PRESS RELEASE
MISSISSIPPI REMAINS
#1 AMONG TOP TWENTY
TORNADO-PRONE STATES
April 12,
2012
By means of
the Site Assessment of Tornado Threat (SATT) software, Engineering Analysis Inc. (EAI)
has just completed its annual compilation of the top twenty tornado-prone
states, based on the latest National Weather Service data for tornadic activity from 1950 through 2011. Mississippi retains it ranking as the
most tornado-prone state, followed by Alabama. The top twenty states are as follows:
|
Rank |
State .
|
ACF (%) |
Annual Disturbed Land Area (Acres) |
|
1 |
Mississippi |
0.0753 |
22605 |
|
2 |
Alabama |
0.0679 |
22051 |
|
3 |
Arkansas |
0.0599 |
19961 |
|
4 |
Oklahoma |
0.0572 |
25138 |
|
5 |
Kansas |
0.0496 |
25971 |
|
6 |
Nebraska |
0.0407 |
20024 |
|
7 |
Iowa |
0.0402 |
14374 |
|
8 |
Indiana |
0.0386 |
8861 |
|
9 |
Tennessee |
0.0366 |
9655 |
|
10 |
Georgia |
0.0321 |
11896 |
|
11 |
Louisiana |
0.0321 |
8949 |
|
12 |
Illinois |
0.0297 |
10565 |
|
13 |
Wisconsin |
0.0280 |
9732 |
|
14 |
Missouri |
0.0218 |
9611 |
|
15 |
Ohio |
0.0216 |
5661 |
|
16 |
North Carolina |
0.0208 |
6484 |
|
17 |
South Carolina |
0.0206 |
3970 |
|
18 |
Kentucky |
0.0192 |
4882 |
|
19 |
Pennsylvania |
0.0162 |
4647 |
|
20 |
Minnesota |
0.0160 |
8152 |
The Annual
Coverage Fraction (ACF) represents tornado probability based on the average
fraction of land annually disturbed by tornadoes within the boundaries of the
state 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 of the state.
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