A sustained wind of roughly 62 to 88 km/h — Beaufort Force 8 to 9 — strong enough to strip roofs, bring down trees and keep fishing fleets in harbour.
BasicsWhat is a gale?
A gale is a strong, sustained wind — not a single violent burst, but a wind that holds near its peak for an extended period. On the Beaufort scale, Force 8 is a gale and Force 9 a strong gale, covering sustained speeds from about 62 km/h to about 88 km/h.
The distinction between sustained wind and gust matters enormously. A thunderstorm can throw out a 90 km/h gust that lasts ten seconds and is gone; a gale keeps pushing for hours. That sustained loading is what works a roofing sheet loose, snaps a tree that survived the first shock, builds a heavy sea and steadily drives water against a coastline. For fishermen on the Konkan coast, ferry operators on the Meghna and anyone living under a tin roof, a gale warning is a very different instruction from a thunderstorm warning.
The Beaufort scale and where a gale sits
The Beaufort scale was devised by a Royal Navy officer in the early nineteenth century as a way of estimating wind from its visible effects on sea and land, and it still works for that. The gale range and its neighbours:
- Force 7, near gale — about 50 to 61 km/h. Whole trees in motion; walking into the wind becomes awkward.
- Force 8, gale — about 62 to 74 km/h. Twigs break off trees; progress on foot is genuinely difficult.
- Force 9, strong gale — about 75 to 88 km/h. Slight structural damage begins; roofing sheets and chimney cowls lift.
- Force 10, storm — about 89 to 102 km/h. Trees uprooted, considerable structural damage.
- Force 12, hurricane force — from about 118 km/h upward. This is the threshold at which a tropical cyclone becomes a Very Severe Cyclonic Storm on the IMD scale.
Because the scale is tied to observable effects, it is a useful cross-check on an instrument reading. If the forecast says 70 km/h and you cannot see whole trees bending, the wind at your street is not doing 70 km/h — urban shelter cuts ground-level wind dramatically compared with the open, 10-metre exposure a weather station uses.
Gales in South Asia
The monsoon surge over the Arabian Sea. The southwest monsoon is carried by a powerful low-level flow that crosses the Arabian Sea and strikes the west coast of India. When that flow strengthens into a surge, the Kerala, Karnataka, Goa and Konkan coasts see gale-force westerlies with heavy rain and a dangerous sea state. This is why fishing bans and small-craft advisories cluster around monsoon onset and around active spells rather than around named storms.
Bay of Bengal systems. Depressions that form in the Bay during the monsoon and, more dangerously, during the pre-monsoon and post-monsoon cyclone seasons bring gales to the Odisha, West Bengal, Andhra Pradesh and Bangladesh coasts well before any cyclone centre arrives. The outer wind field of a large system is far wider than its damaging core, so gale conditions often start a full day ahead of landfall. The 1999 Odisha Super Cyclone and Cyclone Amphan in 2020 are the reference points for what the Bay is capable of at the extreme end.
Pre-monsoon squalls. In March to May, the nor’westers of West Bengal, Bangladesh, Bihar, Jharkhand and Odisha produce short-lived winds that reach gale force or beyond. These are squalls rather than true gales — intense but brief — yet the damage profile is similar because the wind arrives with no warning.
Northwest India and Pakistan. Strong Western Disturbances in winter and spring bring gusty gale conditions to Balochistan, Khyber Pakhtunkhwa and the hills of Kashmir and Himachal, often with dust ahead of the rain.
What a gale does: damage, sea state and warnings
The force a wind exerts rises with the square of its speed. A 70 km/h gale pushes roughly four times as hard as a 35 km/h breeze, not twice as hard. That non-linearity explains why conditions seem tolerable and then, over a fairly narrow band of increasing wind, stop being tolerable at all.
The typical South Asian damage list from a sustained gale:
- Roofs — loose tin sheets, asbestos and tiles, and any tarpaulin, are lifted first. A sheet in flight is the single most dangerous object in a gale.
- Hoardings and signage — large flat surfaces catch the full load; billboards and shop boards fail at the fixings.
- Trees and power lines — soil already saturated by monsoon rain holds roots poorly, so trees that stand through a dry-season gale come down in a wet-season one, taking distribution lines with them.
- Sea and river traffic — boats, ferries and launches are at risk long before the wind threatens buildings, and a sea whipped up over hours stays dangerous after the wind eases.
- Standing crops — paddy and wheat near harvest flatten, and mango and banana are stripped.
Warnings come from the national agencies. The IMD issues warnings to fishermen and coastal alerts describing squally or gale-force winds with a speed range and a validity window, and the Pakistan Meteorological Department issues the equivalent for the Sindh and Balochistan coasts. The Bangladesh Meteorological Department uses a numbered cyclone signal system at its maritime ports, and those numbers, not the wind figure, are what coastal Bangladesh acts on.
Staying safe when a gale warning is issued
Secure or remove anything with a flat face: tarpaulins, loose sheets, unbolted water tanks, scaffolding netting and pots on balconies. Park away from large trees and hoardings, and avoid two-wheelers in a crosswind gale — the sideways push near gaps between buildings is substantial and unpredictable. Assume power will fail and charge phones and lights first.
Keep away from downed cables and from the seafront: watching a rough sea from a promenade has killed people in every storm season. If you work at sea or on a river, the warning is the decision, not the sky, which frequently looks survivable right up until it is not.
Frequently asked questions
How fast is a gale in km/h? A gale is Force 8 on the Beaufort scale, about 62 to 74 km/h sustained. A strong gale is Force 9, about 75 to 88 km/h. Above that the scale moves on to storm force and ultimately hurricane force at around 118 km/h.
What is the difference between a gale and a gust? A gale is a sustained wind held over a long period; a gust is a brief peak lasting a few seconds. A forecast can carry gusts well above gale force without the sustained wind ever reaching Force 8 — which is typical of thunderstorms.
Is a gale the same as a cyclone? No. A gale describes a wind speed, whatever produced it. A tropical cyclone is an organised storm system that can produce winds far stronger than gale force at its core, but also spreads gale-force winds across a much wider area around it.
Do gales happen away from the coast? They are much less common inland, because friction with buildings, trees and terrain slows the wind. Inland South Asia more often gets brief squall-force gusts from thunderstorms and dust storms rather than sustained gales.
Where can I check wind warnings for my city? Every Mausam Online city page shows wind speed and gust forecasts hour by hour. Coastal and delta cities worth watching in storm season include Karachi, Mumbai, Visakhapatnam, Puri, Chittagong and Kolkata.