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Bora
A cold, katabatic NE wind that crashes off the Dinaric Alps onto the eastern Adriatic — sudden, dry, and one of the most violent winds in the Mediterranean.
Also known as: bura
The Bora is the most famous katabatic wind in the Mediterranean. Cold continental air pools over the Dinaric Alps, finds a saddle or a gap, and crashes down to the coast at 30–60 kt — gusting well over 80 on the strongest days. It can arrive in minutes, blow for three days, and leave the same way.
Where it rules:
- Senj and the Kvarner gulf, Croatia — the textbook Bora corridor
- Trieste, Italy — northern end, famous for harbour rope warnings
- Velebit channel — extreme funnelling
- Vinodol, Pag, Rab — most reliable kiteboarding spots in a Bora regime
What makes it brutal for riders:
- Offshore — cold continental air blowing seaward
- Very gusty — gust factors of 1.4–1.7 are normal, much higher near terrain
- Cold — winter Bora arrives 10–20 °C below sea temperature
- Underforecast by global models that smooth the Dinaric ridge — regional models like ICON and AROME resolve it far better
Two cousins to watch: the Tramontana on the western Adriatic and the Vardarac in northern Greece work the same way. Wider context in Types of Wind.
Related terms
- 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.
- Gradient wind The large-scale wind driven by pressure differences between weather systems — the synoptic background flow that everything else rides on top of.