Saturday, June 18, 2011

A photo from NH31A and an update on the depression- 18Jun2011


Traffic along the National Highway 31A (NH31A) remained disturbed for the second consecutive day due to landslides, even though the the Border Roads Task Force was quick to respond.
The depression too remained depressingly static, churning around east of Kolkata again for the second consecutive day while Kolkata received 154 mm rainfall, the highest for any single day in June in the last decade.

Praful Rao

One day of rain - 17Jun2011

It seems incredible that just a few days ago I was blogging (see here and here) about the deficient rainfall this year in the hills of Darjeeling and Sikkim (which has resulted in many of the perennial springs in this region drying up) and on17Jun2011, just a couple of days later, in a spell of rain lasting not more than 12hours, three children and a young father lost their lives to landslides in Kurseong (Darjeeling dist).
The rains also triggered a small slip near the 27th Mile, Stage III, NHPC Lo-Dam. Small though it was, it brought all the traffic on National Highway 31A to a grinding halt for 5 hours or more with 500 odd vehicles being stranded on either side of the slip.
The above incident speaks volumes of the state of our disaster preparedness or the lack of it, considering that in Feb2011, Severe Cyclone YASI, a storm bigger than KATRINA, smashed into Queensland in Australia but resulted in only one death thanks, to the excellent early warning and awareness amongst the people.
Miles to go before we sleep!
Some photos of 17Jun2011 are placed below :-




Rainfall stats of 17Jun2011:-

a) Kurseong :- 180mm (source STH ARG at Dow Hill, Kurseong)
b) Kalimpong :-31mm (source STH ARG at Tirpai, Kalimpong)
c) Darjeeling :- 54mm (source STH ARG at Gandhi Road, Darjeeling)

Comment by Praful Rao
My thanks to our young STH member from Kurseong, Bhushan Chhetri for the photos of Kurseong and the story.

Friday, June 17, 2011

STH storm watch update :- Tracking the storm

Placed below are 3 Infra-red images of the depression taken from the IMD website at 0900h GMT (2.30pm IST), 1030h GMT (4pm IST) & 1130h GMT (5pm IST). The movement of the system is clearly discernible..more on the predicted path and track is available here and here


Praful Rao

STH storm watch :- The first depression of 2011 in the Bay of Bengal update

    Sub: Deep depression over Gangetic West Bengal and adjoining Bangladesh.  
      The deep depression over Gangetic West Bengal and adjoining Bangladesh remained practically stationary and lay centred over Gangetic West Bengal and adjoining Bangladesh at 0530 hrs IST of today, the 17 June 2011, near lat. 22.50 N and long. 89.00 E, about 130 km northeast of Sagar Island, 80 km east of Kolkata and 150 km west-northwest of Khepupara (Bangladesh). The system is likely to move north-northwestwards initially and then west-northwestwards and weaken gradually into a depression during next 24 hours.
       Under its influence, rain/thundershowers at most places with heavy to very heavy falls at a few places would occur over north Orissa, Jharkhand and coastal districts of West Bengal during next 48 hours. Isolated extremely heavy falls (25 cm) would also occur over north Orissa during the same period. Rainfall at most places with isolated heavy to very heavy falls would occur over south Orissa, Chhattisgarh and remaining parts of Gangetic West Bengal during next 48 hours.
       Squally winds with speed reaching 45-55 kmph gusting to 65 kmph would occur along and off north Orissa and West Bengal coasts during next 12 hours. Sea condition will be rough to very rough along and off these coasts. Fishermen are advised not to venture into the Sea off these coasts during next 12 hours.
       The system is under constant watch and concerned state Govts are being informed accordingly.
Comment by Praful Rao
As per information received, landslides triggered by the heavy down pour in the early morning today have caused 4 deaths in Kurseong and traffic jams along NH31A. We should be able to give a more correct report soon.

Thursday, June 16, 2011

STH storm watch :- The first depression of 2011 in the Bay of Bengal

One of the primary roles of STH is to maintain a close watch (using the Internet and SMS) on all the adverse weather developments in the Bay of Bengal. Today, the first depression of the season (2011) formed.
An excerpt from the
IMD Cyclone website is placed as under :-

Excerpt from the Cyclone warning page of IMD website
Sub: Deep Depression crossed West Bengal coast. 
The depression  over north Bay of Bengal off West Bengal & Bangladesh coast moved northward, intensified into a deep depression and crossed West Bengal coast near about 100 km east of Sagar Island between 1630-1730 hours IST. The deep depression lay centred  at 1730 hrs IST of today, the 16th June 2011, over Gangetic West Bengal and adjoining Bangladesh near lat. 22.00 N and long. 89.00 E, about 100 km east-northeast of Sagar Island, 100 km southeast of Kolkata and 130 km west of Khepupara (Bangladesh).  The system is likely to move north-northwestwards initially and then west-northwestwards and weaken gradually  into a depression during next 24 hours.
       Under its influence, rain/thundershower at most places with heavy to very heavy falls at a few places would occur over north Orissa, Jharkhand and coastal districts of West Bengal during next 48 hours. Isolated extremely heavy falls (25 cm) would also occur over north Orissa during the same period. Rainfall at most places with isolated heavy to very heavy falls would occur over south Orissa, Chhattisgarh and remaining parts of Gangetic West Bengal during next 48 hours.
       Squally winds with speed reaching 45-55 kmph gusting to 65 kmph would occur along and off north Orissa and West Bengal coasts during next 12 hours. Sea condition will be rough to very rough along and off these coasts. Fishermen are advised not to venture into the Sea off these coasts during next 12 hours.      
     The system is under constant watch and concerned state Govts are being informed accordingly.

The Infra-Red (IR)satellite image of the area  is placed below

 Praful Rao

Wednesday, June 15, 2011

Of rainfall or the lack of it.

Most, if not all the landslides in the Darjeeling-Sikkim Himalayas are rain induced, so keeping a track of the amount of rainfall & rainfall intensities is very much a part of our role.
2010 was a year of deficient rainfall in our area and as such, as far as landslides are concerned - it was a good year.
Rather alarmingly though, we seem to be following this trend in 2011 as well  and thus far, rainfall has again been deficient in most places in this area. The deviations from normals for some of towns in this region is given below :-

Rainfall data upto 14Jun2011


Normal
 Actual
 %departure




CoochBehar
299.3
150.5
-050.0
Bagdogra
205.6
209.1
002.0
Darjeeling
196.6
64.2
-067.0
Kalimpong
147.7
40.8
-072.0
Jalpaiguri
242.4
152.8
-037.0
Gangtok
326.2
293.9
-010.0
Pedong
186.1
137.0
-026.0

(Source I Met D, Sikkim)

And for those interested, I have placed two charts which explain what the Met pundits mean when they talk about rainfall intensities :-

Praful Rao




Friday, June 10, 2011

Monsoon worry for hill roads - From the Telegraph today.


RAJEEV RAVIDAS
Kurseong, June 9: Residents of Kurseong and Darjeeling are worried about the bad condition of the two main roads, connecting the places to Siliguri, that are likely to worsen during the monsoon.
Of the two stretches, NH55 also called the Tenzing Norgay Marg, has been shut since June after a landslide near Paglajhora damaged a stretch on the highway.
Although vehicles are plying Rohini Road, the stretch looks nothing more than a dirt track. A few days of heavy showers can make the road unusable even for light vehicles.
If both these stetches are shut during the rains, the only other Siliguri-Kurseong-Darjeeling road link will be the Pankhabari Road. However, since the route is narrow and steep at several places only small vehicles can ply the route.
Heavy vehicles like trucks carrying essential commodities to Kurseong and Darjeeling will then have to take the circuitous Siliguri-Kalijhora-Mungpoo road.
The detour takes around two hours more. Normally the journey to Kurseong and Darjeeling can be completed in around three hours.
Local residents blame the heavily loaded trucks for turning Rohini Road into a potholed dirt track.
“The up-bound trucks are supposed to take the Mungpoo Road but they do not do so. Most of them drive up to the hills in the night,” said S. Pradhan, the secretary of the Janmukti Chalak Mahasangh, Kurseong, a unit of the Gorkha Janmukti Morcha.He said they would meet Morcha president Bimal Gurung and apprise him of the condition of the roads. “We have already requested the three MLAs from the hills to raise the matter in the next session of the state Assembly,” Pradhan said.
However, since the monsoon has already arrived, it is unlikely that major repair works on the Rohini Road would be taken up now.
The highway (NH55) is in no better shape because the landslide prone area near Paglajhora, which is also a sinking zone, will again get affected once the rains start.
Although the PWD (NH division-9), which maintains the road, said the 475-metre stretch on the road that was breached after the mudslide has been reconstructed, driving through it is unsafe as huge boulders keep falling on the road from the hill side.
“The road is not safe for driving. We are, however, confident that breaches on the road will not occur again,” said Nirmal Mandal, the executive engineer of PWD (NH Division-9).
Residents of the area are, however, worried about the condition of the highway which they think will worsen once it starts raining. They are also apprehensive that the prices of commodities would rise since the vehicles have to take a detour to reach the destinations.
“What were the people responsible for maintaining the roads doing during the dry season? They should have repaired the road before the onset of the monsoon. They should actually compensate for the additional expense that we will have to incur due to the rise in the prices of essential commodities once both the roads are closed,” said Robin Thapa, a resident of Dow Hill.

Comment by Praful Rao
STH has blogged about the landslide at Paglajhora after visiting the place on 10May2011

Monday, June 6, 2011

05Jun2011 - World Environment Day in Kalimpong

W.E.D on 05Jun2011 was celebrated in Kalimpong with a flurry of activities ranging from planting of tree saplings to an art competition and a clean up of the town by volunteers comprising of school children & community groups.
I am glad to say that STH was involved in a number of these activities.

Praful Rao

Saturday, June 4, 2011

Quake report :- 6. 23AM, 03Jun2011

We had a minor earthquake here in Kalimpong on the date and time mentioned (which I think was also felt thruout the Darjeeling-Sikkim area.)  No damage has been reported.
Praful Rao

Friday, June 3, 2011

Rainfall May2011 - running deficient again.


Rainfall Data of May 2011

Darjeeling (126mm)     Kurseong (291mm)     Kalimpong (91mm)

Normal rainfall  for Darjeeling district in May - 258.7mm (Source)

Note :STH ARGs are located at Gandhi Road in Darjeeling, Dow Hill in Kurseong and Tirpai in Kalimpong.

As in this period in 2010 we have had a deficiency in rainfall this year.

Praful Rao