Deep depression over Gangetic West Bengal and is likely to move nearly westwards and cause isolated very heavy to extremely heavy rainfall over Jharkhand, Gangetic West Bengal, Odisha and Bihar on 15th & 16th September.

Deep Depression over Gangetic West Bengal

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

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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

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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

Monsoon Activity

(A) Criteria for describing activity of southwest monsoon
Descriptive term Specification
Weak Monsoon Rainfall less than half the normal.
Normal Monsoon Rainfall half to less than 1½ times the normal (Mention of "normal" monsoon may not be necessary in general).
Active Monsoon
  1. Rainfall 1 ½ to 4 times the normal.
  2. The rainfall in at least two stations should be 5 cm, if that sub-division is along the west coast and 3 cm, if it is elsewhere.
  3. Rainfall in that sub-division should be fairly widespread to widespread.
Vigorous Monsoon
  1. Rainfall more than 4 times the normal.
  2. The rainfall in at least two stations should be 8 cm if the sub-division is along the west coast and 5 cm if it is elsewhere.
  3. Rainfall in that sub-division should be fairly widespread or widespread.
Subdued Monsoon
  1. Spatial distribution of rainfall remains dry, isolated or scattered for two consecutive days.
  2. Mean actual rainfall of that particular sub-division remains less than the normal for the consecutive two days.
  3. The Forecast issued for the next 48 hrs on the particular day for the sub-division is also dry, isolated or scattered. Upon satisfying all the above criteria simultaneously, monsoon activity be described as subdued on the second day.
Notes:
  1. While describing the activity of the monsoon:
    1. The normals of stations, whenever available should be used.
    2. Till normals for all the stations are available the following procedure should be adopted:
       Number of stations in a sub-division with normals  - a
       Normal for these stations -  b
       Average normal for the sub-division -  b/a
       Total number of stations reporting rainfall  - c
       Actual total rainfall reported by these stations  - d
       Therefore, the average rainfall for the sub-division -  d/c
       Compare d/c with b/a and describe the activity of the monsoon accordingly, other conditions being fulfilled.
      													
  2. In the sub-divisions, where the percentage of hill stations is high, the hill stations must be also taken into account for describing the activity of the monsoon. In other sub-divisions, the hill stations will be excluded.
  3. The monsoon activity will be described in all the sub-divisions of northeast India as is done for sub-divisions of other regions.
  4. The monsoon activity need not be described over the Bay Islands and the Arabian Sea Islands.
(B) Criteria for describing the activity of Northeast Monsoon.
Descriptive term Specification
Weak Monsoon Rainfall less than half the normal.
Normal Monsoon Rainfall half to less than one and a half (1½) times the normal.
Active Monsoon
  1. Rainfall 1½ to 4 times the normal.
Vigorous Monsoon
  1. Rainfall in that sub-division should be fairly widespread to widespread.
  2. Rainfall in at least two stations should be 5 cm in coastal Tamil Nadu and south coastal Andhra Pradesh and 3 cm elsewhere.
  3. Rainfall in that sub-division should be fairly widespread or widespread.