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 July. The rankings, based on National Weather Service data from 1950 through 2006, are as follows:
|
|
|
|
DISTURBED LAND |
|
RANK |
CITY |
ACF (%) |
AREA (ACRES) |
|
1 |
Minneapolis, MN |
0.01546 |
124 |
|
2 |
St. Paul, MN |
0.01338 |
108 |
|
3 |
Allentown, PA |
0.01010 |
81 |
|
4 |
Bloomington, MN |
0.00917 |
74 |
|
5 |
Albany, NY |
0.00675 |
54 |
|
6 |
Wilmington, DE |
0.00633 |
51 |
|
7 |
Lowell, MA |
0.00600 |
48 |
|
8 |
Fargo, ND |
0.00585 |
47 |
|
9 |
Philadelphia, PA |
0.00492 |
40 |
|
10 |
Davenport, IA |
0.00364 |
29 |
|
11 |
Gary, IN |
0.00337 |
27 |
|
12 |
Milwaukee, WI |
0.00329 |
26 |
|
13 |
Dayton, OH |
0.00270 |
22 |
|
14 |
Waterbury, CT |
0.00255 |
21 |
|
15 |
Lansing, MI |
0.00247 |
20 |
|
16 |
Youngstown, OH |
0.00210 |
17 |
|
17 |
Greenbay, WI |
0.00206 |
17 |
|
18 |
Hartford. CT |
0.00202 |
16 |
|
19 |
Cedar Rapids, IA |
0.00194 |
16 |
|
20 |
Naperville, IL |
0.00190 |
15 |
The Annual Coverage Fraction "ACF" represents the average fraction of land area within a 20-mile radius of the city disturbed by tornadoes during July 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 July for the same 57-year period.