VORTEK LLC

MARYLAND IS THE MOST TORNADO-PRONE U.S. STATE DURING JULY

June 24, 2008

As part of an ongoing company-funded research study of tornadic risk assessment, by means of the Site Assessment of Tornado Threat (SATT) software, VorTek has determined the rankings of the top twenty tornado-prone states for the month of July. The rankings, based on National Weather Service data from 1950 through 2006, are as follows:
 

 

 

 

Disturbed Land

Rank

State

ACF (%)

Area (Acres) 

1

Maryland

0.00347

219

2

Nebraska

0.00293

1438

3

Illinois

0.00275

978

4

Wisconsin

0.00231

804

5

Iowa

0.00221

794

6

Minnesota

0.00172

874

7

Ohio

0.00163

427

8

New Jersey

0.00159

76

9

Michigan

0.00152

554

10

Massachusetts

0.00146

73

11

New York

0.00138

420

12

Kansas

0.00126

662

13

Connecticut

0.00122

38

14

Pennsylvania

0.00122

350

15

North Dakota

0.00112

495

16

South Dakota

0.00111

541

17

Vermont

0.00092

54

18

Wyoming

0.00083

516

19

Indiana

0.00076

175

20

Kentucky

0.00059

149

 

 

The Annual Coverage Fraction "ACF" represents the average fraction of land area within the boundaries of the state disturbed by tornadoes during July for the 57-year period from 1950 through 2006. The "disturbed land area" represents the average number of acres of land within the boundaries of the state disturbed by tornadoes during July for the same 57-year period.