July 2026
In short: India's places in the news and physical geography this month — distilled for SI/Constable Prelims.
Current Affairs — India › Geography · 11 min read · Free to read · English & Telugu
Bilingual study notes for the Andhra Pradesh Police SI & Constable exams (SLPRB AP) by AP Police Hub, a product of Anvil Academy.
India's erratic 2026 monsoon left a 16% national rainfall deficit even as Assam flooded and Gujarat's Umergam (Valsad) logged the country's third-highest-ever 24-hour rainfall, while a satellite study flagged fast-growing, high-risk glacial lakes above Tawang, Arunachal Pradesh.
July 2026 — At a Glance
This month's genuinely fresh Geography content sat entirely outside the usual 'places in the news' atlas and Western Ghats Eco-Sensitive Area story — both already carried in the Science digest — inside the physical geography of the monsoon itself. India's southwest monsoon left a national rainfall deficit of 16% by 27 July, with sharp regional swings: Meghalaya recorded a 56% deficit while Ladakh saw a 196% surplus. Assam, itself 30% deficit for the season, still flooded across 12 districts as short, intense downpours overwhelmed its rivers. Gujarat's Umergam town in Valsad district logged 1,064 mm of rain in 24 hours on 23 July — the third-highest daily rainfall ever recorded in India. And far to the northeast, a satellite study of glacial lakes above Tawang, Arunachal Pradesh, found four of five monitored lakes expanding, keeping alive memories of Sikkim's catastrophic 2023 glacial lake outburst flood.
1. India's Erratic 2026 Monsoon
A deficit year, unevenly spread
- The national picture — The southwest monsoon, which set in on 4 June 2026, left a 16% national rainfall deficit by 27 July. At the district level, 53% recorded deficient/large-deficient rainfall, 34% were normal and only 12% saw excess rainfall.
- Regional & state extremes — By region: East & Northeast (−30%) and the Southern Peninsula (−29%) ran the deepest deficits, against Northwest (−10%) and Central India (−4%). Among states, Meghalaya's −56% was the sharpest deficit, while Ladakh's +196% was the largest surplus anywhere.
The Assam paradox
- Deficit state, flooded districts — Despite a 30% seasonal rainfall deficit statewide, Assam flooded across 12 districts, affecting over 700,000 people in 856 villages (as of 25 July) — heavy rainfall over Nagaland's hills drained rapidly into Assam's rivers, showing how short, intense spells can trigger disaster even in a 'dry' season.
What's driving the swings
- El Niño & western disturbances — Forecasters cited an 81% probability of a 'super' El Niño developing by October–December 2026 (El Niño years typically suppress South Asian monsoon rainfall), alongside unusually active western disturbances affecting the Himalayan region during the monsoon itself.
- Global warming's fingerprint — With the planet roughly 1.4°C warmer than pre-industrial levels, climate scientist Raghu Murtugudde noted that global warming tends to produce extreme spells in both active and break periods of the monsoon — explaining why deficit states can still see catastrophic, short-duration flooding.
2. Valsad's Historic Rainfall Record, Gujarat
What happened
- The record — Umergam, in Gujarat's Valsad district, recorded a 24-hour cumulative rainfall of 1,064 mm (106.4 cm) ending 0830 hrs IST on 23 July 2026 — India's third-highest daily rainfall ever recorded.
India's highest-ever 24-hour rainfall records| Rank | Place | Rainfall | Date |
|---|
| 1 | Cherrapunji / Sohra, Meghalaya | 1,563.3 mm | 16 June 1995 |
| 2 | Aminidivi, Lakshadweep | 1,168.5 mm | 6 May 2004 |
| 3 | Umergam (Valsad), Gujarat | 1,064 mm | 23 July 2026 |
The fallout
- Impact on the ground — More than 22,000 residents were evacuated and around 1,200 stranded people rescued as south Gujarat was battered; all rivers in Valsad, Navsari and Surat districts were in spate, flooding nearby villages and suspending rail traffic in the region.
3. Glacial Lakes of the Eastern Himalaya — the GLOF Watch
The Mago Chu Basin study
- What was studied — A satellite-based study by geospatial firm Suhora Technologies tracked 5 glacial lakes in the Mago Chu Basin, Tawang district, Arunachal Pradesh — all classified by the NDMA as 'high-risk' or 'very high-risk' — using ICEYE, PlanetScope and India's LISS-IV satellites over 2016–2026.
- The findings — Four of the five lakes expanded — Sanhapo Lake grew fastest, from 78.07 hectares (2019) to 88.81 hectares (mid-2026), making it the top-priority site for safety monitoring; Dharkha Tso and two other 'very high-risk' lakes grew more slowly, while only one lake stayed stable.
Why this matters — GLOF basics
- What is a GLOF — A Glacial Lake Outburst Flood (GLOF) occurs when a lake dammed by glacial ice or unstable moraine (debris) suddenly breaches, releasing a massive volume of water downstream with little warning — a growing hazard as Himalayan glaciers retreat and glacial lakes expand.
- The Sikkim precedent — The October 2023 South Lhonak Lake breach in Sikkim — which damaged the Chungthang hydropower dam and caused significant casualties — remains the cautionary precedent driving this monitoring; the NDMA's National GLOF Risk Mitigation Programme now covers 189 high-risk glacial lakes, while the Central Water Commission monitors over 900 glacial lakes nationwide.