The NWS has issued a wind advisory today for forecasted southerly winds around 30 mph. The featured chart displays directional frequency of reported 30+ mph wind speeds during April from the Des Moines Airport. Southerly winds are not the most favored for high winds, since warming is generally occuring which leads to upward motion near the surface acting to keep the strongest winds aloft from reaching the surface. The situation is reverse with northwest winds, since there is often cooling and decending motion which acts to bring stronger winds to the surface and keep them there.

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Tags:   april