A reinforcing shot of cold air is set to arrive this weekend and some weather models are predicting very cold temperatures on Sunday morning. The featured map is from the NAM hi-res conus nest model showing forecasted near surface air temperatures on Sunday morning at 7 AM. The resolution of this model is sufficient to attempt to resolve subtle topographic effects on temperature in Iowa. You will also notice the heat island of Des Moines visible as well. The warmer areas in eastern Iowa are probably under some clouds, which help to support the temperature at night time.

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