Tornadoes - September 2017

NCEI added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.

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 September, there were 32 preliminary tornado reports. This is below the 1991-2010 average of 74 for the month. More than half of the tornadoes reported during the month were in the Southeast and associated with the landfall of Hurricane Irma in Florida. There were no tornado-related fatalities reported during September. However, due to the nature of Hurricane Irma, it is difficult to determine any significant difference in the number of fatalities from a specific tornado versus the 90 fatalities that were reported on the mainland due to the impacts of the storm.

For January-September, there were 1,365 preliminary tornado reports, with 1,231 preliminary tornado reports awaiting confirmation for February-September. This was the largest number of tornadoes during the January-September period since 2011 when there were over 1,500 tornadoes. The 1991-2010 January-September average number of tornadoes is 1,109.

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Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: Tornadoes for September 2017, published online October 2017, retrieved on October 21, 2017 from