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The storm consists of a humid mass of air of lowbarometric pressure, that travels from west to east, overrides the cooler mass of air in front of it, cools to produce clouds, and cools still more to precipitate them.Wind blows spirally inward and counterclockwise aboutits center. As the storm approaches, the temperature rises,the barometer falls, the wind backs (e.g., from west tosouth), cirrus clouds (mare's-tails) and alto-cumulus(mackerel sky) appear in the vanguard, storm warnings in the form of cloudcaps fly from the peaks, progressively lower clouds follow, the wind and the temperature increase further, the barometer continues to fall, and precipitation begins. |
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