Monsoon Update 22 July 2026 — Active Monsoon Low Drives Very Heavy Rain in Gujarat; Arabian Sea Low-Level Jet Surging; Rainfall Axis Shifting Eastward 27–31 July

The VayuMet model's 22 July 2026 run confirms the nationwide monsoon revival forecast in the 17 July run is fully materialising. An active monsoon low-pressure area is positioned over northwest India, drawing a strongly enhanced Arabian Sea Low-Level Jet (LLJ) that is +4 to +6 m/s above normal — and the result is Very Heavy Rain across Gujarat: The Dangs and Vadodara are flagged for 22 July, Banas Kantha and Patan for 23 July, with widespread Heavy Rain across much of central and north Gujarat through 23 July. This is a significant turnaround for Gujarat, which endured a prolonged rainfall deficit during the break monsoon episode of 11–18 July. Looking ahead, the rainfall axis is likely to shift eastward from 27–31 July as the Bay of Bengal system builds and the active rainfall corridor moves to Uttar Pradesh plains, West Bengal, and Odisha. Heat stress over northwest Rajasthan and Punjab, while reduced, likely persists through this period.

Chart Analysis — VayuMet Model 22 July 2026 00Z

VayuMet Model · Mean Sea Level Pressure · 22–26 July (left) and 27–31 July (right) · Contours at 2 hPa · Anomaly vs 1981–2010 NCEP R2

Mean Sea Level Pressure — Active Monsoon Low Over Northwest India; Broad Active Pattern Through 31 July

The 22–26 July panel shows a deep negative Mean Sea Level Pressure (MSLP) anomaly of −6 to −9 hPa centred over northwest India and Rajasthan, with a closed low-pressure centre near 998 hPa — the clearest possible active monsoon signature. The monsoon trough is positioned well into the plains, south of the Himalayan foothills, drawing maximum moisture from the Arabian Sea. This configuration is strongly favourable for heavy rainfall over Gujarat, Rajasthan, and the western Gangetic belt. The 27–31 July panel shows the negative anomaly broadening and becoming more uniformly distributed across India and the Bay of Bengal, indicating a transition from a western-focused active phase to a more widespread monsoon pattern through the last week of July.

VayuMet Model · 5-day Cumulative Rainfall and Anomaly vs 1991–2020 Long Term Mean · 22–26 July (left) and 27–31 July (right)

Precipitation — Gujarat and West India Bearing the Brunt 22–26 July; Eastward Shift 27–31 July

The 22–26 July rainfall panel shows a concentrated band of very heavy precipitation over Gujarat, the Konkan, and south Rajasthan, with positive anomalies of +60 to +96 mm above the Long Term Mean across this region. Northeast India and coastal Andhra Pradesh show moderate negative anomalies — the active western pattern is suppressing convection in the east for now. The 27–31 July panel marks a clear eastward shift: the positive anomaly axis moves to the sub-Himalayan belt, Uttar Pradesh plains, West Bengal, and Odisha, while Gujarat and west India quiet down. The northeast India foothills remain active throughout both periods, consistent with the persistently anchored monsoon trough.

VayuMet Model · 2 m Temperature Anomaly vs June Long Term Mean (1991–2020) · 22–26 July (left) and 27–31 July (right)

Temperature — Heat Stress Persisting Over Northwest Rajasthan and Punjab Despite Active Monsoon

The 22–26 July temperature anomaly panel shows above-normal temperatures (>8°C) persisting over northwest Rajasthan and the Pakistan border zone, while central India and the Gangetic belt see gradual cooling as the active monsoon spreads rainfall. Gujarat, receiving the heaviest rainfall, shows near-normal to below-normal temperatures at low levels. The 27–31 July panel indicates modest but progressive improvement across the northwest, as the broad negative MSLP anomaly and cloud cover spread further west. The sub-Himalayan foothills maintain a cool band throughout, sustained by continuous active rainfall.

VayuMet Model · 850 hPa Wind Speed and Anomaly vs 1991–2020 Long Term Mean · 22–26 July (left) and 27–31 July (right)

850 hPa Wind — Arabian Sea Low-Level Jet +4 to +6 m/s Above Normal; Flow Axis Shifting East 27–31 July

The 22–26 July low-level wind anomaly panel shows the most striking feature of this run: a strongly positive anomaly of +4 to +6 m/s above normal concentrated over Gujarat, the Konkan, and the Arabian Sea approach — the enhanced Arabian Sea Low-Level Jet (LLJ) that is the direct driver of the Very Heavy Rain in Gujarat. The Bay of Bengal and eastern India show a negative anomaly, explaining the relative suppression of rainfall there for 22–26 July. The 27–31 July panel shows a decisive shift: the positive anomaly migrates eastward to the Gangetic plains and northern Bay of Bengal, with the LLJ maintaining its overall strength but reorienting its delivery to the eastern half of India. Foothills flow remains strongly positive throughout.

VayuMet Model · 200 hPa Wind Speed and Anomaly vs 1991–2020 Long Term Mean · 22–26 July (left) and 27–31 July (right)

200 hPa Wind — Tibetan High Well-Placed; Upper Structure Strongly Supports Active Monsoon

The 200 hPa wind anomaly shows a negative signal (below-normal upper-level winds) across the Indian subcontinent for 22–26 July, consistent with the upper westerly jet retreating well north of India and the Tropical Easterly Jet (TEJ) providing the anticyclonic outflow needed to sustain deep monsoon convection. The Tibetan High is well-maintained at upper levels, providing the large-scale forcing that locks the monsoon into its active configuration. The 27–31 July panel shows the TEJ anomaly moderating slightly over the Bay, while the upper-level pattern remains broadly favourable for continued active monsoon. There is no upper-level signal here for a return to break monsoon conditions in the 10-day window.

Heavy Rain Alert Districts — 22–28 July 2026 (Model Guidance)

Date	State	Key Districts	Alert Level
22 Jul	Gujarat	The Dangs, Vadodara	Very Heavy
22 Jul	Gujarat	Anand, Bharuch, Navsari, Valsad	Heavy
22 Jul	Maharashtra	Palghar	Heavy
22 Jul	Dadra & Nagar Haveli / Daman	Dadra & Nagar Haveli, Daman	Heavy
22 Jul	Rajasthan	Rajsamand	Heavy
23 Jul	Gujarat	Banas Kantha, Patan	Very Heavy
23 Jul	Gujarat	Ahmadabad, Gandhinagar, Kheda, Mahesana, Morbi, Surendranagar	Heavy
23 Jul	Rajasthan	Jalor	Heavy
27 Jul	Uttar Pradesh	Agra, Budaun, Etah, Etawah, Farrukhabad, Firozabad, Ghaziabad, Hathras, Kannauj, Kasganj, Mainpuri	Heavy
27 Jul	West Bengal	Howrah, Kolkata	Heavy
28 Jul	Odisha	Jharsuguda	Heavy
28 Jul	Jharkhand	Saraikela-Kharsawan	Heavy
28 Jul	Punjab	Amritsar	Heavy

Model guidance only — verify against latest IMD district bulletins.

VayuMet Outlook — 22–31 July (Active Monsoon, Westward Then Eastward)

22–26 July:

• Gujarat under heavy to Very Heavy Rain — The Dangs, Vadodara (22 Jul) and Banas Kantha, Patan (23 Jul) flagged orange; widespread Heavy Rain across Ahmadabad, Mahesana, Kheda, and Surendranagar belt through 23 July.
• Konkan coast (Palghar, Dadra & Nagar Haveli) and south Rajasthan (Rajsamand, Jalor) also active.
• Sub-Himalayan foothills and northeast India remain continuously active throughout.
• Northeast India and Bay of Bengal relatively suppressed 22–26 July — LLJ energy focused on the western corridor.
• Northwest Rajasthan and Punjab heat stress (>8°C above normal) persisting despite active monsoon; improvement likely gradual from ~24 July.

27–31 July:

• Rainfall axis shifts eastward as low-level flow reorients from Gujarat toward the Gangetic plains and Bay.
• Uttar Pradesh plains (Agra, Etah, Firozabad, Ghaziabad belt) — Heavy Rain signals from 27 July; western UP activating as monsoon deepens over the plains.
• West Bengal (Howrah, Kolkata) and Odisha (Jharsuguda) — Heavy Rain from 27–28 July.
• Punjab (Amritsar) — Heavy Rain signal by 28 July, consistent with monsoon spreading northwest.
• Upper-level structure (Tibetan High maintained, TEJ active) shows no break monsoon signal in the 10-day window.

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