Why does the Western US get less rain than the Eastern US?

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  • TQ
    Lv 7
    6 months ago
    Favorite Answer

    Here are the real reasons why the Western [sic] US [sic] States gets less rain than the Eastern [sic] US [sic].

    These reasons are related directly to the semi-permanent areas of HIGH pressure located offshore of both east and west coast and the jet stream responsible for their creation.

    On the west coast .. the clockwise circulation are the HIGH transports cool dry moist air polar/arctic air into the mid-latitudes. The southerly motion toward lower latitudes decreases deep vertical layer rotation (vorticity through the conservation of angular momentum) producing downward vertical motion.

    Downward vertical motions leads to evaporation ... dissipation of clouds ... and no precipitation.

    The final reason is related to the Westerlies (sometimes referred to incorrectly as the jet stream). The Westerlies decelerate as they move off over the open water and onto land which favors the development a long wave ridge of HIGH pressure where downward vertical motions are also present.

    The exact opposite mechanics are observed on the east coasts of Northern Hemisphere land masses.

    On the east coast .. the clockwise circulation are the HIGH transports warm moist tropical air into the mid-latitudes. The northerly motion away from lower latitudes increases deep vertical layer rotation (vorticity through the conservation of angular momentum) producing upward vertical motion.

    Upward vertical motions leads to condensation ... clouds ... and precipitation.

    The final reason is related to the Westerlies (sometimes referred to incorrectly as the jet stream). The Westerlies accelerate as they move off land and out over open water which favors the development of a long wave trough of LOW pressure where upward vertical motions are also present.

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    • TQ
      Lv 7
      6 months agoReport

      The LOL TD troll clown car rides again!

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