Guwahati, Aug 7 : Monsoon rainfall in the NE region has remained remarkably deficit so far this year. Normally, monsoon withdraws from the NE region in September end.
Sources in the Regional Meteorology Centre (RMC) here attribute this situation to the frequent formation of cyclonic circulations over the North West Bay of Bengal. These cyclonic circulations are preventing flow of the moisture-ladden south-westerly wind to the NE region and hence the region is getting less rainfall, said the sources.
When asked to explain the factors that have led to the formation of cyclonic circulations over the North West Bay of Bengal, sources said that several factors like the sea level surface temperature, atmospheric vorticities and other synoptic situations are contributing towards such developments.
This monsoon, the meteorological sub-division of Arunachal Pradesh recorded 36 per cent deficit rainfall, with an actual rainfall amount of 643.3 mm, against the normal of 1013 mm for the period between June 1 and August 6.
Assam-Meghalaya Meteorological Sub-division recorded 40 per cent deficit rainfall, with an actual of 678.6 mm, against the normal of 1135.6 mm for the above period.
Nagaland-Manipur-Mizoram-Tripura Meteorological Sub-division recorded a deficit rainfall of 55 per cent, with an actual of 468 mm, against the normal of 1046.6 mm for the above period.
During this period, Assam recorded a deficit rainfall of 28 per cent, while Manipur recorded a deficit rainfall of 76 per cent, Meghalaya recorded a deficit rainfall of 63 per cent, Mizoram recorded a deficit rainfall of 40 per cent, Nagaland recorded a deficit rainfall of 50 per cent and Tripura recorded a deficit rainfall of 42 per cent, sources said.
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