Tornadoes & Severe Storms

Severe Weather Threat Climatology

Tornado Days (1990-2009) learn more

Tornado Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of tornado days per year (all magnitudes) within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
F1+ Tornado Days (1990-2009) learn more

F1+ Tornado Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of F1+ tornado days per year within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
F2+ Tornado Days (1990-2009) learn more

F2+ Tornado Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of F2+ tornado days per year within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
F4+ Tornado Days Per Century learn more

F4+ Tornado Days Per Century

Using data from 1990-2009, Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of F4+ tornado days per century within 25 miles of any point. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
1.25-Inch Hail Days (1990-2009) learn more

1.25-Inch Hail Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of 1.25-inch hail days per year within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
50-Knot Wind Days (1990-2009) learn more

50-Knot Wind Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of 50-knot wind days per year within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
65-Knot Wind Days (1990-2009) learn more

65-Knot Wind Days (1990-2009)

Harold Brooks and the National Severe Storms Laboratory (NSSL) have created a contoured U.S. map of the average number of 65-knot wind days per year within 25 miles of any point from 1990-2009. Data has been provided, in part, by Tom Grazulis of the Tornado Project and NWS records.
Total number of tornadoes by county learn more

Total number of tornadoes by county

This map displays the total number of tornadoes observed in each county.

Other Tornado & Severe Storm Products