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WWIN40 DEMS 130300

IWB (MORNING) DATED 13-05-2025



METEOROLOGICAL ANALYSIS:

 WIDESPREAD MODERATE RAINFALL WITH HEAVY RAINFALL AT A FEW PLACES

OCCURRED OVER THE

NICOBAR ISLANDS DURING PAST 24 HOURS. THUS, THE WIDESPREAD RAINFALL

WITH ISOLATED/SCATTERED

HEAVY RAINFALL CONTINUED OVER THE NICOBAR ISLANDS DURING PAST 2 DAYS.

THE STRENGTH AND

DEPTH OF WESTERLY WIND INCREASED CONTINUOUSLY DURING PAST 2 DAYS OVER

PARTS OF SOUTH BAY

OF BENGAL, NICOBAR ISLANDS AND ANDAMAN SEA. THE WESTERLY WIND SPEED

AT 1.5 KM ABOVE MEAN

SEA LEVEL IS ABOVE 20 KNOTS AND THE DEPTH OF WESTERLY WIND OVER SOME

PARTS OF SOUTH BAY,

NICOBAR ISLANDS AND SOME PARTS OF ANDAMAN SEA IS UPTO 4.5 KM ABOVE

MEAN SEA LEVEL. THE

OUTGOING LONGWAVE RADIATION OVER THE AREA CONTINUED TO DECREASE

BECOMING LESS THAN 200

W/M2 DURING PAST 2 DAYS (190 &170 W/M2 ON 12TH & 13TH MAY, 2025).

 CONSIDERING ALL THE ABOVE SATISFIED CRITERIA, SOUTHWEST MONSOON HAS

ADVANCED INTO SOME

PARTS OF SOUTH BAY OF BENGAL, SOUTH ANDAMAN SEA, NICOBAR ISLANDS AND

SOME PARTS OF NORTH

ANDAMAN SEA TODAY, THE 13TH



MAY, 2025. THE NORTHERN LIMIT OF MONSOON PASSES THROUGH



5ON/75OE, 5ON/80OE, 6ON/86OE, 8.5ON/90OE, HUT BAY, 13ON/95OE. AND

16ON/98OE.

 CONDITIONS ARE FAVORABLE FOR FURTHER ADVANCE OF SOUTHWEST MONSOON

OVER SOME PARTS OF

SOUTH ARABIAN SEA, MALDIVES & COMORIN AREA; SOME MORE PARTS OF SOUTH

BAY OF BENGAL, ENTIRE

ANDAMAN & NICOBAR ISLANDS, REMAINING PARTS OF ANDAMAN SEA; AND SOME

PARTS OF CENTRAL BAY

OF BENGAL DURING NEXT 3-4 DAYS.

 THE WESTERN DISTURBANCE AS A TROUGH ALOFT IN MIDDLE & UPPER

TROPOSPHERIC WESTERLIES WITH

ITS AXIS AT 5.8 KM ABOVE MEAN SEA LEVEL NOW RUNS ROUGHLY ALONG LONG.

73OE TO THE NORTH OF

LAT. 32ON.

 THE TROUGH FROM SAURASHTRA TO EASTCENTRAL ARABIAN SEA ACROSS NORTH

EAST ARABIAN SEA

PERSISTS AND NOW SEEN BETWEEN 3.1 & 5.8 KM ABOVE MEAN SEA LEVEL.

 THE UPPER AIR CYCLONIC CIRCULATION OVER UTTARAKHAND & NEIGHBOURHOOD

PERSISTS AND NOW

SEEN AT 1.5 KM ABOVE MEAN SEA LEVEL.

 AN UPPER AIR CYCLONIC CIRCULATION LIES OVER EAST UTTAR PRADESH &

ADJOINING BIHAR AT 0.9 KM

ABOVE MEAN SEA LEVEL.

 A TROUGH RUNS FROM ABOVE CYCLONIC CIRCULATION OVER EAST UTTAR

PRADESH & ADJOINING BIHAR

TO SOUTH ODISHA ACROSS CHHATTISGARH AT 0.9 KM ABOVE MEAN SEA LEVEL.

 THE UPPER AIR CYCLONIC CIRCULATION OVER NORTHEAST ASSAM &

NEIGHBOURHOOD EXTENDING UPTO

1.5 KM ABOVE MEAN SEA LEVEL PERSISTS.

 AN UPPER AIR CYCLONIC CIRCULATION LIES OVER ANDAMAN SEA BETWEEN 1.5

& 7.6 KM ABOVE MEAN

SEA LEVEL TILTING SOUTHWESTWARDS WITH HEIGHT.

 A TROUGH RUNS FROM WEST VIDARBHA TO NORTH KERALA ACROSS MARATHWADA &

INTERIOR

KARNATAKA AT 1.5 KM ABOVE MEAN SEA LEVEL.

 THE UPPER AIR CYCLONIC CIRCULATION OVER SOUTHERN PARTS OF MARATHWADA

& NEIGHBOURHOOD

EXTENDING UPTO 1.5 KM ABOVE MEAN SEA LEVEL HAS MERGED WITH THE ABOVE

TROUGH.

 THE UPPER AIR CYCLONIC CIRCULATION OVER CENTRAL PAKISTAN & ADJOINING

WEST RAJASTHAN AT 1.5

KM ABOVE MEAN SEA LEVEL HAS BECOME LESS MARKED.



RAINFALL FORECAST:

 AT MOST PLACES OVER ANDAMAN & NICOBAR ISLANDS, ARUNACHAL PRADESH,

ASSAM & MEGHALAYA,

NAGALAND, MANIPUR, MIZORAM & TRIPURA, SUB-HIMALAYAN WEST BENGAL &

SIKKIM, KARNATAKA;

 AT MANY PLACES OVER COASTAL ANDHRA PRADESH & YANAM, TELANGANA,

RAYALASEEMA, KERALA & MAHE,

LAKSHADWEEP;

 AT A FEW PLACES OVER GANGETIC WEST BENGAL, VIDARBHA, CHHATTISGARH,

TAMIL NADU, PUDUCHERRY &

KARAIKAL;

 AT ISOLATED PLACES 0VER ODISHA, BIHAR, UTTARAKHAND, HIMACHAL

PRADESH, RAJASTHAN, MADHYA PRADESH,

GUJARAT STATE, KONKAN & GOA, MADHYA MAHARASHTRA, MARATHWADA;

 DRY WEATHER OVER REST PARTS OF THE COUNTRY.

WEATHER WARNINGS:

13TH

MAY (DAY 1)

 HEAVY TO VERY HEAVY RAINFALL WITH ISOLATED EXTREMELY HEAVY RAINFALL

VERY LIKELY AT ISOLATED PLACES

OVER ASSAM & MEGHALAYA.

 HEAVY TO VERY HEAVY RAINFALL VERY LIKELY AT ISOLATED PLACES OVER

ANDAMAN & NICOBAR ISLANDS,

ARUNACHAL PRADESH, NAGALAND, MANIPUR, MIZORAM AND TRIPURA AND SUB

HIMALAYAN WEST BENGAL &

SIKKIM.

 HEAVY RAINFALL VERY LIKELY AT ISOLATED PLACES OVER ANDHRA PRADESH,

COSTAL KARNATAKA, INTERIOR

KARNATAKA, KERALA AND MAHE, MADHYA MAHARASHTRA AND TAMILNADU &

PUDUCHERRY.

 THUNDERSTORM ACCOMPANIED WITH HAILSTORM VERY LIKELY AT ISOLATED

PLACES OVER TELANGANA.

 THUNDERSQUALL WITH WIND SPEED REACHING(50-60KMPH) VERY LIKELY AT

ISOLATED PLACES OVER ANDHRA

PRADESH, ASSAM & MEGHALAYA, INTERIOR KARNATAKA, MADHYA MAHARASHTRA,

MARATHWADA AND

TELANGANA.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING & GUSTY WINDS(40-50KMPH)

VERY LIKELY AT ISOLATED PLACES

OVER CHHATTISGARH, GUJARAT, KERALA AND MAHE, KONKAN & GOA, NAGALAND,

MANIPUR, MIZORAM AND

TRIPURA, ODISHA, RAJASTHAN, TAMILNADU & PUDUCHERRY, VIDARBHA AND WEST

BENGAL & SIKKIM.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING & GUSTY WINDS(30-40KMPH)

VERY LIKELY AT ISOLATED PLACES

OVER BIHAR, JAMMU AND KASHMIR AND LADAKH AND WEST MADHYA PRADESH.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING VERY LIKELY AT ISOLATED

PLACES OVER ARUNACHAL PRADESH,

COSTAL KARNATAKA AND LAKSHADWEEP.

 DUST STORM VERY LIKELY AT ISOLATED PLACES OVER WEST RAJASTHAN.

 HOT AND HUMID WEATHER VERY LIKELY AT ISOLATED PLACES OVER GANGETIC

WEST BENGAL, JHARKHAND, ODISHA

AND TAMILNADU & PUDUCHERRY.

 SQUALLY WIND WITH SPEED 45 KMPH TO 50 KMPH GUSTING TO 55 KMPH VERY

LIKELY TO PREVAIL ALONG AND OFF

SOMALIA COAST, OVER GULF OF MANNAR; ADJOINING COMORIN AREA, ALONG AND

OFF SOUTH SRI LANKA COAST;

ADJOINING SOUTHWEST BAY OF BENGAL; SQUALLY WEATHER WITH WIND SPEED 35

KMPH TO 45 KMPH GUSTING TO

55 KMPH PREVAILING OVER ANDAMAN SEA; ADJOINING PARTS OF SOUTHEAST BAY

OF BENGAL. FISHERMEN ARE

ADVISED NOT TO VENTURE INTO THESE AREAS.

14TH

MAY (DAY 2)



 HEAVY TO VERY HEAVY RAINFALL WITH ISOLATED EXTREMELY HEAVY RAINFALL

VERY LIKELY AT ISOLATED PLACES

OVER ASSAM & MEGHALAYA.

 HEAVY TO VERY HEAVY RAINFALL VERY LIKELY AT ISOLATED PLACES OVER

ARUNACHAL PRADESH.

 HEAVY RAINFALL VERY LIKELY AT ISOLATED PLACES OVER ANDAMAN & NICOBAR

ISLANDS, ANDHRA PRADESH,

COSTAL KARNATAKA, INTERIOR KARNATAKA, KERALA AND MAHE, NAGALAND,

MANIPUR, MIZORAM AND TRIPURA,

SUB HIMALAYAN WEST BENGAL & SIKKIM AND TAMILNADU & PUDUCHERRY.

 THUNDERSTORM ACCOMPANIED WITH HAILSTORM VERY LIKELY AT ISOLATED

PLACES OVER TELANGANA.

 THUNDERSQUALL WITH WIND SPEED REACHING(50-60KMPH) VERY LIKELY AT

ISOLATED PLACES OVER

CHHATTISGARH, COASTAL ANDHRA PRADESH, MAHARASHTRA AND TELANGANA.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING & GUSTY WINDS(40-50KMPH)

VERY LIKELY AT ISOLATED PLACES

OVER ASSAM & MEGHALAYA, EAST RAJASTHAN, INTERIOR KARNATAKA, KERALA

AND MAHE, KONKAN & GOA,

NAGALAND, MANIPUR, MIZORAM AND TRIPURA, ODISHA, RAYALASEEMA,

TAMILNADU & PUDUCHERRY AND WEST

MADHYA PRADESH.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING & GUSTY WINDS(30-40KMPH)

VERY LIKELY AT ISOLATED PLACES

OVER BIHAR, EAST MADHYA PRADESH, GUJARAT AND WEST BENGAL & SIKKIM.

 THUNDERSTORM ACCOMPANIED WITH LIGHTNING VERY LIKELY AT ISOLATED

PLACES OVER ARUNACHAL PRADESH

AND COSTAL KARNATAKA.

 HEAT WAVE CONDITIONS VERY LIKELY AT ISOLATED PLACES OVER EAST UTTAR

PRADESH, GANGETIC WEST BENGAL

AND JHARKHAND.

 HOT AND HUMID WEATHER VERY LIKELY AT ISOLATED PLACES OVER BIHAR,

ODISHA AND TAMILNADU &

PUDUCHERRY.

 SQUALLY WIND WITH SPEED 45 KMPH TO 50 KMPH GUSTING TO 55 KMPH VERY

LIKELY TO PREVAIL ALONG AND OFF

SOMALIA COAST, OVER GULF OF MANNAR; ADJOINING COMORIN AREA, ALONG AND

OFF SOUTH SRI LANKA COAST;

ADJOINING SOUTHWEST BAY OF BENGAL. SQUALLY WEATHER WITH WIND SPEED 35

KMPH TO 45 KMPH GUSTING TO

55 KMPH PREVAILING OVER ANDAMAN SEA; ADJOINING PARTS OF SOUTHEAST BAY

OF BENGAL. FISHERMEN ARE

ADVISED NOT TO VENTURE INTO THESE AREAS.=