After Saturday's snowfall blanketed the southern half of Minnesota with fresh powder, cold air has settled in, and it won't be going anywhere for a while. And get ready for what the National Weather Service is calling a "clipper wave train."

Temperatures will be stuck in the 20s Sunday through Wednesday, but then a bigger chill arrives with the passing of the first clipper. The weather service says low temperatures Thursday morning could be below zero, even in the Twin Cities, "with some [double-digit below-zero] lows" possible in central Minnesota.

"Depending on what happens with cloud cover, these still may not be cold enough," the NWS Twin Cities forecast discussion from Saturday afternoon said.

The first sub-zero low of the season averages Dec. 10 in Minneapolis-St. Paul, so this co

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