New Delhi, Tuesday June 26 A slight respite is around the corner as day temperatures may dip marginally over the northwest plains. A Western Disturbance is expected over Jammu & Kashmir and would cause isolated thundery activity towards evening or early morning hours. The days would be mostly clear.
Western Disturbances are westerly (traveling west to east) weather systems that originate due to evaporation over the Mediterranean or the Caspian Seas.
Stagnation in monsoon continues even as the Northern Limit of Monsoon (NLM) continues to pass through Veraval, Navasari, Malegaon, Betul, Jabalpur, Siddhi, Varanasi and Gorakhpur. The northern limit of monsoon is an imaginary line that connects places where the monsoon has reached at a given point in time.
A cyclonic circulation is seen over east Bihar and adjoining sub-Himalayan West Bengal and a north-south trough extends from this system to north Bay of Bengal. The presence of the trough would preserve rainfall over sub-Himalayan West Bengal and northeast India for the next forty eight hours. But rainfall is likely to be subdued over Gangetic West Bengal due to insufficient moisture in these parts.
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.
The off-shore west coast trough is seeing a rebuilding as southwesterly winds are concentrating between Konkan and north coastal Maharashtra. Enhanced rainfall activity is likely in the region under the aegis of the rejuvenated trough.
Light to moderate showers are expected along the area over the next couple of days with isolated heavy showers. Rainfall in Mumbai however was limited to a millimeter today as the southwesterly surge did not reach the region as expected. A spike in rainfall is expected over the metropolis during the next twenty four to forty eight hours. Rest of west coast would continue with light showers.
A trough from Telangana to coastal Tamil Nadu persists but is mostly devoid of moisture. North coastal Andhra Pradesh and north coastal Tamil Nadu may expect light rain under its influence as some moisture is merging with the trough from the Bay of Bengal. North coastal Andhra Pradesh may beget moderate rains as well.
Some residual moisture prevailing in central India would continue light rain. The moisture levels have increased over Gujarat, Rajasthan, Punjab and Haryana due to penetration of moist southwesterly winds.
