Virtual Press Conference on Salient features of Southwest Monsoon 2023 and forecast for Oct-Dec. 2023 at 1600 hrs IST of tomorrow, the 30th September, 2023.

Press Release: A Low Pressure Area lies over Eastcentral Arabian Sea off south Konkan-Goa coasts and another Low Pressure Area lies over Northeast & adjoining Eastcentral Bay of Bengal.

Press Release Current Weather Status and Extended range Forecast for next two weeks (28 Sept-11 Oct 2023)

Press release dated 28.09.2023: A low pressure area is likely to form over Eastcentral & adjoining Northeast Bay of Bengal during next 24 hours.

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Press Release: Current Weather Status and Extended range Forecast for next two weeks (21-28 Sept 2023)

Current Weather Status and Extended range Forecast for next two weeks (7-20 Sept 2023)

Press release: Climate Summary for the month of August 2023

प्रेस विज्ञप्ति: सितंबर 2023 के लिए मासिक वर्षा और तापमान हेतु पूर्वानुमान आउटलुक

PRESS RELEASE DATED 31.08.2023: FORECAST OUTLOOK FOR THE MONTHLY RAINFALL AND TEMPERATURE FOR SEPTEMBER 2023.

Current Weather Status and Extended range Forecast for next two weeks (13-26 July 2023)

WMO VIRTUAL WORKSHOP ON ENVIRONMENTAL SUSTAINABILITY

Climate Summary for the month of June 2023

जुलाई, 2023 के लिए मासिक वर्षा और तापमान आउटलुक

Monthly Rainfall and Temperature Outlook for July, 2023

Press Release: Updated Long Range ForecastOutlook for the 2023Southwest Monsoon Season (June - September) Rainfall and Monthly Rainfall and Temperature for June 2023

प्रेस विज्ञप्ति: 2023 दक्षिण-पश्चिम मॉनसून ऋतु (जून-सितंबर) कीवर्षाके लिए अद्यतन दीर्घावधिपूर्वानुमानदृष्टिकोणऔर

2023 दक्षिण पश्चिम मानसून ऋतु वर्षा के लिए दीर्घावधि पूर्वानुमान

Long Range Forecast for the 2023 Southwest Monsoon Season Rainfall

Spokesperson of IMD to brief press and electronic media on weather forecasting.

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.