This week is Severe Weather Awareness Week with Monday focusing on severe thunderstorms. The National Weather Service issues a Severe Thunderstorm Warning when it expects damaging winds over 58+ MPH and/or hail larger than one inch diameter. When the NWS issues their warning, it includes coded "tags" indicating their estimated wind speed and/or hail size. The featured chart looks at the frequency of these tags within the warnings. The most common thunderstorm warning (over one in three) is for 60 MPH winds and one inch hail. Thankfully the frequencies drop off considerable has you move to more intense thresholds. Iowa has yet to see a Severe Thunderstorm Warning yet this year. The peak for these warnings comes in late June.

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