Wednesday, October 31, 2007

Cloudy & Clear

Yesterday (30-oct-2007) it was a cold and cloudy day. In the morning there was a chance of rain, but afternoon the clouds became high.

Now-today (31-oct-2007) it's clear skies, Humidity is high... This may be signs of things to come in coming 3 or 4 days.

As of now the earlier prediction for another LOW over bay during 1-Nov-2007 is nulled.
Let's see when ....
Take a look at the rain forecast for next 24 hrs

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Tuesday, October 30, 2007

Tropical Cyclone 05A

It took a few days longer than had at first been forecast, but has happened--Tropical Cyclone 05A.
As seen on the latest infrared imagery...


...that is 05A along the 65th (East) meridian and the 10th (north) parallel. At the upper left the picture, there seems to be a name given for 05A: Bayarab.

The JTWC have rated 05A as a 40-knot (75-kph) tropical storm (as of 1200 hours GMT) with sluggish movement towards the west. The cyclone spent the first part of its life (which began Sunday) whirling in place.

Now that we have a defined weather system in TC 05A, the numerical forecasts have begin to close ranks about a consensus: that cyclone will track towards the west and northwest through the week. By the end of the week, 05A could land on the southeast mainland of Arabia, although a strike upon the island of Socotra (off NE Somalia) could happen Friday.

So a question remains open: how strong will 05A get? a hurricane? I do believe there is `room to grow` for 05A. It does have 28-29 degree water to work with. Then, too, are questions related to impact upon Arabia (southern Oman, eastern Yemen, anywhere else). Assuming a depression or tropical storm, it would go without saying that local excessive rain would be a threat. And scattered desert cloudbursts could arise from 05A`s moisture far inland.

--Recall (those who read regularly) the mention of a (elusive) Bay of Bengal cyclone. Thus far, no such thing is immanent. As of this writing, there is broad low pressure east of southern India, but not any hint of cyclone potential.

The Bay low has made for some torrential, flooding falls of rain over South East India. Foremost of the instances that I found on data was that of Nellore, southern Andhra Pradesh. Here, rainfall Sunday to Monday evening was 14.9 inches, or 377 mm. Earlier late-week rains boosted city rainfall to 18 inches. At Chennai, where rains of the North East Monsoon were slow to start, a weekend outburst left 171 mm, or 6.8 inches. This brought the city roughly two-thirds of its normal October rainfall.

Monday, October 29, 2007

After that depression, what next?

Chennai recorded 12cm of rain in past 24 hrs, which is good.
So the numerical forecast for 27 & 28th october was correct.
Here is another numeric forecast for 31st october thru 1st november.... signs of another BAY LOW... Lets see

Proved wrong

Just go thru the REPORT & FORECAST published in IMD website (below), and this report would have been published in all local newspapers and even announced in RADIO & TV. Based on these report the Tamilnadu Govenment has announce FULL holiday for schools & colleges on 29-Oct-2007.

GOVERNMENT OF INDIA
INDIA METEOROLOGICAL DEPARTMENT
REGIONAL METEOROLOGICAL CENTRE, 6, COLLEGE ROAD, CHENNAI - 600 006.
REGIONAL DAILY WEATHER REPORT FOR TAMILNADU, PUDUCHERRY, ANDHRAPRADESH, KARNATAKA, KERALA AND LAKSHADWEEP

SUNDAY, 28TH OCTOBER 2007 / 6TH KARTIKA 1929 (SAKA)

SUMMARY OF OBSERVATIONS RECORDED AT 0830 HRS IST:
Yesterday's low pressure area over Southeast and adjoining Southwest Bay concentrated into a depression and lies centered at 28/0830 IST over Southwest Bay at about 480 kilometres Southeast of Chennai. It is likely to intensify further and move in a West-Northwesterly direction and cross the coast between Puducherry and Kavali by tomorrow evening the 29th October 2007.

North East monsoon has been active over Tamilnadu and Kerala.


But what happened is.... The DEPRESSION crossed tamilnadu coast YESTERDAY (28-Oct-2007) itself, not on the date anounced by IMD (29-Oct-2007, Evening).
We know the reason for this sudden generation of depression and quick crossing into land is due to the tropical cyclone development over the Arabian Sea.

Lots more to come.
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Sunday, October 28, 2007

Another day to remember

Non-stop light-medium-heavy rain thru the day.

For past 24hrs rain record stands 101.8 MM at 7:09 PM

Previously a day to remember was 27-Oct-2005, 423 MM.

Rain still continues as i write... lets see when it stops..
Take a look at latest Satellite image and Forecast (generated on 27-oct-2007)

Latest Infrared INSAT pic




http://cimss.ssec.wisc.edu/tropic/real-time/indian/images/xxirmet5n.GIF

Brightest spots will have good rain.

Latest Lightning events

Joint typhoon warning center

Have a look at "Joint Typhoon Warning Center" maintained by US Navy.
Lots of info
https://metocph.nmci.navy.mil/jtwc.php

and

http://www.nrlmry.navy.mil/tc_pages/tc_home.html

At last a Depression

Yes, at last. There is a tropical depression over the mid-southern Arabian Sea. The JTWC have raised an alert to the potential for a tropical cyclone.

The GFS numerical forecast has a strong low (likely a cyclone) nearing the eastern shore of Yemen on the 1st and 2nd of November. This after a brush with Socotra, east of northern Somalia.

While the story remains rather the same (inconsistency in numerical forecasts=low confidence in their solutions), we are now closer to having a tropical cyclone.

Meanwhile, a low is now east of southern India. This low is forecast to deepen a little before drifting ashore in SE India. Such behavior would bring heavy falls of rain, perhaps to Chennai, which is far behind schedule in getting its fall (North East Monsoon) rains.

The idea of a cyclone aiming for the northern west coast (Gujarat) of India has been dropped by the newest forecasts. Should not be any surprise

Continuing rain

Here is the latest INSAT


From yesterday (27-oct-2007) afternoon... the rain was intermitent and Now (28-oct-2007,Sunday) it's raining non-stop.

Rain intensity is drizzle to medium, but non-stop.

As of now past 24 hrs rain in Chennai (28-Oct-2007, 12:34PM) is 65.6mm