CASPER, Wyoming. – The number of severe thunderstorm warnings that have been issued in western and central Wyoming is approximately 64.4% lower than average.
The Riverton National Weather Service said Thursday it issued 21 severe thunderstorm warnings in 2021. The average number of severe thunderstorm warnings issued for western and central Wyoming per year is 59.
This average is based on data from 2002 to 2021, according to the Riverton NWS.
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In southeastern Wyoming and the Nebraska Panhandle, the number of severe thunderstorm warnings issued by the NWS at Cheyenne in 2021 is down about 15.4% from the average.
The Riverton NWS shared data from Iowa State University on the number of severe thunderstorm warnings issued across the country in 2021.
This graph shows the total number of severe thunderstorm warnings issued until Thursday in 2021:
The following graph shows the deviation from the average for National Weather Service offices across the country: