A Dense Fog Advisory is in effect for the entire state this Friday morning. The featured chart presents some frequency metrics for how often this weather alert is issued for somewhere in the state of Iowa. The top panel shows the weekly frequency of having at least one event for that week per year. The bottom panel shows the overall total number of events. The winter months are certainly the most common time of year for this product with summer having the least. Fog is easier to maintain during the winter thanks to moist air masses over top a colder ground surface which helps to keep air temperatures near water vapor saturation.

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Tags:   fog