Engineering Analysis Inc. has just completed its annual compilation of the top twenty tornado-prone states based on US Weather Service data for tornadic activity from 1950 through 1997. Mississippi again ranks number one as the most tornado-prone state. The top twenty states are as follows:
Rank State Annual Coverage Fraction 1 Mississippi 4.80 · 10-04 2 Kansas 4.41 · 10-04 3 Oklahoma 4.35 · 10-04 4 Nebraska 4.33 · 10-04 5 Arkansas 4.30 · 10-04 6 Indiana 4.12 · 10-04 7 Iowa 3.68 · 10-04 8 Alabama 3.20 · 10-04 9 Illinois 3.09 · 10-04 10 Wisconsin 2.98 · 10-04 11 Georgia 2.45 · 10-04 12 Tennessee 2.36 · 10-04 13 North Carolina 2.08 · 10-04 14 Ohio 1.82 · 10-04 15 Louisiana 1.75 · 10-04 16 Kentucky 1.72 · 10-04 17 Pennsylvania 1.65 · 10-04 18 Michigan 1.64 · 10-04 19 Missouri 1.60 · 10-04 20 Texas 1.41 · 10-04