Rainfall patterns are often quite complex during the summer season as thunderstorms are more isolated and move slowly, which both lead to very fine scale gradients. The featured map is an illustration of this by showing the number of days one has to go backwards in time before accumulating at least a half inch of precipitation. The blue areas of the state generally saw rainfall back two weekends ago. The rest of the state one has to go further back in time. While the threshold nature of this plot will lead to some arbitrary gradients, there are still some very impressive localized differences such as Humboldt county ranging from 0-10 to 30-40 days and much of southeastern Iowa. Forecast rainfall totals for this coming weekend have crept upwards a bit for southeastern Iowa, so hopefully that will pan out!

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