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Vinson Kurian

North-East too experiences wet weather

Thiruvananthapuram , May 3

Heat wave conditions have abated in Tamil Nadu under the benign gaze of an `easterly pulse' not amounting to an easterly wave.

An easterly wave/pulse is an area of weak low pressure that drifts to the west in the belt of prevailing easterly winds just north of the equator. The pulse brought rainfall/thundershowers over south Tamil Nadu and south interior Karnataka during the 24-hours ending Wednesday morning.

Day temperatures have fallen by 2-4 degree Celsius over Tamil Nadu and Andhra Pradesh as also Punjab, east Uttar Pradesh, Bihar, sub-Himalayan West Bengal and the North-East.

An update by the National Centre for Medium range Weather Forecasting (NCMRWF) said that North-East too experienced some wet weather.

A prevailing western disturbance brought rain/thundershowers to Jammu and Kashmir, Himachal Pradesh and East Uttar Pradesh. But the mercury is still above the 40 deg C-mark over Rajasthan, Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Jharkhand, interior Maharashtra and the northern parts of Andhra Pradesh and Karnataka.

`Good for monsoon'

Predictions indicate that the hot climes will hold for the next four to five days. This is good for the monsoon, said Dr Akhilesh Gupta of the NCMRWF.

Heating of the core monsoon regions of Central, North and Northwest India is what determines how the monsoon pans out. A cooler peninsula should not, therefore, worry weather watchers.

The monsoon normally arrives over the Andamans by mid-May. Satellite pictures show some helpful circulatory features in the Inter Tropical Convergence Zone (ITCZ), a band of low air pressure centered on the equator.

But no weather model has been able to pick these features, Dr Gupta said. It's the seasonal northward movement of the ITCZ that drags the rain-bearing clouds of monsoon with it.

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Heat wave abating over Peninsular India

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