VORTEK LLC

INDIANA REMAINS THE MOST TORNADO-PRONE STATE DURING APRIL

March 31, 2009

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 2007, are as follows:

 

RANK

 

STATE

 

ACF (%)

DISTURBED LAND

AREA (ACRES)

1

Indiana

.02126

4885

2

Oklahoma

.01382

6075

3

Tennessee

.01374

3623

4

Arkansas

.01080

3602

5

Iowa

.01042

3733

6

Mississippi

.00922

2784

7

Kansas

.00902

4723

8

Alabama

.00875

2844

9

Illinois

.00776

2760

10

Kentucky

.00738

1876

11

Michigan

.00538

1962

12

Missouri

.00511

2253

13

Louisiana

.00509

1448

14

Georgia

.00483

1798

15

Texas

.00477

8006

16

Ohio

.00451

1183

17

Nebraska

.00389

1905

18

Wisconsin

.00310

1078

19

North Carolina

.00230

719

20

Maryland

.00222

140

 

 

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 58-year period from 1950 through 2007. 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 58-year period.
 
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