Question 3: Let\'s examine Western Canada\'s Chinook winds. Winds carrying a Tm

Question

Question 3: Let's examine Western Canada's Chinook winds. Winds carrying a Tm airmass at 20°C and 100% RH. from over the pacific are forced upwards by the coastal and rocky mountains (height 3000 m) upon hitting the British Columbia coast. Using the values found in the lectures for the SALR, ADLR, ELR and the saturated vapor curve (Figure 4.5 in the textbook) determine: (a) The temperature of the air as it crests the mountains (b) How much snow falls on the mountains (in grams of snow per cubic meter of air) (c) The temperature and relative humidity of the air that arrives in Calgary (elevation 1000 (d) Why might the aboriginals who lived in this area have named the wind "Chinook?" (translates to English as "Snow Eater")

Explanation / Answer

d) Chinook winds are formed as a result of adiabatic warming of air which moves downwards. It is found at the junctions where the mountains of North America are traversed by the Canadian Prairies and the Great Plains. Since the warm winds from the ocean advance into the interiors of the West of North America, the snow is melted. Thus, these winds are referred to as "Snow Eaters" or "Chinook"

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