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Bora (wind)
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The bora is a northerly to north-easterly katabatic wind in areas near the Adriatic Sea. Similar nomenclature is used for north-eastern winds in other littoral areas of eastern Mediterranean and Black Sea basins.
Hurricane-strength bora in Nin, Croatia
Hurricane-strength bora in Nin, Croatia
The bora on Molo Audace in Trieste, February 2011
The bora on Molo Audace in Trieste, February 2011
Bora seen from an aircraft near Novalja, Croatia (sea with white stripes)
Bora seen from an aircraft near Novalja, Croatia (sea with white stripes)
Senj during the 2012 European cold wave
Senj during the 2012 European cold wave
Katabatic wind
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A katabatic wind carries high-density air from a higher elevation down a slope under the force of gravity. Such winds are sometimes also called fall winds; the spelling catabatic winds is also used. Katabatic winds can rush down elevated slopes at hurricane speeds, but most are not that intense and many are 10 knots or less.
Plateau-cooled air falls into the Makhtesh Ramon, traced by radiation fog, just after dawn. Radiative cooling of the desert highlands chills the air,
Plateau-cooled air falls into the Makhtesh Ramon, traced by radiation fog, just after dawn. Radiative cooling of the desert highlands chills the air, making it more dense than the air over the lowlands. Cooler air can also hold less water vapour; it condenses out as tiny fog droplets, which re-evaporate as the air warms. Here, the falling air is warming adiabatically, and so the fog re-evaporates as it falls.
Katabatic wind in Antarctica
Katabatic wind in Antarctica