Periodic Variation of Rainfall in the Arid Region (Classic Reprint)
The greater portion of the precipitation over the Pacific and plateau regions undoubtedly is from the warm, moisture-laden prevalent west and southwest winds that have blown across the expanse of the Pacific Ocean, becoming cooled by being forced up to the high altitudes of the Cascade, Coast, Sierra Nevada, and Rocky mountains; some, however, is due to the inﬂuence of cyclonic disturbances passing across those regions. These warm, moist winds coming in contact with the mountains near the coast are forced to an elevation where their capacity to retain moisture is reduced by the lowering of their temperatures, and precipitation results; and the higher the altitude attained the lower the temperature experienced, the less is the capacity of the air to retain moisture. The moisture that still remains in the air after crossing the Cascade and Sierra Nevada ranges is, to a great degree, precipitated upon the higher elevations and summits of the Rocky Mountains. It must be believed, however, that even after crossing the Rockies some moisture still remains in the air.
Over the slope regions to the eastward of the Rocky Mountains the main source Of precipita tion is the warm, moisture-laden airs from the Gulf of Mexico, supplemented by moist winds from the Great Lakes, and the small amount remaining in the air that has crossed the Rockies; also, perhaps, some from the Atlantic Ocean.
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- 25 Jan 2017
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