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The down-by-night wind, carrying cold air into canyons and basins, often produces a temperature inversion, and higher elevations are warmer. The daytime wind will tend to produce cloudsindependent of traveling storms, for humid air, whenraised by convection, condenses into clouds—often thun-derheads—by early afternoon. Hence with a red sky inthe morning, that is, with some clouds present, mountaineers as well as sailors may take warning. Conversely, the evening reversal of wind and temperature disperses clouds, and thus if a storm has brokenenough to permit a red sunset, the continuing reversal(not the full moon) will clear it. |
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