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An ‘active’ (intense) western disturbance affecting North and North-West India has brought the first round of organised showers for the region after the North-East monsoon yielded deficient rain and the dawn of the New Year hardly any.
Western disturbances are low-pressure waves that travels from West to the East across the plains and modulates the winter with associated snow/ice, fog or showers depending on their intensity.
‘Low’ over RajasthanTuesday’s disturbance has, in fact, set up a rare low-pressure area over North-East Rajasthan and adjoining West Madhya Pradesh over Punjab, Haryana, Chandigarh, Delhi and Rajasthan.
The ‘low’ has forced a reigning cover of dense fog, and along with it the cold wave, to migrate to East India. Western disturbances bring in the winds, moisture, warmth and clouds. Hence the showers, snow, and even hail.
The region not affected by the disturbance witnesses sinking motion of air, which brings in the cold Arctic winds to settle and lower the temperatures.
The India Met Department (IMD) has forecast heavy rain/snowfall over Uttarakhand on Wednesday when the weather peaks. Hailstorms are likely at isolated places over Punjab, Haryana, Himachal Pradesh, Uttarakhand and west Uttar Pradesh.
Rain, snow forecastFairly widespread to widespread rainfall/snowfall is likely over Jammu & Kashmir and Himachal Pradesh. Isolated to scattered activity likely over the same and over Punjab, Haryana, Chandigarh, Delhi and West Uttar Pradesh on Thursday also.
East Uttar Pradesh and Bihar are other areas expected to receive showers in line with the eastward movement of the disturbance.
Along with this, mercury would start plunging over North-West India as the eastward moving disturbance carries its rain-head towards the East f the country (including East Uttar Pradesh and Bihar).
The next western disturbance, a moderately strong one, is expected to arrive over North-West India by the end of the month.
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