GUWAHATI, June 11 - The pre-monsoon rainfall pattern in Assam and Tripura has shown some changes this time, said Regional Meteorology Centre (RMC) sources here on Friday.
Meanwhile, it is expected that the onset of the South-West Monsoon may take place in NE region in the next two to three days, the sources said.
The sources maintained that the frequency of the Western Disturbance system during the pre-monsoon season this time was more. This brought about a change in the pre-monsoon rainfall pattern in Assam and Tripura. However, when the whole of the NE is taken into consideration, it recorded a deficit pre-monsoon rainfall, despite Assam and Tripura respectively recording 21 per cent and 20 per cent excess rainfall. The phenomenon might have been caused by climate change, the sources said.
This year, rainfall and thunderstorm activities were more frequent in Assam-Meghalaya and Nagaland-Manipur-Mizoram-Tripura Meteorological Subdivisions due to the local conditions of intense heating of land. But, in Arunachal Pradesh, besides intense heating of land, Western Disturbance also contributed to the pre-monsoon rainfall and thunderstorms.