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Vinson Kurian

The warm front-end of the westerly trough has already triggered light to moderate showers across the plains.

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Thiruvananthapuram Jan. 30 A prevailing deep westerly trough with a spread straddling the Central Indian latitudes is causing a churn in weather over North and Northwest India.

The warm front-end of the westerly trough has already triggered light to moderate showers across the wheat growing areas of the plains over the last two days, according to Dr K. J. Ramesh of the Department of Science and Technology.

Thunderstorms have been sweeping across the North, Northwest and Central India raining mostly in the evenings.

But the moisture feed has not been big enough to sustain the rain for longer. This is because the rains bring down the temperature further and puts a lid on the convective activity.

SPORADIC SHOWERS

The sporadic showers will continue for another 24 hours, depending on the extent of moisture mopped from the warm Arabian Sea waters to the west.

An array of cloudiness has emanated from here to the north-northeast ever since the westerly trough has come to dictate weather over the region.

Forecasts for the next 24 hours by the National Centre for Medium Range Weather Forecasting (NCMRWF) and India Meteorological Department (IMD) said that isolated rain/snowfall is likely over Himachal Pradesh. Isolated rain/thundershower is likely over Haryana, Punjab and West Uttar Pradesh.

Isolated rain/thundershowers have been forecast for even sub-Himalayan West Bengal, Sikkim, Arunachal Pradesh, Assam and Meghalaya from Thursday (February 1). North Rajasthan, East Madhya Pradesh and even Chhattisgarh are other likely beneficiaries.

MERCURY UP

Day and night temperatures are above normal by 6 to 8 degree C thanks to the steaming front of the westerly trough. Lowest night temperature in the plains of the country on Monday was 7.4 degree C recorded at Amritsar in Punjab.

However, night temperatures are likely to show a falling trend for two to three days from Thursday. This will happen with the eastward passage of western disturbance, bringing cold air in its wake.

According to the NCMRWF, the warm southerly to southwesterly winds will give way for the cold westerly and northwesterlies. It may cause fall in night and day temperatures for the next three to four days from Thursday, blanketing the North and Northwest India under a cold wave.

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Deep westerly trough churning weather in North India

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