07 Mar 2021 11:49 IST

Thunderstorms strike Lanka, South TN likely next

Thunderstorms (bottom, in green) have erupted over the island nation of Sri Lanka and are about to strike southern parts of Tamil Nadu next as part of an emerging new wet spell even as western disturbances are busy 'creaming' the tops of the hills of the Western Himalayas (on top, in green and blue). Photo: The Weather Company

European agency sees extended wet spell

The Sri Lankan Meteorological Department has said that showers or thundershowers will continue at several places over most parts of the island after being thumped by a rain wave emerging from the South-West Bay of Bengal and the adjoining Equatorial Indian Ocean. Satellite pictures on Sunday evening showed clouds having migrated to the western parts of the island nation even as the East continued to host more.

The Sri Lankan Met had warned of fairly heavy falls above 7.5 cm at some places in Central, Sabaragamuwa, Southern, North-Western and Western provinces and a few showers in the Eastern and Uva provinces. Misty conditions were forecast over the Central, Sabaragamuwa, Uva and Western provinces.

The European Centre for Medium-Range Weather Forecasts (ECMWF) has said in its outlook that the thundershower regime over Sri Lanka would move gradually northward and cover parts of Tamil Nadu and Kerala before it extends into further parts of the South Peninsula later into this month.

IMD outlook

India Meteorological Department (IMD) agreed, indicating on Sunday morning that the thunderstorms with lightning may line up across isolated places over Tamil Nadu, Puducherry and Karaikal as early as on Monday. From Tuesday, these pre-monsoon thunderstorms could extend into Kerala and Mahe, the IMD said.

Meanwhile, the ECMWF projected in an extended outlook that this spell over Peninsular and East-Central India may progressively link up with western disturbances moving across North India and seasonal thunderstorms over North-East India (Kal Baisakhi) to cover two-thirds of the country by mid-April.

Only parts of Rajasthan, West Madhya Pradesh and Gujarat may sit out. The western-most boundary of the wet weather regime should, by mid-April, run along Jamnagar, Nashik (including Mumbai), Nanded-Waghala, Aurangabad, Indore, Bhopal, Jhansi, Kota, Jaipur, Agra, Bikaner, New Delhi and Bathinda. All areas to the East (East and Central )would receive rain showers during this period.

Incoming western disturbance in Pakistan

The IMD located an incoming western disturbance as a trough over South Pakistan on Sunday evening and an offspring cyclonic circulation over North-West Rajasthan. After widespread rainfall/snowfall with isolated heavy falls on Sunday,  the combine may trigger isolated rainfall/snowfall over the region on Monday and Tuesday.

Isolated trace/very light rain/drizzle is also forecast over the adjoining plains of Punjab, Haryana,

Chandigarh and Delhi until Wednesday. Isolated thunderstorm with lightning and hail was forecast over Jammu, Kashmir, Ladakh, and Himachal Pradesh, and North Haryana on Sunday and over Uttarakhand until Monday.