Deep Depression over Gangetic West Bengal and adjoining Bangladesh.

Press Release dated 14.09.2024: Deep depression over Gangetic West Bengal and adjoining Bangladesh is likely to move west-northwestwards.

CURRENT WEATHER STATUS AND EXTENDED RANGE FORECAST FOR NEXT TWO WEEKS (5-18 SEPT, 2024)

Current Weather Status and Extended range Forecast for next two weeks (5-18 Sept, 2024)

AOMSUC-14 conference

ONLINE WORKSHOP ON CLIMATE SERVICES FOR THE NATIONAL ADAPTATION PLANS 9 - 12 Dec 2024

7ᵗʰ Conference on India Radar Meteorology (iRAD2025)

VinFuture Prize 2025- Call for nominations

Call for abstracts for the Science and Technology (S&T) workshop

प्रेस विज्ञप्ति : ऋतु के दूसरे भाग और अगस्त 2024 के महीने के लिए दक्षिण-पश्चिम मानसून वर्षा का पूर्वानुमान

Press release: Southwest monsoon rainfall Forecast for the second half of the season and for the month of August 2024

VIRTUAL PRESS CONFERENCE ON “OUTLOOK FOR SOUTHWEST MONSOON RAINFALL DURING SECOND HALF OF MONSOON SEASON AND MONTHLY OUTLOOK FOR RAINFALL & TEMPERATURE DURING AUGUST 2024.

Call for abstracts regarding TROPMET 2024

Shri Amarnath Yatra 2024

TO VIEW WETHER INFORMATION ON MOBILE, PLEASE DOWNLOAD MAUSAM MOBILE APP

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.

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.