Thursday, April 29, 2010

Thunder squalls likely in east, north-east

India Meteorological Department (IMD) on Wednesday warned about the possibility of isolated thunder squall over the north-eastern States, West Bengal, Sikkim, Bihar, Jharkhand and Orissa, apart from Kerala in the South, during the next two days.

Weather over north-west India would also stay largely unstable with isolated hailstorms or thunder squall forecast over Punjab, Haryana, Delhi, Chandigarh, Rajasthan, Uttar Pradesh and Madhya Pradesh during this period.


The volatile weather is being brought to bear by the causative trough formations spearheaded by embedded cyclonic circulations at all these places.

The IMD on Wednesday traced the most prominent among them running north to south trough from Gangetic West Bengal to Kerala across Orissa, Andhra Pradesh and Karnataka. Embedded upper air cyclonic circulations sat over Gangetic West Bengal and adjoining Jharkhand.

A second trough originating from Gangetic West Bengal headed eastward to Mizoram across Bangladesh and Tripura with an embedded upper air cyclonic circulation over Mizoram. These trough formations in the eastern corridor have seen oodles of moisture being washed inland from the Bay of Bengal in the lower levels of the atmosphere.

Meanwhile, a cyclonic circulation induced by an inbound western disturbance traced to over central Pakistan on Tuesday has moved further east, partly across the international border, to lie over central Pakistan and adjoining northwest Rajasthan. This is seen as stirring up a lot of weather over northwest India in isolated hail storms and thunder squalls extending into as far east as Uttar Pradesh and east-southeast into Madhya Pradesh as well.


The IMD stated on Wednesday that the western disturbance is affecting western Himalayas and would stay active over the region during the next two to three days.

Satellite imagery on Wednesday morning showed the presence of convective (thunderstorm/thundershower-causing) clouds over parts of Jammu and Kashmir, south Bay of Bengal and south east Arabian Sea.

Low to medium clouds (partly clouded conditions) were witnessed over Himachal Pradesh, Punjab, west Haryana, west Uttar Pradesh, north Rajasthan, east Madhya Pradesh, Chhattisgarh, Orissa, south peninsular India, south Andaman Sea and remaining parts of south Arabian Sea.

The cloud cover is expected to bring about a fall in maximum temperatures by 2-3 deg Celsius over northwest and adjoining central India during the next two days.

The European Centre for Medium-Range Weather Forecasting (ECMWF) is of the view that northwest and central India would start heating up once again once the effect of the western disturbance wears out.

The US National Centres for Environmental Prediction (NCEP) is of the view that rain or thundershowers over northeast India and the southwest coast would continue into the second week of May.

An IMD outlook until Saturday said that scattered to fairly widespread rain or thundershowers would occur over Assam, Meghalaya, Arunachal Pradesh, Nagaland, Manipur, Mizoram and Tripura.

Scattered rain or thundershowers are also likely over Jammu and Kashmir, Himachal Pradesh and Uttarakhand.

Isolated dust storm or thunderstorms have been forecast over Punjab, Haryana, Delhi, Chandigarh, Rajasthan, Uttar Pradesh, north Madhya Pradesh and Chhattisgarh during the next two days.

Isolated to scattered rain or thundershowers would occur over West Bengal, Sikkim, Bihar, Jharkhand and Orissa. Isolated rain or thunder showers are likely over Maharashtra.

Isolated to scattered rain or thundershowers has been forecast over Andhra Pradesh, Karnataka, Tamil Nadu, Kerala, Lakshadweep and Andaman and Nicobar Islands.

Forecast until Monday said that fairly widespread rainfall activity would occur over the north eastern States while it would be isolated over east and south peninsular India.

Severe heat wave conditions have been prevailing over isolated pockets of Himachal Pradesh during the last 24 hours ending Wednesday morning.

Heat wave conditions prevailed over parts of Haryana, west Uttar Pradesh and Rajasthan and isolated pockets of Punjab, north-west Madhya Pradesh and Jharkhand. The highest maximum temperature of 45.5 deg Celsius was recorded at Jhansi in Uttar Pradesh.

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