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December 2000 Storm: Temperature -
This animation shows the sea level pressure isobars (black lines) and surface air temperatures (colors) as a continental polar airmass moved southward and eastward from Canada into the central United States. The leading edge of this airmass was a cold front (sharp blue/green boundary in the animation) that trailed southwestward from a strong low-pressure center. The low center was moving northeastward from the Mississippi Valley to New England. The cold airmass moved southeastward behind the cold front, eventually overspreading all but the southern and western fringes of the United States. Notice how the temperatures in the core of the airmass moderate as the cold high pressure center moved across the United States.
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