A blast of the season's first frigid air was bearing down on much of the U.S. on Monday, bringing the prospect of snow to parts of the country, and plunging temperatures in Florida — though it is unclear whether it will get cold enough for iguanas to tumble from the treetops.

National Weather Service forecasters said frigid Arctic air will pour into the eastern two-thirds of the country, bringing with it the chance for record low temperatures in the U.S. Southeast, including all of Florida, where temperatures in parts of the state were near 80 degrees Fahrenheit (27 degrees Celsius) just a day ago.

The cold air will reach the Great Plains on Monday, bringing gusty wind and red flag warnings in the region, according to forecasters, and the Great Lakes and Appalachian Mountain regions woul

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