Southwest Monsoon covers the entire country today, the 26th June 2020: IMD

• The normal date for Southwest Monsoon to cover the entire country is 8th July. Therefore, the Southwest Monsoon this year has covered the entire country 12 days prior to normal date
• Earlier, the Southwest Monsoon covered the entire country on 16th June during 2013
• The early advance over the central & northwest India was facilitated by the formation of a low-pressure area over Bay of Bengal which moved west-northwestwards and another cyclonic circulation over central India

The National Weather Forecasting Centre/Regional Meteorological Centre, New Delhi of the India Meteorological Department (IMD) has said:
 

• Southwest Monsoon covered the entire country today, the 26th of June 2020.
• The Southwest Monsoon has further advanced into the remaining parts of Rajasthan, Haryana, and Punjab and thus it has covered the entire country today, the 26th June 2020(Fig. 1).
• The normal date for Southwest Monsoon to cover the entire country is 8th July. Therefore, the Southwest Monsoon this year has covered the entire country 12 days prior to the normal date.
• In the recent past, such early coverage of Southwest Monsoon over the entire country occurred in 2013, The Southwest Monsoon covered the entire country on 16th June during 2013.
• During the past 24 hours, there has been fairly widespread rainfall activity over WestRajasthan and adjoining Punjab & Haryana in association with cyclonic circulation at lower tropospheric levels over the northeast Rajasthan.
• Considering southwest monsoon onset and advance over the country as a whole, there has been normal progress over the south and east India, about a week delay advance over northeast India and about 7-12 days early advance over central & northwest India. The early advance over the central & northwest India was facilitated by the formation of a low-pressure area over Bay of Bengal which moved west-northwestwards and another cyclonic circulation over central India.

 
Meanwhile,
Update for ongoing intense southwest monsoon rainfall spell over northeast & adjoining east India
Current Meteorological Conditions

• Eastern end of the monsoon trough at mean sea level lies close to foothills of Himalayas.
• Another trough runs from Bihar to east Vidarbha at 3.1 km above mean sea level. It is likely to persist till tomorrow.
• There is high convergence of strong moist southerlies/southwesterly winds from the Bay of Bengal over northeast & adjoining east India and the same is likely to continue for the next 2-3 days. .Forecast & Warnings
•  With the above favorable meteorological conditions, the enhanced rainfall/thundershowers activity is most likely to continue over the northeastern states &adjojinig east India during 26th & 28th June with light to moderate widespread rainfall over Bihar, Sub-Himalayan West Bengal & Sikkim, Arunachal Pradesh, Assam, Meghalaya, Nagaland, Manipur, Mizoram & Tripura and decrease in spread &intensity thereafter.
• Heavy to very heavy rainfall at a few places with extremely heavy falls (≥ 20 cm) at isolated places very likely over Sub-Himalayan West Bengal & Sikkim on 26th & 27th and isolated heavy to very heavy falls on28th June 2020.
• Heavy to very heavy rainfall at isolated places with extremely heavy falls very likely over Assam &Meghalaya on 26th & 27th, isolated heavy to very heavy falls on 28th and isolated heavy falls on 29th June 2020.
• Heavy to very heavy rainfall at isolated places with extremely heavy falls very likely over Bihar on 26th &27th, isolated heavy to very heavy falls on 28th and isolated heavy falls on 29th June 2020.
• Isolated heavy to very heavy falls is also very likely over Arunachal Pradesh on 26th & 27th and isolated heavy falls on 28th June 2020.