New Delhi, Thursday, June 28 Northwest India will continue to reel under intense heat wave conditions during the next forty eight hours while increase in moisture due to prevalence southwesterly winds will further add to the misery in north India.
The Western Disturbance over north Pakistan and adjoining Jammu & Kashmir may cause scattered rainfall in Jammu & Kashmir, Himachal Pradesh and Uttaranchal. A cyclonic circulation over Punjab would interact with the Western Disturbance and usher light thundery weather in the northwest plains. Isolated showers are likely over Punjab, Haryana and northern parts of west Uttar Pradesh.
Western Disturbances are westerly (traveling west to east) weather systems that originate due to evaporation over the Mediterranean or the Caspian Seas.
A trough extends from sub-Himalayan West Bengal to north Bay of Bengal and would sustain rainfall over northeast, sub-Himalayan West Bengal and Sikkim. Moisture laden winds from the Bay of Bengal would follow the trough into these parts and cause rainfall.
Troughs are places where winds from opposing directions meet (or winds turn) and atmospheric pressure is low while the turbulence caused by such interaction (or turning) leads to rain, thundershowers and storms. Southwesterly winds are turning into northwesterly along this trough.
Another trough that runs off shore from Konkan to Kerala will support rainfall along the west coast. But intensity of rainfall may reduce after a couple of days in this area due to the weakening of the surge over west coast.
Scattered rain or thundershowers will continue in south peninsula and central India due to stray moisture from Arabian Sea or Bay of Bengal.
