Hot Winds – Loo, Foehn, Chinook


These are Local Winds.

Loo, Foehn and Chinook are important hot winds of local category.

Loo

Loo are hot and dry winds, which blow very strongly over the northern plains of India and Pakistan in the months of May and June.

Their direction is from west to east and they are usually experienced in the afternoons.

Their temperature varies between 45°C to 50°C.

 

Foehn

Foehn is strong, dusty, dry and warm local wind which develops on the leeward side of the Alps mountain ranges.

Regional pressure gradient forces the air to ascend and cross the barrier.

Ascending air sometimes causes precipitation on the windward side of the mountains.

After crossing the mountain crest, the Foehn winds starts descending on the leeward side or northern slopes of the mountain as warm and dry wind.

The temperature of the wind varies from 15°C to 20°C which help in melting snow.

Thus making pasture land ready for animal grazing and help the grapes to ripe early.

 

Chinook

Chinook is the name of hot and dry local wind which moves down the eastern slopes of the Rockies in U.S.A. and Canada.

The literal meaning of chinook is ‘snow eater’ as they help in melting the snow earlier.

They keep the grasslands clear of snow.

Hence they are very helpful to ranchers.