When rapid temperature drop causes wet roads and surface to freeze straight to ice.
3 Mentions
Heavy snow is developing across northwest Wisconsin. Looks like 2-6" of additional snow accumulation, lesser amounts in the northeast. To the south, light freezing rain was reported in northeast Iowa earlier. This precipitation is moving into southern Wisconsin now. Up to 0.10" of ice accumulation is possible this afternoon. And for the icing on the cake, a 50F temperature swing from northwest to southeast Wisconsin! flash freeze seems likely. Precipitation will end tonight.
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