The deadly tornado that hit Moore, OK has been given a preliminary rating of EF-4. Tornadoes of that magnitude have wind speeds of anywhere from 166-200 miles per hour.
F-4s/EF-4s are exceptionally rare for Louisiana. There have only been nine in the state since 1950. By comparison, Oklahoma has had 56 F-4s/EF-4s in the same period.
Oklahoma is about 1.6-times the size of Louisiana, but has had six-times more F-4s/EF-4s.
There is only one F-5/EF-5 on record in Louisiana. It happened in the northeastern part of the state on Feb. 21, 1971. Oklahoma has had seven F-5s/EF-5s.
Of the nine F-4s/EF-4s that have hit Louisiana, only two have occurred in the southern half of the state. The first happened Oct. 3, 1964 in Lafourche Parish. A total of 22 people died. Then, there was one Dec. 6, 1983 in St. John the Baptist Parish. There was no loss of life.
Of all the F-4s/EF-4s and F-5s/EF-5s (total = 63) for Oklahoma, all but one occurred in April or May. The 'odd' one happened in January.
Here's a point to note. For Louisiana's 10 strongest twisters (F-4s/EF-4s & F-5s/EF-5s):
February - 2
April - 3
October - 1 (Lafourche Parish twister - spawned by category 4 Hurricane Hilda)
November - 1 (Latest one for Louisiana - Nov. 29, 2010 in Winn Parish)
December - 3
For the Bayou State, the monsters are not "reserved" for spring. In fact, it's roughly a tie between spring and fall occurrences. Also, for the two F-4s in south Louisiana, neither was a spring storm.
And, the Lafourche Parish storm reminds us of the sometimes forgotten aspect of hurricanes. They DO spawn deadly tornadoes.
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