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Weather and Rock - part 3
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4) The slower the transition between stages, the
longer the storm will last.
Exceptions to any prescribed rules of storm behavior probably, in total, outnumber the rules. Some of the exceptions: 1) The barometer will record a daily variation, low est near noon, having nothing to do with storms. Read ings will decrease with altitude far more than with storm: Pressure (inches) 30 27 24 21 18 15 12 Elevation (feet) 0 2,871 6,080 9,718 13,918 18,886 24,966 2) Mountains usually distort the wind; a moun taineer's camp may be so sheltered by a ridge that an ominous shift in the wind's direction goes undetected. The direction of local air currents may be opposite to that of the prevailing wind. High clouds are the best weather vane. 3) Slope and daily temperature change affect wind, which tends to blow up the slope by day, down by night. 4) The down-by-night wind, carrying cold air into canyons and basins, often produces a temperature inversion, and higher elevations are warmer. 5) The daytime wind will tend to produce clouds independent of traveling storms, for humid air, when raised by convection, condenses into clouds—often thunderheads—by early afternoon. Hence with a red sky in the morning, that is, with some clouds present, moun taineers as well as sailors may take warning. 6) Conversely, the evening reversal of wind and tem perature disperses clouds, and thus if a storm has broken enough to permit a red sunset, the continuing reversal (not the full moon) will clear it. Loose and jailing rock.—Just as avalanches are the most common mountain danger for the skier, falling rock is most common for the rock-climber. Weather is a frequent cause of rock fall; rocks are brought down by changes of temperature and resultant splitting action of intermittent freezing and thawing, as well as by heavy rain. Rock falls occur on all steep slopes, particularly in gullies and chutes. Areas of frequent rock falls may be indicated by abundant fresh scars on the rock walls, fine dust on the talus piles, or lines, grooves, and rock-strewn areas on snow beneath cliffs. A more immediate cause of rock fall is carelessness in climbing by both man and beast.
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