Weather update. Monsoon, western disturbances to plot exit of heat wave conditions

Heat wave conditions over the country will abate from Saturday under the combined influence of monsoon making steady progress in the Arabian Sea and the Bay of Bengal and cooler western disturbances resuming their itinerary across the plains of North-West India and East India into the next week.

India Meteorological Department (IMD) said on Friday the monsoon has advanced into parts of South Arabian Sea and southern parts of Maldives on the Arabian Sea side and into more parts of South and East-Central Bay of Bengal. Over the Bay, the monsoon flows are rallying around a depression off the Myanmar coast, after Thursday’s low-pressure area underwent intensification twice over in the space of 24 hours.

A basin-wide view of cloud build-up over the Arabian Sea, the Bay of Bengal and the South Peninsula on Friday morning, backed up by strong south-westerly monsoon flows. | Photo Credit: (nil)

Pre-monsoon rain at a peak

A cyclonic circulation lies over south interior Karnataka and a North-South trough runs across Central and Peninsular India, both pre-monsoon systems. They will combine to cause widespread light to moderate rainfall with thunderstorms, lightning and gusty winds over Kerala and Mahe during the next five days and over Karnataka up to Sunday with heavy to very heavy falls over coastal and south interior Karnataka. Isolated heavy rainfall is likely over Kerala until Sunday.

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May relent over South Peninsula

Isolated to scattered light to moderate rainfall with isolated thunderstorms, lightning and gusty winds are likely over Tamil Nadu, Andhra Pradesh and Telangana. But the heavy rainfall trend may relent over South Peninsula from Saturday as the rain-driving pre-monsoon systems die out as they should, to give way for the real monsoon. Meanwhile, a wet spell will unfold over North-West and East India with thunderstorms gaining intensity from Sunday to Tuesday.

Western disturbances

This spell will be engineered by successive western disturbances travelling from North-West to South-East across North-West India into East and North-East India, rolling down a trough under which thunderstorms will breed. Scattered to fairly widespread light to moderate rainfall with isolated thunderstorms, lightning and gusty winds are likely over the hills of North-West India while hailstorms may strike Himachal Pradesh and Uttarakhand.

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