Here is a seasonal wind diagram that Nav Canada did up for YYC, you can see the direction of the wind and the frequency with which it usually occurs in the summer/winter:
Quote:
Originally Posted by J epworth kendal
How often are the Chinook winds higher than 20 knots? Would this be a big problem, say if a big Chinook corresponded to a very busy period like Christmastime?
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It will definitely affect them, as our ATC'er pointed out it will reduce capacity anywhere from 30-50 percent. So procedures like flow control and ground holds at the departure airfield for flights to YYC (things that are already happening here currently) will be in place in that situation.