Monday, April 19, 2010

Chennai - is slowly inching towards 40 deg C mark, on 18-Apr it was .. 37 deg C.
Most tamilnadu towns are nearing 40 and some have crossed it, Salem=40, Tiruttani=41 and Vellore = 41 deg C on 18-Apr.
On 18-Apr, Adilabad recorded the highest maximum temperature of 46 degree Celsius in south India.
Rainfall over south peninsula on 18-Apr, Vadakara (Kozhikode dt) and Tirumangalam (Madurai dt) 6 CM
6pm, Thunder cells over N-W U.P, S.Orissa, most of N-E states, N-W & N Tamilnadu ..
Chennai - Dead clouds of North Tamilnadu thunder cell is over us now 6:30pm. ... More showers over WEst, North-west and over North Tamilnadu now.. 5:30pm
5pm, Showers over Himachal, Kashmir, Nepal and South Orissa ..
Isolated thunder cells over North Tamilnadu seems to be dying... Less chance of reaching Chennai. We'll keep tracking for another 2 hrs.
Westerly system to bring down mercury in stages ...
3:30pm, Showers along South extreme & N.Andhra and over North Tamilnadu ..
Isolated thundersquall may occur over West Bengal and Sikkim during next 24 hours.
Isolated heavy rainfall with thunder squalls would occur over Arunachal Pradesh, Assam and Meghalaya during next 48 hours.
On 18-Apr, highest maximum temperature of 46.5°C was recorded at Daltonganj (Jharkhand)
Severe heat wave conditions are prevailing over many parts of Haryana, Chandigarh, Delhi, some parts of north Rajasthan, Jharkhand.
2:30pm, Isolated showers over Orissa and Heavy over some N-E states ..
Mumbai - Water "Scare-city " ...
Chennai - Current dry phase is 3rd longest since 2000 ..
Heavy rain over North East states...from 1-Mar-10 to 16-Apr-10 ...
India Monsoon May Arrive on Time ...
volcanic ash problem in Europe is affecting the World Cup T20 schedule in West Indies..
RT @khup_joe: @weatherofindia it's raining heavily in haflong, Assam plus the thunder. (1pm)
1:30pm, Already we have isolated thunder cells over Orissa ..

Heavy rain over North East states...from 1-Mar-10 to 16-Apr-10

From 01.03.2010 to 16.04.2010

Cherrapunji 185 cm 1377% above normal
Silchar 55 cm 242% above normal
Passighat 47 cm 256% above normal
Itanagar 45 cm N/A% above normal
Dibrugarh 44 cm 235% above normal

Posted by Mr. Pradeep John

Chennai - DRY phase

Current dry phase is 3rd longest since 2000

We have had 100 days without rain*. Last rain was on 8th Jan.

18.2.07 15.6.07 117 days
2.2.02 16.5.02 103
8.1.10 18.4.10 100
6.1.01 14.4.01 98
27.1.04 7.4.04 71

Posted by Mr. Pradeep John

More Thunder storms this year ?? !!

Pre monsoon TS is common for this period for the stations located along the foot hills of western ghat [eastern slope. This has been known to our ancient Tamil too and during this period Vaigai used to get run off from the Premonsoon TS and Chitrai Festival is based on this pre monsoon thunder showers only. But on the other hand frequent pre monsoon TS in entire Kerala side is less common. Norwesters which claimed more than 80 lives in North Jharkhan, North Bihar,north WB was a cluster of thunder cell for form as a Line squall. But I am sure that the weather phenomenon is NOT a Tornada. Instead it may be a Low Level Jet. Locating it in weather maps may not be possible. But DWR can locate the clusters. [Kolcotta DWR]The phenomenon occurred around 2217 hrs IST and last till next day morning sun rise.

Posted by Mr. Anonymous

Volcanic ash threat !!

The volcano is pumping ash to a height of 6.0 km. Ice land is between 64.0 Deg N latitude to 66.5 Deg N Latitude. The mid latitude upper westerly wind take the ash towards east over North Europe and Asia and it will cover the globe. The lower level winds drifts the plume toward SEly. Air crafts flying at this altitude will be badly hit by ash and it may prove hazardous to aircraft engines.To avoid this,they may fly over the level [or below the level]where the atmosphere is NOT affected by the plume.
This will bring impact on weather too.

Posted by Mr. Anonymous
El Niño Fading ..

El Niño Fading

Posted on April 9, 2010 at 9:50 PM
Our current El Nino is 10 months old and is showing signs of fading. El Nino reached its peak in late December, when water temperatures along the equator in the Pacific Ocean were running about 1.8 degrees C above average. Temperatures that warm help to shift weather patterns across the planet. For Texas, it meant above normal rainfall from late fall through the winter. This week, temperatures in that same region are running only about 1.0 degree C above average...considered a "moderate" El Nino. That, combined with the fact that the later into spring we get, the less of an impact El Nino has on Central Texas, means that I expect just slightly above average precipitation in April, with temperatures near normal, or just slightly below normal. By May, look for Austin's weather to be about average. Luckily, May is our wettest month of the year, so there's still some hope of filling up Lake Buchanan. Buchanan's low level (73% full as of 4/9) is one of the last remaining signs of last year's drought. I believe that we're in for a typical Austin summer...warm and dry...but, not as hot as last year when we had 68 days of triple-digit heat!!
Some long range models hint that a weak La Nina may return late this year. La Nina was responsible for our record-breaking drought. But, that's far from certain, as climate models have some trouble determining the onset of a La Nina.

Westerly system to bring down mercury in stages

An incoming western disturbance has expectedly helped ratchet up the ambient mercury level in north-west India even as heat weave conditions prevailed over large stretches in the region.

On Sunday, the western disturbance sat parked over north Pakistan and adjoining Jammu and Kashmir, an update from India Meteorological Department (IMD) said. It is expected to get a move to the east, as is normal.


Western disturbances tend to initially pump up mercury due to the presence of the ‘heat engine' in front and rising motion of air, which produces cloudiness and precipitation in later stages.

In this manner, the incoming system would help bring down the temperatures for a while in the affected region but would leave it to face the wrath of the April sun while moving east and sets up weather at the next outpost, to the east and northeast India.

Meanwhile, the IMD expected no significant change in maximum temperatures over plains of northwest and adjoining central India during the two days.

Severe heat wave conditions have been prevailing over most parts of Rajasthan, Haryana, Delhi, Punjab, Himachal Pradesh and parts of Uttarakhand, the Jammu division of Jammu and Kashmir and isolated pockets of north Chhattisgarh, Jharkhand and Madhya Pradesh during the 24 hours ending Sunday morning.


Heat wave conditions are also prevailing over parts of Uttar Pradesh, Vidarbha, Gujarat and remaining parts of Madhya Pradesh, Jharkhand and north Chhattisgarh.

Under these conditions, the maximum temperature shot up to a new high of 47 deg Celsius at Ganganagar in Rajasthan.

A warning issued by the IMD said that heat wave conditions would continue over Rajasthan, Haryana, Delhi, Punjab, north Chhattisgarh and Madhya Pradesh during the next two days at least.

A fall in maximum temperatures can be expected over north-west, central and east India from Friday tanks to cloudiness, moisture incursion and thundershower activity associated with the westerly activity.

But it may not last for too long, according to international weather models.

The incoming western disturbance would be suitably endowed to stay in the reckoning and dictate weather over the western Himalayas over the next four days.


Satellite imageries revealed the presence of convective clouds (weather-setting) over parts of Sikkim and Arunachal Pradesh.

Low to medium clouds (partly clouded conditions) were witnessed over parts of Punjab, Haryana and the rest of the Northeastern States.

Partly clouded conditions were also witnessed over peninsular India, south-east Arabian Sea and south Andaman Sea, many of which have witnessed thunderstorm and rain activity over the past few days.

An IMD forecast until Wednesday spoke about the possibility of scattered to fairly widespread rain or thundershowers over the Northeastern States, Jammu and Kashmir and Himachal Pradesh.

Isolated rain or thundershowers are likely over Uttarakhand in the north-west and sub-Himalayan West Bengal and Sikkim in the north-east.

A warning for the next two days said that isolated heavy rainfall with thunder squall may occur over Arunachal Pradesh, Assam and Meghalaya.


Towards the south, isolated to scattered rain or thundershowers would occur over Konkan and Goa, Madhya Maharashtra, Karnataka, Kerala and Tamil Nadu.

The weather in the south is going to be overseen by two systems – one, a trough running down from east Uttar Pradesh to south Tamil Nadu across east Madhya Pradesh, Vidarbha, Andhra Pradesh with an embedded cyclonic circulation over east Uttar Pradesh.

The other is a cyclonic circulation over Lakshadweep area, the IMD said.
India heat wave kills 80, hurts wheat crop ...
Monsoon may start erratically ..
Mumbai - Looks like another sultry day here in Mumbai.Minimum was 27, and morning sees sky with 25% low clouds.
Chennai - Having clear skies with some minor low cloud formation. Moderate humidity and with Good breeze from South-East.
Chennai - A clear day here... temp will touch 36.5 and go down slowly after 3pm. Humidity will be 60% till 3pm and rise gradually.
Showers over N-E states continue well into morning, while the Western Disturbance clears over Kashmir ..
Overnight, Heavy showers along coastal Karnataka, Nilgiris, N.Bihar, N.Bangladesh and into most of N-E states.