In stark contrast to last week's sunny weather, more than 100 million Americans will see temperatures drop below freezing this weekend.
At least 20 states are under a frost or freeze watch, warning or advisory on Saturday morning. Although most of those states are in the Midwest or Northeast, the advisories stretch all the way down to Georgia and South Carolina.In some Northeast states, it will feel more like early March than May. A system that began in the Great Lakes region will bring gusty winds and 6 to 12 inches of wet snow to New England.
Blame the polar vortexThe polar vortex was so strong this winter and spring that it led to the largest-ever Arctic ozone hole, but not a lot of cold weather.How to protect your garden from May's surprise cold snapThe polar vortex, as its scary name suggests, is a circulation of strong, upper-level winds that normally surround the northern pole, moving in a west to east direction -- a polar low-pressure system.
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