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Thursday, Mar 22, 2007
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Climate & Weather Agri-Biz & Commodities - Climate & Weather Thunder squalls line up plains of the northwest Vinson Kurian
"The prevailing western disturbance could well be the last of the severe, late winter/early spring weather systems passing into the northwest of the country.''
Thiruvananthapuram March 21 Rain, hail and high winds have been reported from parts of Punjab and Haryana as thunder squalls lined up along the plains in Northwest India over the past two days. Similar conditions are expected to continue in the region for another day. Isolated hail/squall is also likely over Punjab, Haryana, Chandigarh and Delhi, Rajasthan, Bihar and the Northeastern States during the same period, according to the National Centre for Medium Range Weather Forecasting (NCMRWF). Isolated heavy precipitation is likely over Jammu and Kashmir during the next 24 hours. The busy weather has come about with the predicted arrival of a western disturbance of moderate strength, which is expected to progressively set up thunderstorms and isolated hail over Uttar Pradesh, Bihar, Jharkhand and West Bengal over the next few days. Some of the rainfall reported during the last 24 hours in the Northwest have been `very high' for this time of the year, said Mr Ranjeet Singh of the NCMRWF. The prevailing western disturbance is a spill over system from a severe winter storm traced to the Mediterranean region well over a week ago. According to Mr Singh, this could well be the last of the severe, late winter/early spring weather systems passing into the northwest of the country.
Semi-permanent trough
A well-heeled and semi-permanent trough lying over South Pakistan and adjoining West Rajasthan is in the process of being replaced by an anti-cyclone, which would put a lid on intense weather activity in the region. The presence of semi-permanent trough has meant that the feeblest western disturbance kicked itself into life after bypassing it, growing further in intensity as it travelled further east into India. But the anti-cyclone (a high-pressure system or ridge) with sinking and dry air could sound the death knell for severe storms. Comparatively much larger in size than a low-pressure area or trough, the anti-cyclone takes its own time settling into place. But the grounds have been cleared, according to Mr Singh. Western disturbances could continue to pass into the country, its strength considerably drained after ramming into the ridge. Arrival of these westerly systems has been reported even during the height of the southwest monsoon. This high-pressure system ultimately helps set up the `heat low' over West Rajasthan, a vital weather feature that decides the strength of the monsoon that hits the Kerala coast later in June.
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