New Delhi, Wednesday, June 27 Monsoon has remained practically stationary during the last four days. Monsoon rains over east India have also reduced considerably, especially Bihar, Jharkhand, Orissa and Chhattisgarh. Chances of revival of monsoon in the near future are very bleak due to the absence of any weather system over head Bay of Bengal.
The trough extending from sub-Himalayan West Bengal to north Bay of Bengal persists and would give a shot in the arm to rainfall over northeast and northern parts of West Bengal. 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.
The Western Disturbance over north Pakistan and adjoining Jammu & Kashmir will support scattered rainfall in the Jammu & Kashmir region, Himachal Pradesh and Uttaranchal. A cyclonic circulation lies over Punjab and neighborhood as well and would interact with the Western Disturbance. The weather system would attract some moisture that would be conducive for isolated showers 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.
The off shore trough (at mean sea level) prevails from Konkan to Kerala that is supporting continuous rainfall over 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.
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.
