Extremely heavy falls very likely over Kerala, Coastal & South Interior Karnataka, Konkan, Goa & Madhya Maharashtra during next 4-5 days.

Press Release dated 21.06.2024: Heavy to very heavy rainfall very likely over Kerala, Coastal & South Interior Karnataka, Konkan-Goa during next 5 days.

Current Weather Status and Extended range Forecast for next two weeks (20 June-3 July, 2024)

Press Release: Monthly forecast update for June 2024.

अखिल भारतीय अंतर मंत्रालय / अंतर विभागीय हिंदी संगोष्ठी 2024- संशोधित अंतिम तिथि

Current Weather Status and Extended range Forecast for next two weeks (6 -19 June 2024)

2024 दक्षिण-पश्चिम मॉनसून सीज़न (जून-सितंबर) वर्षा के लिए अद्यतन दीर्घावधि पूर्वानुमान आउटलुक और जून 2024 के लिए मासिक व

Updated Long Range Forecast Outlook for the 2024 Southwest Monsoon Season (June - September) Rainfall and Monthly Rainfall and Temperature for June 2024.

अखिल भारतीय अंतर मंत्रालय / अंतर विभागीय हिंदी संगोष्ठी का आयोजन

भारत मौसम विज्ञान विभाग का विकास

Evolution of India Meteorological Department

Monsoon Information | Onset

Onset & Advance of Monsoon

The guidelines to be followed for declaring the onset of monsoon over Kerala and its further advance over the country are enlisted below:

a) Rainfall

If after 10th May, 60% of the available 14 stations enlisted*, viz. Minicoy, Amini, Thiruvananthapuram, Punalur, Kollam, Allapuzha, Kottayam, Kochi, Thrissur, Kozhikode, Thalassery, Kannur, Kudulu and Mangalore report rainfall of 2.5 mm or more for two consecutive days, the onset over Kerala be declared on the 2nd day, provided the following criteria are also in concurrence.

b) Wind field

Depth of westerlies should be maintained upto 600 hPa, in the box equator to Lat. 10ºN and Long. 55ºE to 80ºE. The zonal wind speed over the area bounded by Lat. 5-10ºN, Long. 70-80ºE should be of the order of 15 – 20 Kts. at 925 hPa. The source of data can be RSMC wind analysis/satellite derived winds.

c) Outgoing Longwave Radiation (OLR)

INSAT derived OLR value should be below 200 wm-2 in the box confined by Lat. 5-10ºN and Long. 70-75ºE.

Northern Limit of Monsoon (NLM)

Southwest monsoon normally sets in over Kerala around 1st June. It advances northwards, usually in surges, and covers the entire country around 15th July. The NLM is the northern most limit of monsoon upto which it has advanced on any given day.