When the National Weather Service issues Severe Thunderstorm Warnings, they include "tags" that indicate the estimated and/or observed threat associated with the warning. The featured chart presents the frequency of a given wind gust and hail size combination for all Severe Thunderstorm Warnings issued for Iowa this year. Since these tags can change with the life cycle of a warning event, this chart provides the maximum value of each per each warning. The right hand and lower sides of the chart show the per magnitude totals. The chart shows that the vast majority of warnings are at the minimum severe thresholds of wind gust (~60 MPH) and hail size (one inch diameter). Only about 2% of all warnings reach thresholds of 80+ MPH and/or two inch diameter hail. You can generate this chart for other states and time periods of your choice!

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