The coolest air of the season to date settled into Iowa overnight with some limited areas of the state likely to have experienced their first freeze. The featured map presents a minimum temperature analysis of the 15 minute interval NWS/NCEP RTMA temperature product. Note that this product is not a true minimum value, but we assume that the 15 minute interval resolution was close enough to capture the minimum. The color ramp and legend intends to highlight temperatures near freezing. The coldest temperatures found within this analysis are over the valley regions of western Iowa, but widespread freezing temperatures appear to not have happened with this event.

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