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Show Know The Weathe l Howdothe"expen, It? their long-range weath. casts? " jj t'.i WEATHER forecast, anumberofthingsinjt.; H ing what the weather,1 P the U.S., in a paniculi-, period. One of the things the. closest is the build:! movement of large v masses in the polar rn These air masses spill 0 flow down over Can-? enter the United Stai" often bring cold and weather. THEIR COLRSEca.-be COLRSEca.-be predicted. If fewer c' polar air masses are in or if they seem weak,t likely that warm air will push upward ando!' U.S. -or at least overs', erly part of it. ' Taking these calc under consideration, al,-factors al,-factors something mor; "guess" can be arrj-J although the "expem miss--the weather rf! something of a myster, |