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Mistral
A cold, strong NW wind that funnels down the Rhône valley to the Gulf of Lion — France's most famous riding wind.
Also known as: le mistral
The Mistral is the textbook gap wind: a cold synoptic NW flow squeezed between the Alps and the Massif Central, accelerated through the Rhône valley, and dumped onto the Mediterranean coast at 30–50 kt. It can blow for one day or for ten.
For French Med riders the Mistral is the main event. Spots like Hyères, Almanarre, La Couronne, and the wider Gulf of Lion live on its schedule.
What to expect:
- Direction — N to NW, depending on where on the coast you are
- Strength — 25–45 kt typical, 50+ kt on the strongest days, gusts higher
- Gust factor — moderate (1.2–1.3) over open water, higher in the lee of inland terrain
- Duration — 3-day cycles are typical, but a strong Mistral can run 5–7 days
- Best forecast — AROME (Météo-France) resolves the channelling better than GFS
A 20 kt synoptic westerly upstream can become a 40 kt Mistral by the time it reaches the sea. If you ride the French Med, you check the Mistral pattern first, the synoptic chart second.
Related terms
- Gradient wind The large-scale wind driven by pressure differences between weather systems — the synoptic background flow that everything else rides on top of.
- Katabatic wind A gravity-driven wind formed when cold, dense air drains downhill off a high plateau or glacier — often offshore, often ferocious.
- Föhn wind A warm, dry, often gusty downslope wind on the lee side of a mountain range — Föhn in the Alps, Chinook in the Rockies, Halny in the Tatras.