Humidity levels have been on the increase with the approach of the storm system that will make its way through Iowa today. As you'd expect, these increased humidity levels have been thanks to transport from our south. The featured chart displays the average dew point by a given wind direction for November for Des Moines. There is a large difference in humidity levels when the wind direction switches from south to northwest. The source region of air masses from those directions easily explains the difference. With southerly air masses influenced by the humid Gulf of Mexico and the northwesterly air masses coming from the arid high plains.

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