Riskiest Counties for Tornado

Ranked by FEMA National Risk Index tornado hazard score · code TRND

Tornado risk reflects violently rotating columns of air capable of catastrophic local damage. FEMA's National Risk Index scores each county's tornado hazard from its expected annual loss, annualized event frequency, and exposed population. Cook County, Illinois currently leads the nation with a tornado score of 100.0 and $345M in expected annual loss. Texas, Michigan, Illinois account for much of the highest-rated tornado risk in this dataset.

Read the full tornado risk guide — how FEMA scores it and how to prepare →

County Rankings

#CountyStateTornado ScoreRatingAnn. Freq.Ann. Loss
1Cook CountyIL
100.0
Very High 1.04 / yr$345M
2Harris CountyTX
100.0
Very High 1.61 / yr$407M
3Bexar CountyTX
99.9
Very High 0.43 / yr$124M
4Tarrant CountyTX
99.9
Very High 0.89 / yr$144M
5Collin CountyTX
99.9
Very High 0.86 / yr$420M
6Dallas CountyTX
99.8
Very High 0.93 / yr$115M
7Shelby CountyTN
99.8
Very High 0.51 / yr$70M
8Denton CountyTX
99.8
Very High 0.95 / yr$145M
9Hillsborough CountyFL
99.7
Very High 1.31 / yr$77M
10Jefferson CountyKY
99.7
Very High 0.28 / yr$80M
11Travis CountyTX
99.7
Very High 0.54 / yr$96M
12Oakland CountyMI
99.7
Very High 0.39 / yr$102M
13Hennepin CountyMN
99.6
Very High 0.46 / yr$83M
14East Baton Rouge ParishLA
99.6
Very High 0.40 / yr$52M
15Jefferson CountyAL
99.6
Very High 1.17 / yr$56M
16Wayne CountyMI
99.5
Very High 0.28 / yr$44M
17Oklahoma CountyOK
99.5
Very High 0.86 / yr$54M
18Jackson CountyMO
99.5
Very High 0.38 / yr$62M
19Hamilton CountyOH
99.4
Very High 0.27 / yr$53M
20Douglas CountyNE
99.4
Very High 0.29 / yr$64M
21Montgomery CountyTX
99.4
Very High 0.89 / yr$62M
22DuPage CountyIL
99.3
Very High 0.23 / yr$67M
23Macomb CountyMI
99.3
Very High 0.21 / yr$59M
24Sedgwick CountyKS
99.3
Very High 1.02 / yr$53M
25Fort Bend CountyTX
99.2
Very High 0.77 / yr$59M

Showing the top 25 seeded counties for tornado risk.

Tornado Risk by State

DelawareNew JerseyCaliforniaConnecticutArizonaMassachusettsFloridaHawaiiSouth CarolinaWashingtonNew HampshireNew YorkPennsylvaniaNorth CarolinaOregonLouisianaAlabamaMarylandWisconsinNew MexicoMaineRhode IslandOklahomaArkansasOhioIllinoisTennesseeMississippiMissouriMichiganWest VirginiaTexasNevadaIndianaKentuckyMinnesotaColoradoIowaGeorgiaIdahoWyomingVermontUtahAlaskaVirginiaMontanaKansasSouth DakotaNebraskaNorth Dakota