The featured map displays an analysis of minimum hourly NCEP high resolution temperatures since last Thursday. A significant portion of the upper Midwestern US experienced its first sub freezing temperature of this fall season. This analysis has only a small sliver of far southeastern Iowa not breaching 32 degrees. Maps like this one also routinely show the moderating effects of the Great Lakes. Locations near the lakes and downwind will benefit with warmer near surface air temperatures this time of year.

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