Originally posted by mangerton
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Anna is situated in a very good location for this type of airstream, one in which areas to the lee of elevated ground receive descending air which has dried out, and heats up at a faster rate than that at which it had cooled on the ascending side of the elevated ground - if that makes any sense! It's known as the Fohn effect, with an umlaut over the "o", and is responsible for rapid thaws in some mountainous areas, notably north of the Alps and east of the Rockies.
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