With strong to likely severe thunderstorms forecast over Iowa Friday, it is a good time to check in on the frequency of thunder being reported at the Des Moines airport weather station. Based on available hourly or better reports, the featured chart presents the monthly number of distinct hours with at least one thunder observation. The blue bars are the simple long term average and red bars are the year to date. The annual cycle is obvious with non zero values still found during the cold season. March is just the start of thunderstorm season with about triple the amount of hours, on average, found during April.

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Tags:   thunder