Updated on April 8, 2016 11:30 AM (IST): Intensity of pre-Monsoon rain in Northeast India to reduce
For the past few days, rains have been lashing several areas of Northeast India.
Light to moderate rain and thundershowers have been observed in many pockets of the region for quite some time now. Some areas have also recorded heavy rainfall.
During the last 24 hours from 8:30 am on Thursday, Pasighat received a whopping 49 mm rain, followed by Silchar where 24 mm rain was recorded.
Other areas to have observed rains in Northeast India include North Lakhimpur 15 mm, Dibrugarh 12 mm, Guwahati 5 mm, and Tezpur 0.9 mm rain.
These rains can be attributed to a cyclonic circulation which is currently over Sub-Himalayan West Bengal. Also, a trough is extending from this system up to North Bay of Bengal.
Now, rain intensity is likely to reduce during the next 48 hours or so. However, scattered rain will continue over isolated pockets.
Thereafter, Northeast India rains will once again pick up pace and lash several areas.
Updated on April 6, 2016 02:00 PM (IST): Intensity and spread of pre-Monsoon rain in Northeast India increases
Northeast India has been receiving pre-Monsoon rains for the last couple of days. These showers were mostly confined to extreme southeastern parts of the region with good to heavy showers being witnessed in Tripura, Mizoram, Meghalaya and Southeast Assam.
Incessant rains in Northeast India so far was in association with the well-marked cyclonic circulation over Gangetic West Bengal and Bangladesh. This system will now shift upwards and stay put over Assam and Meghalaya region.
During last 24 hours, Cherrapunji received a whopping 150.8 mm of rain. Pasighat in Arunachal Pradesh received 58 mm of rain. In Assam, Dibrugarh received 33 mm, North Lakhimpur 33 mm and Silchar 27 mm and Guwahati 6 mm. Hasimara, a small town in Sub-Himalayan West Bengal received 210 mm of rainfall. Diana and Alipurduar also received heavy rainfall to the tune of 120 and 110 mm.
With this shift in the weather system entire Northeast India will receive pre-Monsoon showers over the next few days. However, rainfall will now be heavier over the upper parts of Assam and Arunachal Pradesh. Sikkim also stands a change of receiving fairly widespread rain with few heavy spells.
Updated on April 5, 2016 11:00 AM (IST): Northeast India receives heavy pre-Monsoon rain after dry winters
Winter rains in Northeast India were deficit this year. It’s no surprise considering the pan-India deficit rainfall figures. All the three subdivions of Northeast India – Assam and Meghalaya, NNMT (Nagaland, Manipur, Mizoram and Tripura) and Arunachal Pradesh witnessed rainfall deficiency.
In the month of March, pan-India rains were normal but rain deficiency continued in all the three subdivisions of Northeast India. NNMT witnessed a deficiency of 32% followed by Arunachal Pradesh with 27% rain deficiency and Assam with 22%.
However, this region has been receiving good showers since the last couple of days of April. Heavy showers were also received in the last couple of days. Rain in Northeast India could be attributed to back to back Western Disturbances which move away eastwards after affecting North India. As the Western Disturbances reach Northeastern states we may not be able to manifest them in terms of any prominent weather system due to their terrain but they inevitably affect weather in the region.
Secondly, the anti-cyclone in Bay of Bengal remains as a semi-permanent feature during this season. It keeps throwing moist winds over Northeast India.
At present, we can see a well-marked Cyclonic circulation over Bangladesh and Gangetic West Bengal. This system will continue to bring good showers over Southeast Assam, Tripura, Mizoram and Meghalaya will receive good showers. On April 4, Agartala and Kailashahar in Tripura recorded 97.6 mm and 129.6 mm of rainfall, respectively. Both these places received the second highest rainfall recorded in a span of 24 hours. Silchar in Assam also received 44.2 mm of rain.
The monthly normal rainfall figures are also quite high in this region, unlike in North and Central India.
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