Downslope winds.

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Presentation transcript:

Downslope winds

Shear Waves

Sierra Nevada Example

Air temp increased from -4 degrees F to +45 degrees F in 2 minutes from Chinook wind!

Banner Cloud Matterhorn

Mt Shasta Hiding UFO’s?

Mt Rainier: Cap cloud and lenticulars Lenticular Clouds over Mt. Erebus in Antarctica

Re-circulating air on lee side of mountain Rotor Cloud Re-circulating air on lee side of mountain

Arikaree Glacier, Colorado Annual snow accumulation about 15 meters because of rotor effect

Wavelength directly proportional to wind speed Inversely proportional to stability Intermountain West - averages 4 miles Appalachia Wave - averages 10 miles

Conditions Diurnal variation: in the summer early morning or late afternoon is best for formation Seasonal variation: winter is the best time for formation (jet stream, snow covered ground = no convection, stable layer aloft)