Co Authors: GSB, Shreyas Dhavale, Pradeep John, Dr. Vineet Singh, Gokul

Friday, May 15, 2026

15th Night Post

South West Monsoon Announcement # 3

South West Monsoon Advances into South Andaman Islands as a weak current..15th May.




Bulletin of Thai Met Dept. 

"The southwest monsoon prevails over the Andaman Sea and the South with more rain and isolated heavy rain in the upper country, while isolated very heavy rain is likely in the North, the Central, and the East."

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13 May observed wind speed during squall and observed lightning strikes

Meerut saw a whopping strike of 519 in 1hr

Unnao massive  952 strikes in 1hr

Raebareilly 655 lightning strikes in 1hr


Observed windspeed in UP on 13may


Monsoon Watch - 4 on blog tomorrow 16th





Thursday, May 14, 2026

 Southwest Monsoon Announcement # 2

The South-West Monsoon will advance in the Andamans Region by 16th May. 


Bulletin from Thai Met Office dt 14th:
 "Weather Advisory

Subject: Heavy to very heavy rains in Thailand,

Strong Wind-Waves in the upper Andaman Sea

No. (64/2026)

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The active low-pressure cell in lower Bay of Bengal will move to the upper Bay of Bengal while the southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf will strengthen."



Meanwhile 

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Tuesday, May 12, 2026

South West Monsoon Announcement # 1

12th May Night Post: 

A weak low (BB 1) forms in BoB, displacing the anticyclone. 

This is likely to intensify a little and open the doors for the cross equatorial flow to enter southern BoB.

SWM 2026 onset over Andaman & Nicobar islands likely by 15th/16th May as a weak current.

Estimated winds on 15th: 👇

As BB 1 moves NE, rainfall will reduce over the Islands, hence weak current.

Arabian Sea anticyclone also weakens, but ridging persists.

As the Somali current intensifies, and the SST drops along the Somali Coast in the last week of May, pre monsoon thundershowers can commence along Keralam and Coastal Karnatak by May end

Note and images compiled by Vagarian Shreyas.

South West Monsoon Announcement #1
Here by 11.30 pm IST today
 


Monday, May 11, 2026

Mumbai.. Month of May facts and observations:

(Please see on mobile in horizontal view) 

Hearing a lot of whispers, shouts and complains about Mumbai being " too hot", specially this year. 

Well, it's a lot about the " over enthusiastic" social sites by several forecasters. 

Vagaries simply clarifies with facts about Mumbai's May temperatures over the last 130 years ! ( Santacruz observations started in 1953).


May (Max) Days average over the years. (mobile on horizontal view) 

                         Colaba.      Scruz

1892-1901        32.6c.       No Observations 

1953-1962        33.6c        33.1c

1963 - 1968                       33.3c

2016-2025        34.4c.       34.1c

2026.                 34.4c        34.3c   (May 1-11th)

Conclusion:: Average of May this year (2026) is equal to average of May since 2016.

This year May as yet is definitely 0.8°c warmer than what we see 50/60 years ago.. 

And warmer by 1.8°c from 125 years back

All Details of recorded observations compiled by Vag. Shitij Jain (Surat)





Sunday, May 10, 2026

मराठवाड्यासाठी प्राथमिक मान्सून व कृषी अंदाज – २०२६... 10th May 

(शेतकरी व कृषी नियोजनासाठी मार्गदर्शक सूचना)

सध्या मराठवाड्यातील हवामानाची स्थिती पाहता, मे २०२६ च्या बहुतांश कालावधीत नेहमीप्रमाणे उन्हाळी वातावरण कायम राहण्याची शक्यता आहे. अनेक जिल्ह्यांमध्ये कमाल तापमान ४०°C ते ४२°C दरम्यान राहू शकते.

सध्या व्यापक पावसाची शक्यता कमी आहे. पुढील दोन आठवड्यांत जर पाऊस किंवा मेघगर्जनेसह वादळी पाऊस झाला, तरी तो स्थानिक, विखुरलेला आणि सौम्य स्वरूपाचा असण्याची शक्यता आहे. त्यामुळे शेतकऱ्यांनी केवळ या पूर्वमान्सून पावसावर अवलंबून राहून मोठ्या प्रमाणावर शेतीची तयारी करू नये.

पूर्वमान्सून व मान्सून अंदाज

जूनच्या पहिल्या आठवड्यापासून पूर्वमान्सून मेघगर्जना व वादळी पावसाची तीव्रता हळूहळू वाढण्याची शक्यता आहे. सध्याच्या हवामान विश्लेषणानुसार आणि उपलब्ध संकेतांनुसार, दक्षिण-पश्चिम मान्सून मराठवाड्यात साधारण १५ जूनच्या आसपास दाखल होण्याची शक्यता आहे.

यामुळे खरीप हंगामासाठी सुमारे ३.५ महिन्यांचा प्रभावी पिकांचा कालावधी उपलब्ध राहू शकतो.

हंगामी पावसाचा अंदाज

दीर्घकालीन हवामान अंदाज आणि सध्याच्या वातावरणीय स्थितीनुसार, २०२६ चा मान्सून मराठवाड्यात सामान्य ते किंचित कमी राहण्याची शक्यता आहे.

जून आणि जुलै महिन्यातील पाऊस सामान्य ते किंचित कमी राहू शकतो. काही भागांत पावसाचे वितरण असमान राहण्याची शक्यता आहे.

ऑगस्ट आणि सप्टेंबर महिन्यांत सरासरीपेक्षा कमी पावसाची शक्यता तुलनेने अधिक आहे.

मराठवाड्याचा सरासरी हंगामी पाऊस साधारण 825 मिमी आहे.

सध्याच्या प्राथमिक अंदाजानुसार, यंदा पाऊस साधारण 10% कमी, म्हणजेच 745 ते 770 मिमी दरम्यान राहू शकतो.

शेतकऱ्यांसाठी सूचना

*केवळ एखाद्या स्थानिक पूर्वमान्सून सरींवर आधारित फार लवकर पेरणी करण्याचे टाळावे.

*पाणी साठवण व मातीतील ओलावा टिकवून ठेवण्यासाठी आवश्यक उपाययोजना कराव्यात.

*कमी ते मध्यम पावसाच्या शक्यतेचा विचार करून पिकांची निवड करावी.

*ज्या ठिकाणी सिंचनाची सुविधा आहे, तेथे पाण्याचा काटकसरीने व नियोजनपूर्वक वापर करावा.

मान्सून आगमनाची प्रगती:

जूनमधील पावसाचे वितरण,आणि सुधारित हंगामी पावसाचा अंदाज

यासंदर्भातील अधिक सविस्तर माहिती मे २०२६ च्या अखेरीस दिली जाईल.


>मे महिन्याच्या शेवटच्या १० दिवसांत हवामानात कोणताही महत्त्वाचा बदल झाल्यास, त्याची माहिती वेळोवेळी अद्ययावत करण्यात येईल


Preliminary Monsoon & Agricultural Outlook for Marathwada – 2026

(Guidance Note for Farmers & Agricultural Planning)

The current weather pattern across Marathwada indicates continuation of typical summer conditions during most of May 2026. Day temperatures are expected to remain in the range of 40°C to 42°C across several districts.

At present, the possibility of widespread rainfall remains low. Any rain or thunderstorm activity during the next two weeks is likely to be localized, scattered, and generally non-severe in nature. 

Hence, farmers are advised not to depend on pre-monsoon showers for major agricultural preparations at this stage.

Pre-Monsoon & Monsoon Outlook

Pre-monsoon thunderstorm activity is 

expected to gradually increase during the 

first week of June. Based on current 

analysis and prevailing indicators, the 

South-West Monsoon is expected to reach 

Marathwada around mid-June, approximately near 15th June.

This gives an estimated effective crop 

season window of around 3.5 months for 

the summer monsoon agricultural cycle.

Seasonal Rainfall Estimate

Long-range weather models and present climatic indicators suggest that the 2026 monsoon rainfall over Marathwada may remain near normal to slightly below normal.

Rainfall during June and July is expected to remain normal to slightly lower than normal, with uneven distribution possible at times.

There is a comparatively higher probability of below-normal rainfall during August and September.

The seasonal normal rainfall for Marathwada is approximately 825 mm.

Current preliminary estimates indicate rainfall may remain around 10% below normal, giving a likely seasonal total of approximately 725–770 mm.

Advisory for Farmers

*Farmers are advised to plan sowing schedules cautiously and avoid very early sowing based solely on isolated pre-monsoon showers.

*Water conservation and soil moisture retention measures should be prioritized.

*Crop selection may preferably consider moderate rainfall scenarios and possible late-season rainfall reduction.

*Irrigation resources, where available, should be managed carefully considering the present outlook.

A more detailed update regarding:

Monsoon onset progress,

June rainfall distribution,

and revised seasonal rainfall estimates will be issued by the end of May 2026.

If there are any significant changes in the weather pattern during the last 10 days of May, timely updates will be communicated accordingly.

Friday, May 08, 2026

Vagaries Weather Outlook for Weekend - 9th/10th May :

 9th May Night Post

👇 No Warnings... All Temperatures in +_ 1° of normal range. 

Mumbai : Hot and humid.. Making Real Feel of 39°.. 

Day: 35° [1° more than normal ] ... Night : 28°  [2° More than normal] 

Pune: Sunny, some clouds by evening. Real feel 41°

Day : 39°... Night 24°  [Both 1°above normal] 

Jalgaon : Hot temperature,  

Day: 42° [normal range.] ...Night: 24° [2° below the normal ] 

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Some Selected News Reports from today ( 8th)👇








[Just saying.. 😃😆] 





15th Night Post South West Monsoon Announcement # 3 South West Monsoon Advances into South Andaman Islands as a weak current..15th May. Bull...