:
Gowariker(1989) developed parametric and multiple power regression (MPR) models with 15 predictors for LRF of AISMR, which were later modified in 1991 to include 16 predictor parameters. The parametric model is qualitative and indicates the likelihood of the monsoon rainfall to be excess or deficient.
Thapliyal (1990) evaluated the relative performance of multiple regression, and Navone and Ceccatto (1994) have used 'feed-forward' neural network technique for the prediction of Indian monsoon rainfall with two predictors (500 hPa ridge location and Darwin SLP tendency from January to April).
The results of a recent work by Krishna Kumar (1997) indicate that a single component accounts for about half of the total variance in the predictors
Most of the studies on LRF of Indian monsoon rainfall were based on empirical or statistical techniques till 2010.
IITM, Pune has recently implemented the state-of-the-art coupled climate model, the Coupled Forecasting System (CFS) developed by the National Centers for Environmental Prediction (NCEP), USA. These statistical techniques range from simple correlation analysis to advanced procedures.
I still have faith, and believe in the "Gowariker Method" with 16 parameters. The results of this old but proven method has been successful. For Vagaries' forecast and analysis made in the "Arrival and quantum Monsoon Watch" series, I combine a few of them alongwith Dynamical models for a personal analysis and estimate.
15 initial parameters from the months March, April and May are used to analysis and forecast the simulation of Indian monsoon rainfall during June to October. These initial conditions were carefully selected by experts to span the evolution of both the atmosphere and ocean.
Calculating the amount of rainfall, region wise, is of utmost importance, as SWM contributesto almost 80% of the annual total rainfall over India.
The performance of Vagaries' Monsoon Watch Quantum analysis is evaluated for the amount of summer monsoon rainfall over Indian monsoon region during June to SWM withdrawal.
The 500 hpa parameter is of importance in April. The mean latitudinal location of the 500 hPa ridge along 75°E in April over India, first identified by Banerjee (1978), is considered to be one of the most important predictors. The mid-tropospheric anticyclone over southern India migrates from 11.5°N in January to its northernmost position of 28.5°N during July. From October, the ridge starts shifting back southward.
A more Northward location indicates better performance of the monsoon and vice versa. It also showed that the negative correlation of the March ridge was more dominant with the monsoon rainfall of the peninsular India, while the positive correlation of the April ridge was more dominant with the monsoon rainfall of Northern India.
ENSO factor in arriving at the rainfall amount is also of importance. The interface is the sea surface: that is where the transfers of water (evaporation/precipitation) and momentum occur. An accurate coupling of the fast atmosphere to the slow ocean is essential to simulate the ENSO, which in turn can simulate the interannual variability of Indian monsoon. Unfortunately, getting an accurate, or near to accurate forecast of the ENSO for the next 2 months is difficult, with no guarantee of accuracy or performance surety.
We see neutral conditions now. But, there is a possibility of a mild El-Nino event occuring as early as June/July. Now, this would result in "severe" break Monsoon condition in July. That is the last thing we want. But I would not endorse the event as yet. I would give it a 50-50 chance.
Limited pulses from the Eastern Pacific area, that is S.China sea, would mean lesser depressions and systems originating from the Bay.
'In Situ" systems and systems from the Far east would contribute to the rainfall to the East Coast thru Central India and into Gujarat and even into Sindh (Pakistan).
El-Nino, even a mild one, would sort of restrict these pulses, and in fact encourage WDs into coming down South, more South than normal.
But, for this, we would have to hope and pray for the Neutral ENSO conditions (presently on) to prevail and hang on till September. Again, a 50-50 chance for Neutral conditions.
Regarding the IOD parameter, recent forecasts from a few coupled models suggest the possibility of development of a weak negative Indian Ocean Dipole event after July 2012.
1. Seasonal Low: Indicator: -ve
The heat is about to pick up in the Rajasthan/Sindh regions from the 3rd/4th of May, so good chance for the seasonal low to form and establish itself, at least by the 10th.Today the pressure at MSL is 1000 mb, with the core at 1000 mb.
The sub Continent hot spots have just about touched the 44c mark (it is already Late. Refer MW-1) and should head for the 50c mark by around 16th May.
2. ITCZ: Indicator: Normal
As it is by the 10th, that we should have the ITCZ nearing the Equator. Only then would the Bay branch of the SWM could commence in the Southern Bay by the 15th of May.
3. Jet Streams: Indicator:-ve
These are streaming away in a Westerly direction above the 25N line. They are just about getting Easterly around 5N. Needs a rapid change now.
4. Cross Equatorial Winds: Indicator: Normal in Bay Branch. -ve in Arabian Sea Branch
Well established in the Bay region. SW winds, with sufficient speed hitting the S.Myanmar coasts, covering the Bay Islands with 20-30 knts, and could hearald the arrival of the SWM on time there.
Arabian Sea winds are now picking up, and rubbing the Somali coast at sufficient speed in getting the "Somali Current" established. The SST off the Somali Coast is 22c, While the required SST in First week June is 17/18c. (Required to form masses of Monsoon clouds in the warm central Arabian Sea).
Very Briefly, explaining the Factors considered for Seasonal Forecast:
If we take into account, that the ENSO will be Neutral, but "leaning" towards a weakish El-Nino phase by, say, end August, then:
a) There will be a drop in the systems originating from the Bay. If at all there will be weak depressions just about reaching Central India and fizzling out.
Hence could result in rainfall deficit for the NW regions, including lower Sindh in Pakistan. Central India and adjoining areas will be well covered.
b) In such a scenario, even the 200 hps jet streams would bend slightly Southwards, and the "low" at that level will be dislodged. could bring in the odd WD even in July. Could bring some heavy rainfall to Upper Pakistan regions. Hence, rainfall could be normal/excess in rest Northern Pakistan and Kashmir. Though technically they will be Monsoon rains.
c) Due to systems reluctant to track southwards, we may see lesser rains in the Southern Peninsula regions. Even the support to the west coast (South of Mumbai)may be lesser than normal. Hence, rain shadow regions in TN and interior Karnataka may be slightly deficient. Lesser gradient along the West coast will show lower rainfall in Kerala, specially in June.
d) Break monsoon situations, and winds bringing in moisture from the Bay (diverted to the NW directions) will result in excessive rainfall this season in Nepal, more so the Eastern regions. NE states of India will get continuous feeding from the Bay. (Cherrapunji seems the likely candidate for the poll).
This is a very early estimates based absolutely on the situation as it shows and stands today.
Forecasting Methods adopted for the Indian Monsoons:
Gowariker(1989) developed parametric and multiple power regression (MPR) models with 15 predictors for LRF of AISMR, which were later modified in 1991 to include 16 predictor parameters. The parametric model is qualitative and indicates the likelihood of the monsoon rainfall to be excess or deficient.
Thapliyal (1990) evaluated the relative performance of multiple regression, and Navone and Ceccatto (1994) have used 'feed-forward' neural network technique for the prediction of Indian monsoon rainfall with two predictors (500 hPa ridge location and Darwin SLP tendency from January to April).
The results of a recent work by Krishna Kumar (1997) indicate that a single component accounts for about half of the total variance in the predictors
Most of the studies on LRF of Indian monsoon rainfall were based on empirical or statistical techniques till 2010.
IITM, Pune has recently implemented the state-of-the-art coupled climate model, the Coupled Forecasting System (CFS) developed by the National Centers for Environmental Prediction (NCEP), USA. These statistical techniques range from simple correlation analysis to advanced procedures.
I still have faith, and believe in the "Gowariker Method" with 16 parameters. The results of this old but proven method has been successful. For Vagaries' forecast and analysis made in the "Arrival and quantum Monsoon Watch" series, I combine a few of them alongwith Dynamical models for a personal analysis and estimate.
15 initial parameters from the months March, April and May are used to analysis and forecast the simulation of Indian monsoon rainfall during June to October. These initial conditions were carefully selected by experts to span the evolution of both the atmosphere and ocean.
Calculating the amount of rainfall, region wise, is of utmost importance, as SWM contributesto almost 80% of the annual total rainfall over India.
The performance of Vagaries' Monsoon Watch Quantum analysis is evaluated for the amount of summer monsoon rainfall over Indian monsoon region during June to SWM withdrawal.
The 500 hpa parameter is of importance in April. The mean latitudinal location of the 500 hPa ridge along 75°E in April over India, first identified by Banerjee (1978), is considered to be one of the most important predictors. The mid-tropospheric anticyclone over southern India migrates from 11.5°N in January to its northernmost position of 28.5°N during July. From October, the ridge starts shifting back southward.
A more Northward location indicates better performance of the monsoon and vice versa. It also showed that the negative correlation of the March ridge was more dominant with the monsoon rainfall of the peninsular India, while the positive correlation of the April ridge was more dominant with the monsoon rainfall of Northern India.
ENSO factor in arriving at the rainfall amount is also of importance. The interface is the sea surface: that is where the transfers of water (evaporation/precipitation) and momentum occur. An accurate coupling of the fast atmosphere to the slow ocean is essential to simulate the ENSO, which in turn can simulate the interannual variability of Indian monsoon. Unfortunately, getting an accurate, or near to accurate forecast of the ENSO for the next 2 months is difficult, with no guarantee of accuracy or performance surety.
We see neutral conditions now. But, there is a possibility of a mild El-Nino event occuring as early as June/July. Now, this would result in "severe" break Monsoon condition in July. That is the last thing we want. But I would not endorse the event as yet. I would give it a 50-50 chance.
Limited pulses from the Eastern Pacific area, that is S.China sea, would mean lesser depressions and systems originating from the Bay.
'In Situ" systems and systems from the Far east would contribute to the rainfall to the East Coast thru Central India and into Gujarat and even into Sindh (Pakistan).
El-Nino, even a mild one, would sort of restrict these pulses, and in fact encourage WDs into coming down South, more South than normal.
But, for this, we would have to hope and pray for the Neutral ENSO conditions (presently on) to prevail and hang on till September. Again, a 50-50 chance for Neutral conditions.
Regarding the IOD parameter, recent forecasts from a few coupled models suggest the possibility of development of a weak negative Indian Ocean Dipole event after July 2012.
1. Seasonal Low: Indicator: -ve
The heat is about to pick up in the Rajasthan/Sindh regions from the 3rd/4th of May, so good chance for the seasonal low to form and establish itself, at least by the 10th.Today the pressure at MSL is 1000 mb, with the core at 1000 mb.
The sub Continent hot spots have just about touched the 44c mark (it is already Late. Refer MW-1) and should head for the 50c mark by around 16th May.
As it is by the 10th, that we should have the ITCZ nearing the Equator. Only then would the Bay branch of the SWM could commence in the Southern Bay by the 15th of May.
3. Jet Streams: Indicator:-ve
These are streaming away in a Westerly direction above the 25N line. They are just about getting Easterly around 5N. Needs a rapid change now.
4. Cross Equatorial Winds: Indicator: Normal in Bay Branch. -ve in Arabian Sea Branch
Well established in the Bay region. SW winds, with sufficient speed hitting the S.Myanmar coasts, covering the Bay Islands with 20-30 knts, and could hearald the arrival of the SWM on time there.
Arabian Sea winds are now picking up, and rubbing the Somali coast at sufficient speed in getting the "Somali Current" established. The SST off the Somali Coast is 22c, While the required SST in First week June is 17/18c. (Required to form masses of Monsoon clouds in the warm central Arabian Sea).
Very Briefly, explaining the Factors considered for Seasonal Forecast:
If we take into account, that the ENSO will be Neutral, but "leaning" towards a weakish El-Nino phase by, say, end August, then:
a) There will be a drop in the systems originating from the Bay. If at all there will be weak depressions just about reaching Central India and fizzling out.
Hence could result in rainfall deficit for the NW regions, including lower Sindh in Pakistan. Central India and adjoining areas will be well covered.
b) In such a scenario, even the 200 hps jet streams would bend slightly Southwards, and the "low" at that level will be dislodged. could bring in the odd WD even in July. Could bring some heavy rainfall to Upper Pakistan regions. Hence, rainfall could be normal/excess in rest Northern Pakistan and Kashmir. Though technically they will be Monsoon rains.
c) Due to systems reluctant to track southwards, we may see lesser rains in the Southern Peninsula regions. Even the support to the west coast (South of Mumbai)may be lesser than normal. Hence, rain shadow regions in TN and interior Karnataka may be slightly deficient. Lesser gradient along the West coast will show lower rainfall in Kerala, specially in June.
d) Break monsoon situations, and winds bringing in moisture from the Bay (diverted to the NW directions) will result in excessive rainfall this season in Nepal, more so the Eastern regions. NE states of India will get continuous feeding from the Bay. (Cherrapunji seems the likely candidate for the poll).
This is a very early estimates based absolutely on the situation as it shows and stands today.
Category:
Articles,
South West Monsoon
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