Financial Daily from THE HINDU group of publications
Saturday, Dec 31, 2005
Financial Daily from THE HINDU group of publications Saturday, Dec 31, 2005 |
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Climate & Weather Industry & Economy - Climate & Weather Fog alert for plains in northwest early next week Vinson Kurian
Thiruvananthapuram , Dec. 30 A WESTERN disturbance of moderate intensity lying over Pakistan has started moving east and is expected to start affecting northwest India from Saturday onwards. The passage of the system will leave in its wake foggy conditions over the plains of northwest India beginning January 3 (Tuesday next), according to a forecast by the National Centre for Medium Range Weather Forecasting (NCMRWF). Immediately after the passage of a western disturbance, lot of moisture is available in the atmosphere and the prevailing local conditions provide the trigger for the formation of fog. Scattered to fairly widespread rain/snowfall is likely over the hilly regions of northwest India such as Jammu and Kashmir, Himachal Pradesh and Uttaranchal. Scattered rainfall is also likely over the plains in Punjab, Haryana (including Chandigarh and Delhi), north Rajasthan and Uttar Pradesh from Saturday until Monday. A `snow watch' advisory has been issued to tourism authorities in the hill stations as these areas are likely to experience moderate to heavy snowfall ahead of the passage of the system, said Dr Akhilesh Gupta of the NCMRWF said. According to him, this will be the first such of the season that truly captures the essence of all classic features associated with a western disturbance. He said the signature weather associated with the incoming system will be best evidenced in a sharp rise in night temperatures in northwest India - to the order of 5 deg C to 12 deg C - resulting from the warm and rising air in the front. The rear of the system will be contrastingly cold and will carry subsiding air, Dr Gupta told Business Line. In the tropics, weather-creating low-pressure systems tend to bring down temperatures since associated clouds mask the sun, cutting down the incoming radiation. The rains the system brings also help cool down the ground. But in the case of western disturbances, the warm and rising air in the front causes ambient pressure to come down creating a `low' and cloud formations to trigger wet weather in the plains and snowfall in the higher reaches. But the rear will see cold and dense air set in, leading to subsidence, higher pressure, clear skies but high northwesterly winds. This is what triggers cold wave and fog as the systems passes. The NCMRWF forecast said that in the South, Thursday's upper air cyclonic circulation over Kerala and neighbourhood had shifted to over southeast Arabian Sea on Friday. Another upper air cyclonic circulation lay over southwest Bay of Bengal. These may cause isolated rainfall activity over the Andaman and Nicobar Islands, Tamil Nadu, Kerala and Lakshadweep during the next 24-48 hours.
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