The India Meteorology Department (IMD) has said that ‘warm air advection' is causing maximum and minimum temperatures to continue to remain appreciably above normal over many parts of northwest and central India.
The net result of warm air advection, a process in which the wind blows from a region of warm air to a region of cooler air, makes the region warmer. This is expected to help the summer clime gradually entrench itself over northwest India.
MERCURY RISE
Explaining the ‘advection' process, experts say wind blows from a region of warm air to a region of cooler air, resulting in a warming of the colder region. As the warm advection persists, temperatures in the colder region begins to increase.
On Thursday, maximum temperatures were above normal over most parts of Rajasthan, many parts of Haryana, Himachal Pradesh, Uttarkhand, Madhya Pradesh, north Chhattisgarh, Orissa, Gangetic West Bengal, Manipur, Tripura, west Uttar Pradesh, Bihar, Vidarbha, Andhra Pradesh, Karnataka, Tamil Nadu and Kerala.
While no significant change is expected in minimum temperatures over northwest India during the next 24 hours, the maximum temperature is expected to fall over northwest India during the next two days due to cloudiness from a prevailing western disturbance.
Meanwhile, the western disturbance of moderate intensity lay parked over the western Himalayan region with an induced upper air cyclonic circulation over central Rajasthan. Coming close on its heels is a fresh westerly system, which will impact both western Himalayas and Punjab around Saturday.
Strong northwesterly to westerly winds are prevailing over Gangetic plains in the lower levels.
Satellite imagery on Thursday morning showed convective clouds over Jammu and Kashmir. Low to medium clouds (partly cloudy) were seen over Himachal Pradesh, Punjab, Uttarkhand and the Northeastern States.
Scattered to fairly widespread rain or snow is expected to occur over Jammu and Kashmir and Himachal Pradesh during the next 24 hours, and isolated thereafter. Scattered rain or snow will occur over Uttarkhand during this period. Scattered to fairly widespread rain or thundershowers have also been forecast for the Northeastern States. Isolated rain or thunderstorms are likely over Punjab, Haryana, Delhi and parts of west Uttar Pradesh during the next 24 hours.
Forecast for the week ending March 11 by the US National Centres for Environmental Prediction (NCEP) suggests that snow, rain and thunderstorms will prevail southward from Jammu and Kashmir, Himachal Pradesh, Uttarkhand, Punjab, Haryana, parts of north Rajasthan, Delhi and west Uttar Pradesh.
These (snow, rain, thunderstorms) will be piloted by back-to-back western disturbances trooping in from across the border around Saturday and by mid-week next week, according to predictions from the European Centre for Medium-Range Weather Forecasts (ECMWF).
Early forecasts by NCEP for the following week (March 12-20) suggest that western disturbances will continue to roll in, setting up the weather over north, extreme northwest, east and northeast India.
The weather will be particularly heavy over west Uttar Pradesh and along the Himalaya foothills and Nepal where heavy rains can trigger landslides, according to the forecasts.
No comments:
Post a Comment