PRESS RELEASE

ENGINEERING ANALYSIS INC.

SIX STATES CONTAIN TWELVE OF THE TOP TWENTY TORNADO-PRONE CITIES (REVISED VERSION)

October 28, 2011

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 just completed its annual compilation of the most tornado-prone cities in the United States with populations in excess of 100,000 (based on 2010 US Census data). Each of six states (Oklahoma, Alabama, Kansas, Texas, Iowa, and Minnesota) contain two of these cities. Oklahoma City, Oklahoma remains the most tornado-prone city in the United States followed by Shreveport, Louisiana. The top twenty cities, with rankings based on the latest National Weather Service data for tornadic activity from 1950 through 2010, are as follows:

			Annual Disturbed
Rank	City	ACF (%)	Land Area (Acres)
1	Oklahoma City, OK	0.1612	1297
2	Shreveport, LA	0.1255	1010
3	Little Rock, AR	0.1197	963
4	Huntsville, AL	0.1145	921
5	Topeka, KS	0.1080	869
6	Jackson, MS	0.1007	810
7	Tulsa, OK	0.0924	743
8	Birmingham, AL	0.0712	572
9	Pasadena, TX	0.0708	570
10	Nashville, TN	0.0692	556
11	Lincoln, NE	0.0679	546
12	Minneapolis, MN	0.0665	535
13	Cedar Rapids, IA	0.0653	525
14	Cincinnati, OH	0.0625	503
15	South Bend, IN	0.0618	497
16	Wichita, KS	0.0599	482
17	St. Paul, MN	0.0597	480
18	Houston, TX	0.0578	465
19	Macon, GA	0.0562	452
20	Des Moines, IA	0.0493	396

The Annual Coverage Fraction (ACF) represents the average fraction of land area within a 20-mile radius of the city annually disturbed by tornadoes from 1950 through 2010. The annual disturbed land area can be obtained by multiplying the ACF by the area within the 20-mile circle.

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