The Hindu Business Line : Squall, hail punctuate weather in North

Thiruvananthapuram, April 4 Staggered waves of light to moderate thundershowers with isolated squall or hail scythed through northwest, central and east India and the Northeastern States during the 24 hours ending Friday morning.

The unstable weather is forecast to linger over northwest and central India until Saturday, while east India and the northeast would witness thundershowers and isolated hail/squall for three more days, says an India Meteorological Department (IMD) update.

The IMD has also issued a warning valid for the next two days that spoke about the possibility of isolated thunder squall and hail over the Jammu Division, Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh, Uttarakhand, Himachal Pradesh, West Bengal, Sikkim and Jharkhand.

The most prominent among the configuration of weather features on Friday was the deep western disturbance that persisted over Jammu and Kashmir and neighbourhood. The induced cyclonic circulation over south Pakistan and adjoining west Rajasthan rustled up its impact several fold.

Thursday’s trough from sub-Himalayan West Bengal and Sikkim to north Orissa through Gangetic West Bengal persisted. A cyclonic circulation hovered over Gangetic West Bengal.

LET-UP BY MONDAY

The IMD said that the prevailing weather would relent by Monday, with a corresponding mark-up in daytime temperatures over the northwest. It is here and the adjoining eastern Pakistan that progressive and sustained solar heating causes surface pressures to fall to set up the `heat low’.

The `heat low’ helps throw in the required atmospheric pressure values and aligns it along a suitable gradient from the south (Thiruvananthapuram with atmospheric pressure of around 1010 millibars) to the northwest (west Rajasthan, at 992 millibars) along which the monsoon current sprints to upcountry destinations. It also anchors the all-important monsoon trough that would extend to the Head Bay of Bengal.

RECORD LOWS

But as of now, there is no sign of the required heating pattern evolving, what with the deep western disturbance lording it over the region. Surface temperatures too have fallen to record lows for this time of the year, and it would take sometime for the air to warm by way of subsidence.

The prevailing rain/thundershowers and cloudy weather have brought down maximum temperatures to below 8-10{ring}C of the normal over Haryana, Punjab and adjoining Rajasthan and 4-6{ring}C over the remaining parts of northwest and adjoining central India. The current temperature scenario is likely to continue for two more days and reverse thereafter.

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