Pre-monsoon rain and thundershowers have already commenced over East and Northeast India. During the last 24 hours, Contai in Gangetic West Bengal has recorded 99 mm of heavy rain. Kolkata has also received 33 mm rain on April 5th. A cyclonic circulation has formed over Jharkhand and adjoining parts of north Chhattisgarh. Moisture laden winds are blowing from the Bay of Bengal over East India.
Rain activities are expected to increase over West Bengal and coastal parts of Odisha. Few intense spells of rain and thundershowers are possible over West Bengal and Odisha. These pre-monsoon activities are expected until April 12 or 13. Thereafter intensity and spread may go down. But on and off pre-monsoon thunder activities may continue thereafter as well. The cyclonic circulation will persist with some oscillation to east and west. A trough will also extend up to Marathwada and adjoining Telangana.
The intensity of thunderstorms usually increases by the later part of April. Intense thunderstorms known as Norwesters are its peak in May and June when temperatures remain more than 43 and 44 degrees. These weather activities are accompanied by very strong winds and lightning strikes. The potential of damage to life and property is enormous. Fortunately, this rain episode will not be very intense therefore, the chance of damage to life and property is almost ruled out.