The featured chart displays two daily frequencies of tornado and severe thunderstorm warnings in the United States. The green bars are the percentage of years since 2002 that at least one tornado or severe thunderstorm warning occurred on. The blue bars are the simple average number of total warnings issued per day. So while the number of warnings peaks in mid June, just about every day during the summer season sees severe weather somewhere in the US. In fact, this chart shows there has not been a day in July without severe weather since 2002. More severe weather is possible today in Iowa along with continued heavy rainfall events.

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Tags:   nws   severe