A blast of the season’s first frigid air was bearing down on much of the u.s., bringing the prospect of snow to parts of the country and plunging temperatures in florida — though it may not get cold enough there for iguanas to tumble from the treetops. The cold air broke off from the polar vortex above canada, sending. A blast of arctic air is set to sweep across the eastern half of the us starting tomorrow, sending temperatures 15 to 25 degrees below the historical average Expect frosty mornings, biting winds, and the season's first snow. Video via nasa goddard scientific visualization studio. Arctic blast takes aim bringing bitter cold temperatures and mountain snow to east tennessee a quick moving cold front moves in today bringing a shot of snow for some bitter cold for all of east tennessee
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