A Blizzard Warning is in effect for today into tomorrow for much of north central Iowa. Such warnings are issued when strong winds are combined with falling or blowing snow to reduce visibilities for at least three hours. The featured map displays the frequency of blizzard warnings per year by county since 2007 based on IEM unofficial data. If you know the land form regions of Iowa, the map nicely aligns as frequencies are the highest over the flattest and least tree covered areas of the Des Moines Lobe. Having terrain features and trees makes achieving blizzard conditions more difficult as near surface wind speeds are reduced and obstructions cut down on blowing snow. After the Blizzard rolls through, much colder air is set to arrive for the weekend along with bitter cold wind chills.

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Tags:   blizzard