Mr. lee's expository writing class (kayak1)

Race #41061

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Official speed 84.21 wpm (57.43 seconds elapsed during race)
Race Start February 6, 2017 5:13:57pm UTC
Race Finish February 6, 2017 5:14:54pm UTC
Outcome No win (2 of 2)
Opponents 1. stillow2 (96.08 wpm)
Accuracy 90.0%
Points 0.00
Text #3622192 (Length: 403 characters)

Valley (or graben) breezes and mountain breezes are a very localized phenomenon. They relate directly to daily temperature variations between summits and bases. Since it is in the highest reaches that the maximum diurnal range is attained, it is the summits which drive the mechanism. Nights in the mountains are colder than those in the valleys below, especially if moist air collects in those valleys.