. Elementary physical geography;. same courses that are taken bythe latter—westerly in tropical and easterly in temperatelatitudes. In many cases a storm may originate at sea and end somewhere ata considerable distance inland, or vice versa. Many West Indian hurri-canes sweep intothe Gulf of Mexicoand thence into theMississippi the other hand,many north Atlan-tic storms begin farin the interior of thecontinent. In someinstances stormsoriginate in the Pa-cific, cross the Uni-ted States and theAtlantic, and finallydisappear in the in-terior of of the cy-clonic storms ofCal
. Elementary physical geography;. same courses that are taken bythe latter—westerly in tropical and easterly in temperatelatitudes. In many cases a storm may originate at sea and end somewhere ata considerable distance inland, or vice versa. Many West Indian hurri-canes sweep intothe Gulf of Mexicoand thence into theMississippi the other hand,many north Atlan-tic storms begin farin the interior of thecontinent. In someinstances stormsoriginate in the Pa-cific, cross the Uni-ted States and theAtlantic, and finallydisappear in the in-terior of of the cy-clonic storms ofCalifornia and Ore-gon travel south-ward between theCoast Ranges andthe Sierra NevadaMountains. Per-haps they are dissipated in the arid region to the southward, but occa-sionally a cyclonic storm finds enough moisture to enable it to passinto the Mississippi Valley. Storm Tracks of United States.—Since the establish-ment of the various weather bureaus, the storm trackshave been closely studied, and it is found that most storms. A STORM, OR AREA OF LOW BAROMETER The shaded part is the area of rain; the dotted region the aioj cloudiness. The arrows fly with the wind. 256 PHYSICAL GEOGRAPHY follow certain lines. In the United States two such tracksare apparent. The lesser number follow the trend of theAtlantic coast. These storms usually overlap the coastplain, but they seldom extend west of the Appalachianhighlands. They belong to the class of West Indian cy-clones, originating in the Caribbean Sea, and turningnorthward, along the Middle Atlantic coast. Most of the storms form near the great highlands of thewest—very frequently near the eastern base of the RockyMountains, crossing the continent in a northeasterly direc-tion. These storm tracks have a distinct tendency to shiftnorth or south with the apparent motion of the sun, thebelt being a little farther north in summer than in valley of the St. Lawrence River and the basin of theGreat Lakes is a common track fo
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