Fog was common yesterday over Iowa and continues this morning as a major winter storm organizes. The featured chart presents the frequency of having the maximum afternoon temperature above the average daily high temperature when fog was reported at the 6 AM observation that day for Des Moines. The general signal is for fog in the winter time to be associated with warmer than average afternoon temperatures. Correlation is not causation and foggy conditions in the winter time are typically a sign of being on the warm side of a passing storm system. The cold side of the storm system will arrive today and take the fog with it. So enjoy the fog and slightly warmer temperatures while they last!

Voting:
Good = 19
Bad = 8
Abstain = 3

Tags:   fog