V
ORTEK LLCAs 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 cities for the month of May. The rankings, based on National Weather Service data from 1950 through 2006, are as follows:
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|
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DISTURBED LAND |
|
RANK |
CITY |
ACF (%) |
AREA (ACRES) |
|
1 |
Oklahoma City, OK |
0.0549 |
442 |
|
2 |
Huntsville, AL |
0.0389 |
313 |
|
3 |
Lincoln, NE |
0.0375 |
302 |
|
4 |
Topeka, KS |
0.0368 |
296 |
|
5 |
Wichita, KS |
0.0298 |
240 |
|
6 |
Overland Park, KS |
0.0296 |
238 |
|
7 |
Kansas City, KS |
0.0259 |
208 |
|
8 |
Lubbock, TX |
0.0238 |
191 |
|
9 |
Independence, MO |
0.0232 |
187 |
|
10 |
Minneapolis, MN |
0.0220 |
177 |
|
11 |
St. Paul, MN |
0.0207 |
166 |
|
12 |
Kansas City, MO |
0.0189 |
152 |
|
13 |
St. Louis, MO |
0.0169 |
136 |
|
14 |
Tulsa, OK |
0.0157 |
126 |
|
15 |
Springfield, IL |
0.0143 |
115 |
|
16 |
Perioa, IL |
0.0142 |
114 |
|
17 |
Houston, TX |
0.0142 |
114 |
|
18 |
Birmingham, AL |
0.0127 |
102 |
|
19 |
Pasadena, TX |
0.0120 |
97 |
|
20 |
Sioux Falls, SD |
0.0113 |
91 |
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 57-year period from 1950 through 2006. The "disturbed land area" represents the average number of acres of land within a 20-mile radius of the city disturbed by tornadoes during May for the same 57-year period.