Tornadoes - August 2019
This analysis is based on preliminary data available from the Storm Prediction Center. Final tornado counts published by the Storm Prediction Center and NCEI's Storm Events Database might differ from this report. For a more detailed climatology, please visit our tornado climatology page.
According to data from NOAA's Storm Prediction Center, during August, there were 75 preliminary tornado reports. This is less than the 1991-2010 average of 83 tornadoes for the month of August. The most active day of the month was August 11, in which 13 tornadoes were reported. Most of these were clustered across northeastern Colorado with a few other isolated tornadoes in Montana, Wyoming, Nebraska and Kansas. This was also the only day during the month that 10 or more tornadoes were reported.
Approximately one-third of the tornadoes during August occurred during a 3-day period from August 11-13, with 26 tornadoes reported. This was the busiest period of tornado activity for the month with most of the tornadoes occurring across the Rockies, Upper Mississippi Valley and Northern Plains states, and there were no reported deaths. During the relatively quiet month, one other notable day of tornadoes was August 17 that produced eight tornadoes across Minnesota and Iowa, with no reported deaths.
Did You Know?
Final monthly tornado counts are typically less than the preliminary count. This can be due to some phenomena being inaccurately reported as tornadic activity or a single tornado being reported multiple times. Tornado accounts are reported to the local National Weather Service forecast offices who are responsible for going into the field and verifying each tornado reported. This process often takes several months to complete. Once all reports have been investigated, the final count is published by the Storm Prediction Center.
The monthly climate reports are written using the preliminary numbers because the final data is not available at the time of production. Historically, for every 100 preliminary tornado reports, at least 65 tornadoes are confirmed. An error bar is depicted on the tornado count graphic representing this uncertainty in the preliminary tornado count.