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An Arctic air surge is causing temperatures in Michigan to drop below zero.

The extreme cold is a result of a weakened polar vortex allowing frigid air into the U.S.

A gradual warm-up will begin Friday, but light snow chances will continue through the weekend.

Temperatures across Michigan are forecast to plunge to the some of the coldest in the U.S. this week, dipping well below zero in places as a surge of Arctic air s weeps in.

The broader weather pattern will stay active and winter-like through the end of the week and into the weekend . A recent stratospheric disturbance weakened the polar vortex, allowing frigid Arctic air to spill into the U.S. and shift the jet stream, bringing snow and wintry precipitation to several regions.

While the heaviest snow w

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