Temperatures soared last Thursday (30 Dec) pushing 60 degrees for Des Moines. Not all Iowans were as lucky with those in north-eastern Iowa only in the mid 40s. The primary reason was the deep snow pack that existed prior to the strong push of warm air into the state. The featured chart presents an analysis of high temperature versus the snow depth present that morning. The relationship is clear! A common forecasting rule says the high can only reach 43 with 4+ inches of snow on the ground, the push of warm air was exceptionally strong which is why this rule didn't quite hold.

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Tags:   snowcover