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Intense thunderstorms accompanied with gusty winds/squally weather/hailstorm and rainfall exceeding five cm lashed Coastal Odisha, North Coastal Andhra Pradesh, Telangana and North Tamil Nadu on Saturday/Sunday as thunderheads paraded along the coast n a South-South-West direction.
Coastal Andhra Pradesh record the heaviest rainfall (in cm) in Anakapalle-11; Prathipadu-10; Tada-9; Visakhapatnam and Srungavarapukota-8 each; Visakhapatnam Airport, Vepada, and Gantyada-7; Bhimadole, Chodavaram, and Vizianagaram-6 each; Sullurpeta, Gudivada, Yelamanchili-5 each, an India Meteorological Department (IMD) update said. Chettikulam-6 and Taramani- 5 (Tamil Nadu) and Burgampadu-6; Aswapuram, Mulakalapalle, Palawancha, and Aswaraopeta- 5 each (Telangana) too shared the honours.
Wind discontinuity/trough
The spine of the pre-monsoon activity is a wind discontinuity (where opposing winds from the seas converge) over Peninsular India around which heavy weather breeds. The outcome will be fairly widespread rain or thundershowers along with isolated heavy rainfall likely over Kerala during the next 4-5 days. Rains will continue over Andhra Pradesh, Telangana, Tamil Nadu, Puducherry for the subsequent four days. Thunderstorms, hailstorms, lightning, gusty winds and heavy rainfall are also likely.
Late on Sunday afternoon, rain-bearing clouds were spotted over Pudukkottai, Gandarvakottai, Manapparai, Nachelura, Musiri, massive over Dindigul, Chinnalapatti, Vakkampatti, Athoor and Kanniyadi in Tamil Nadu, and across the Palakkad-Nilambur belt in adjoining Kerala. Thunderstorms were also active over Kollam and adjoining Thiruvananthapuram districts in South Kerala.
Watch for a low-pressure area
The IMD maintained its watch for the first pre-monsoon low-pressure area over the South Andaman Sea around April 30 and its intensification during the subsequent two days. It may initially move north-northwest and later north-north-east along and off the Andaman & Nicobar Islands until May 3.
Squally winds, speed reaching 40-50 km/hr gusting to 60 km/hr (almost touching the intensity of depression) may prevail over the North Sumatra coast, South Andaman Sea, the Nicobar Islands and the adjoining South-East Bay on April 30 and May 1, and over North Andaman Sea, the Andaman Islands and adjoining South-East and East-Central Bay May 2 and 3.
Thunderstorms in North, East
Meanwhile, the formation of a pre-monsoon trough from East to West and associated convergence of winds and moisture from the Arabian Sea and the Bay of Bengal along the plains in the North will sustain the fairly widespread to widespread rainfall over East and North-East India during next two days with peak activity over Odisha, Jharkhand, and plains of West Bengal on Sunday. Isolated heavy rainfall, thunderstorms/thunder squalls are likely over East and North-East India.
Hailstorms may roam over Odisha, Jharkhand and Nagaland, Manipur, Mizoram and Tripura during this period. Scattered to fairly widespread rain/thundershowers is likely over Uttarakhand, Himachal Pradesh and the adjoining plains (mainly Punjab, Haryana, Chandigarh, Delhi and Uttar Pradesh) during the next two days. Isolated hailstorms and gusty winds are also likely over the region.
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