After the devastating Teesta valley GLOF of 04Oct2023, our region went in for a four and a half month drought where we did not get a drop of rain:
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Screenshot of my post in our What'sApp group, 'Hazard Alerts' showing forest fires in Jan2024. |
The drought-like conditions continued right upto mid-March2024 with acute drinking water scarcity in many of the urban centres in our region - in Kalimpong there was a 3 day waiting list for anyone wanting to buy water from the water tankers and also, I believe people have started drilling for ground water again. In the rural areas, springs dried up.
Winter rains are caused by Western Disturbances (WDs) which originate around the Mediterranean sea.
DownToEarth reported on the matter, excerpts of which are placed below:
'There has been a lack of rainfall during the post-monsoon season and next to
no winter snowfall in some of the north Indian states as a result of a lack of
intense western disturbances. This can affect the yield of Rabi crops in these regions and also availability
of water in the mountains in general. The lack of snowfall in the mountains
could also lead to a warmer than normal pre-monsoon season, with excess
rainfall that could affect the harvesting period of Rabi crops.
Winter precipitation in north India is essential to ensure people’s food and
water security. While Rabi is the major cropping season encouraged by rainfall,
the glacial streams and rivulets in the Himalayas are fed by melting snow and
ice later in the season.
The only source of rainfall and snowfall in the region are extratropical storms
known as western disturbances (WD), which travel from the Mediterranean region.
They induce cyclonic circulations in the lower layers of the atmosphere, which
cause rainfall in the plains and snowfall in the mountains. They also interact
with other wind systems such as the easterlies (winds blowing from the east) to
cause rainfall in central India.
The WDs have been showing
a decline in intensity in the past few years due to changing climate. The
trend continued in the post-monsoon and winter seasons of 2023 as well.
From October 1, 2023 to January 2, 2024, 16 WDs have affected India — five
in October, five in November and six in December — out of which only three have
been intense and caused rainfall, according to data from the India
Meteorological Department (IMD), analysed by Down To Earth (DTE).
This has caused rainfall deficits in states like Uttarakhand and Himachal
Pradesh. While Uttarakhand experienced 47 per cent less rains than normal from
October 1 to December 27, the deficit in Himachal Pradesh was 40 per cent,
according to data from IMD.
Eight out of the 13 districts of Uttarakhand had deficient rainfall (20-59
per cent less rainfall than normal) and four of them suffered from large
deficient (greater than 60 per cent deficit) rainfall. Udham Singh Nagar
district had the maximum deficit of 87 per cent.
In Himachal Pradesh, four districts had deficient rainfall and two had large
deficient rainfall. Lahaul and Spiti district had the maximum deficit of 73 per
cent.
“Himachal Pradesh and Uttarakhand received deficient precipitation since
western disturbances during the post-monsoon were weak in nature,” Akshay
Deoras, a research scientist at the National Centre for Atmospheric Science and
Department of Meteorology, University of Reading, United Kingdom, told DTE.
“The western disturbance activity witnessed a southward dip in December,
causing good rainfall over central India, but either deficient or scanty
rainfall over most of northern India in December,” he added.
Towards the end of November, a moderately intense WD interacted with a lower
level trough in the easterlies and chased significant rainfall in central and
western Indian states of Gujarat, Maharashtra and Rajasthan.
“The northwest rainfall reduction is consistent with the general decreasing trend in western disturbances and the precipitation drop over the region. But the El Nino also tends to produce colder winters over parts of this region,” Raghu Murtugudde, a climate scientist at the University of Maryland and Indian Institute of Technology Bombay, told DTE.
Murtugudde predicted that the
pre-monsoon season will be warmer and probably get more rainfall because
of the Arabian Sea warming. “If the summer transitions to a La Niña
then we should have excess rainfall during the monsoon season,” he
concluded.
The drought mercifully ended on 20March2024 in Kalimpong and also the rest of
.Sub - Himalayan WB and SIkkim with thundershowers commencing at 2.30am.
The weather systems which affected us and the cloud image is shown below:
For the past few days we have had welcome light rain in our region. Rainfall totals from 20-22Mar2024 are given below:
Darjeeling 118.6mm Kalimpong 67.2mm Bagdogra 92.1mm Gangtok 46.2mm
NH10 status
We have reported extensively on the impact of the GLOF on roads and bridges in our earlier blogs including one exclusively on the part of NH10 which is now causing massive traffic jams here.
What is alarming is that after absolutely no rain for months, the first light/moderate rainfall can disrupt our communication lines so much - an issue which was pointed out by us in the report submitted to the NDMA & SDMAs of W Bengal and Sikkim on 10Nov2023.
Excerpt of the report is below
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Traffic jams today at Chitrey (top) and Teesta bazar on NH10 (Images from Hazard Alerts What'sApp group - many thanks:) |
NH10 and alternate routes in the Kalimpong- Sikkim area
Praful Rao
Kalimpong district
Darjeeling-Sikim Himalaya
savethehills@gmail.com
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