Sunday, August 2, 2015

STH Stormwatch : Last update on storm for 02Aug2015


1.In the absence of more detailed information from IMD websites (which seem to be on an extended weekend holiday) through the day , I have placed above :-
a. Satellite image from Nepal MFD which shows the storm position at approx 8.00pm IST.
b. Image of lightning (blue dots - associated severe weather in thundershowers and rain) in the entire south Asian region from the University of Washington at approximately the same time.
The lightning position in India coincides with the storm position.( The red stars in the lower image indicate position of the ground stations for lightning detection)
2. The absence of clouding from south Bengal as compared to previous image should come as a huge relief to most of us.

Praful Rao,
Kalimpong,
Dist Darjeeling

STH Stormwatch : Update on depression on 02Aug2015

Above satellite image has been obtained from Nepal MFD since the IMD website is not working from 05.00am till the time of this report.
The storm has moved over Chatisgarh but the image shows significant clouding over south Bengal. I have verified that it is not raining in Kolkata at least.

Praful Rao,
Kalimpong,
Dist Darjeeling

Saturday, August 1, 2015

STH Stormwatch : Update on depression (Bulletin 27)

Excerpt from IMD Bulletin 27 (Bay of Bengal) issued at 2000h (IST) on 01Aug2015
'The depression over Bangladesh moved west northwestwards and lay centred at 1730 hrs IST of today, the 01 August 2015 over Gangetic West Bengal and adjoining Bangladesh near latitude 23.80N and longitude 88.40E, about 30 km south southeast of Berhampore (West Bengal). It would move west northwestwards and weaken into a well marked low pressure area gradually.'
Comment by Praful Rao
I wish IMD would give more frequent weather bulletins and analysis especially when we are exposed to severe and extreme weather. It is pathetic that position of the storm has been updated after almost 9hrs (Bulletin 26  and information on the storm position was issued at 11.30am this morning after which there was no update till now).
The state of IMD AWS/ARG stations are no less dismal with most of the AWS/ARG stations either non-functional or giving erratic data.
Thank goodness their satellite imagery is different and works almost flawlessly well.

Praful Rao
Kalimpong,
Dist Darjeeling

STH Stormwatch : Update on depresssion from IMD (1130h, 01Aug2015)

Excerpt from IMD Bulletin No 26 (Bay of Bengal) Issued at 1130h (IST) on 01Aug2015 

'The depression over Bangladesh remained practically stationary during past 3 hours and lay centred at 0830 hrs IST of today, the 01 August 2015 over Bangladesh near latitude 23.20N and longitude 89.20E, close to Jessore (Bangladesh). It would move west northwestwards and further weaken into a well marked low pressure area gradually.'


Rainfall in the past 24hrs 
Kolkata : 133.6mm
DumDum : 131.4mm
Gangtok : 2.5mm
Kalimpong : 2.2mm
 
Praful Rao,
Kalimpong,
Dist Darjeeling

Thursday, July 30, 2015

STH Stormwatch : Update on Cyclone Komen (30Jul2015 - Night)

Excerpt from "All India Weather Inference" (2030hrs IST)
"The cyclonic storm 'KOMEN' over northeast Bay of Bengal moved northwestwards and lay centred at 1730 hours IST of today, the 30th July, 2015 close to Bangladesh coast near Lat. 22.4 °N and Long. 91.3° E, about 20 km east of Hatia (Bangladesh).
The cyclonic storm is in the process of crossing Bangladesh coast between Hatia and Sandwip (Bangladesh) as the northern part of the cloud band already lies over land, The entire process of landfall would take a few hours.
After landfall, it would move initially northwestwards and then west­ northwestwards and weaken gradually."

Praful Rao
Kalimpong,
Dist Darjeeling

STH Stormwatch (30Jul2015) : The depression intensifies : 'Cyclone Komen' is born

Excerpt from TROPICAL CYCLONE ADVISORY BULLETIN (IMD)

 'THE DEEP DEPRESSION OVER NORTHEAST BAY OF BENGAL MOVED NORTH WESTWARDS DURING PAST 9HRS, INTENSIFIED INTO A CYCLONIC STORM KOMEN'
STH has been tracking Cyclone KOMEN for several days now, since it first appeared as a low pressure area. This is the first cyclone to form in the Bay of Bengal in 2015.
We will continue to post updates.

Praful Rao,
Kalimpong,
Dist Darjeeling

Wednesday, July 29, 2015

STH Stormwatch (Updated tracks of depression in Bay of Bengal) from JTWC and position of depression (IMD) : 29/30Jul2015


The above updates are from here.


Praful Rao,
Kalimpong,
Dist Darjeeling

STH Stormwatch : Update on DEEP depression in Bay of Bengal (29Jul2015)

Placed above are images from JTWC (Google Earth) and the latest IR2 image from IMD of the deep depression in the Bay of Bengal.

Excerpt from IMD (0900h, 29July2015)
'The depression over northeast Bay of Bengal and adjoining coastal areas of Bangladesh & West Bengal moved southeastwards, concentrated into a deep depression and lay centred at 0530 hours IST of today, the 29th July, 2015 over north east Bay of Bengal and adjoining areas of Bangladesh near Lat. 21.0 ° N and Long. 91.0 °E, 160 km south­ southwest of Chittagong (Bangladesh). The system would move nearly northward and cross Bangladesh Coast on 30th forenoon between Long. 90.5 °E and 91.5 °E.'

Praful Rao,
Kalimpong,
Dist Darjeeling

NB: Italics are mine.

Saturday, July 25, 2015

STH Stormwatch (25Jul2015) : Low pressure forms in NE Bay of Bengal. (UPDATED 27July2015)

South Bengal has been getting unusually heavy rainfall over the last fortnight or so, unfortunately there seems to be more rainfall in the offing with a low pressure forming in approx the area circled. The low pressure will intensify into a depression soon as per IMD's 'All India Weather Summary and Forecast Bulletin' issued on 25July2015 (night).

Praful Rao
Kalimpong,
Dist Darjeeling

Update 1.
As per All India Weather Inference (2000h, 26Jul2015 - Sunday)
The Low Pressure has intensified into a depression and may concentrate further into a deep depression. It moved westwards and is now close to Khepupara (Bangladesh). Likely to remain stationary there for some time.
Update 2 (27Jul2015)
The depression has remained stationary and likely to remain so for some time. It may intensify into a deep depression

Sunday, July 19, 2015

Upcoming events : DRR Seminar on ' How safe are our Mountain Habitats?' at Kalimpong on 17Aug2015

With the weather exhibiting mood swings as in a bi-polar disorder, Kalimpong has been reeling under a spate of landslides (see previous blog) and it is therefore apt that we have chosen this town as the venue of a DRR seminar on 'How safe are our Mountain Habitats?'
The seminar is the initiative of the Darjeeling Chapter of InMI ( of which STH is a member)

Praful Rao,
Kalimpong,
Dist Darjeeling