VORTEK LLC

INDIANA REMAINS THE MOST TORNADO-PRONE STATE DURING APRIL

March 26, 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 by month of the top twenty tornado-prone states, with Indiana remaining the most tornado-prone state for the month of April. The rankings, based on National Weather Service data from 1950 through 2006, are as follows:

 

RANK

 

STATE

 

ACF (%)

DISTURBED LAND

AREA (ACRES)

1

Indiana

.02169

4983

2

Oklahoma

.01401

6160

3

Tennessee

.01394

3676

4

Arkansas

.01176

3921

5

Iowa

.01052

3770

6

Mississippi

.00936

2827

7

Kansas

.00901

4717

8

Alabama

.00877

2851

9

Illinois

.00790

2811

10

Kentucky

.00723

1837

11

Michigan

.00545

1988

12

Louisiana

.00520

1481

13

Missouri

.00504

2222

14

Georgia

.00470

1748

15

Ohio

.00458

1202

16

Texas

.00422

7076

17

Nebraska

.00358

1755

18

Wisconsin

.00317

1104

19

North Carolina

.00235

734

20

Florida

.00187

649

 

 

The "ACF" (Annual Coverage Fraction) represents the average fraction of land area within the boundaries of the state disturbed by tornadoes during April 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 April for the same 57-year period.
 
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