DULUTH (AP) - Plunging temperatures in Minnesota are making snow removal a bit tricky as fluffy precipitation turns to rock hard ice.

City crews in Duluth scrambled to clear streets before the deep freeze Thursday. Schools are canceling classes again in Duluth, Superior, Wis., and other cities in the region.

Forecasters expect the daytime temperature Thursday will reach 13, but just 4 below on Saturday.

A National Weather Service observer recorded 42 inches of snow just north of Two Harbors. Spotter Alice Findley uses a neon pink yardstick to measure the snow for the weather service. Findley lives on a big hill where the lake effect usually delivers a bit more snow. Findley says she took several measurements around her yard and the snow was deeper than her yardstick in all locations.

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