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Westerly trough induces wet weather in North

Vinson Kurian

Scattered rains predicted for four days


The forecast
Scattered to fairly widespread rain/snow over the hilly regions of Northwest India starting Tuesday.
Uttar Pradesh, western parts of Bihar and North Madhya Pradesh may receive isolated heavy amounts of rainfall
Day and night temperatures are likely to fall by three to five deg C over Northwest, North and Central India

Thiruvananthapuram , March 7

True to prediction, an active western disturbance approaching the northwest in the form of a deep trough has induced the formation of a cyclonic circulation over Haryana. This has switched on wet climes that promise to propagate to further east and southeast.

Active systems are the most potent among the three types of western disturbances crossing into the country and invariably throw up induced cyclonic circulations over North Rajasthan/Haryana, said Dr Akhilesh Gupta of the National Centre for Medium Range Weather Forecasting (NCMRWF).

An induced cyclonic circulation is hybrid in nature in that it displays tropical and extra-tropical features. It helps `steer' the parent trough to suitably settle into position and dictate local weather.

In the instant case, the combine is likely to cause scattered to fairly widespread rain/snow over the hilly regions of Northwest India starting Tuesday. The induced circulation is expected to move eastwards and interact with an existing pre-monsoon cyclonic circulation over Vidarbha and adjoining Madhya Pradesh.

This interaction will cause scattered to fairly widespread rains and thundershowers in North, Central, East and Northeast India for four days from Wednesday.

Beginning from the Northwest, the wet weather would progressively shift eastward covering North and Central India on Thursday and Friday and onward to East and Northeast India on Friday and Saturday.

Indications are that Uttar Pradesh, western parts of Bihar and North Madhya Pradesh may receive isolated heavy amounts of rainfall. Isolated hailstorm activity is likely over Central India, especially in Madhya Pradesh, Chhattisgarh and Maharashtra during the next three days.

Region-wise forecast by NCMRWF said Jammu and Kashmir, Himachal Pradesh and Uttaranchal are likely to receive scattered to fairly widespread rain/snowfall during the next two days. In the east, East Uttar Pradesh, Bihar and Jharkhand may receive scattered to fairly widespread rains on Thursday and Friday. Isolated heavy rain can occur in Uttar Pradesh and East Bihar on Thursday and Friday.

In Central India, scattered to fairly widespread rains are likely in North Madhya Pradesh and Chhattisgarh. In the south, scattered thundershowers are likely over Tamil Nadu, Pondicherry, Kerala and South Interior Karnataka during the next three days. In the west, isolated hailstorm activity is indicated for Maharashtra.

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