The featured map presents the date so far this season that a given grid point had its coldest air temperature based on hourly NCEP RTMA data. For some parts of Iowa, this morning's temperatures are the coldest so far this season with values finally below zero for the first time for some locations. Locations plotted in the gray color would indicate this morning's temperatures being the coldest of the season. Other locations, particularly in western Iowa, are a bit warmer with southerly flow on the backside of the surface high pressure system helping to buoy temperatures. The featured map will be updated later this morning once the rest of this morning's data arrives.

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Tags:   rtma