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Tornado Count

The final monthly tornado count is typically less than the preliminary count due to some reported tornadoes not actually being a tornado or a single tornado being reported multiple times. Given in this report is the monthly preliminary tornado count because the final tornado count was not available at the time of production. Reports of tornadoes come into the National Weather Service by trained spotters, local officials, emergency responders, media, and the general public. Frequently, a reported tornado can actually be a cloud feature that resembles the shape of a tornado, but is not actually a tornado. Historically, for every 100 preliminary tornado reports, at least 65 tornadoes are typically confirmed. The red error bar shown for the tornado count represents this uncertainty in the preliminary tornado count. The local National Weather Service forecast offices are responsible for going into the field and verifying each tornado reported and the final count is archived by the Storm Prediction Center (SPC). The final tornado count is published by the SPC once all reports have been investigated, which usually takes several months.