PRESS RELEASE

 

OKLAHOMA CITY, OKLAHOMA REMAINS THE

MOST TORNADO-PRONE CITY DURING MAY

 

May 4, 2012

 

As part of an ongoing company-funded research study of tornadic risk assessment, by means of the Site Assessment of Tornado Threat (SATT) software, Engineering Analysis Inc. (EAI) has determined the rankings of the top twenty tornado-prone cities for the month of May.  The rankings, based on National Weather Service data from 1950 through 2011, are as follows:

 

Annual Disturbed

Rank

City

ACF (%)

 Land Area (Acres)

1

Oklahoma City, OK

0.0940

756

2

Huntsville, AL

0.0376

302

3

Lincoln, NE

0.0345

277

4

Topeka, KS

0.0344

277

5

Tulsa, OK

0.0333

268

6

Minneapolis, MN

0.0299

240

7

Wichita, KS

0.0287

231

8

St. Paul, MN

0.0287

231

9

Overland Park, KS

0.0274

220

10

Kansas City, KS

0.0245

197

11

Kansas City, MO

0.0221

178

12

Lubbock, TX

0.0218

175

13

Independence, MO

0.0182

146

14

St. Louis, MO

0.0153

123

15

Springfield, IL

0.0131

105

16

Perioa, IL

0.0131

105

17

Houston, TX

0.0130

105

18

Birmingham, AL

0.0124

100

19

Pasadena, TX

0.0110

88

20

Sioux Falls, SD

0.0104

84

 

 

The ACF “Annual Coverage Fraction” represents the average fraction of land area within a 20-mile radius of the city disturbed by tornadoes during May for the 62–year period from 1950 through 2011.  This measure of tornado probability is consistent with the definition given in the FEMA Benefit-Cost Analysis Reengineering (BCAR) Tornado Safe Room Module Methodology Report.  The annual disturbed land area can be obtained by multiplying the ACF by the area within the 20-mile circle.

 


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