U.S. F-Scale Tornado Trends

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Tornado F-Scale Trends

The Storm Prediction Center (SPC) has a tornado mapping program called Severe Plot.

The data archive with this program extends from 1950 through 2018.
I do not know when the data after 2018 will be added to Severe Plot by the SPC.

Remember that the original F-Scale system was replaced with the EF-Scale.  The two scales are equivalent, for example an older F-2 tornado, is considered to be the equivalent of the newer EF-2 scale tornado for intensity and damage. I will refer to all tornadoes in the archive as F-Scale tornadoes.

Using this data archive, I put the U.S. data into five-year totals working backward from 2018.

The frequencies of each F-Scale F-0 thru F-5 was totaled (see the table just below here) and graphed (found below the table) to determine if there were any trends in the frequencies of different F-Scale intensities of tornadoes in the U.S.

Table: U.S. Tornadoes by F-Scales in 5-year totals

F-0 F-1 F-2 F-3 F-4 F-5
1954-58 632 1213 1022 251 66 8
1959-63 648 1307 1033 243 36 2
1964-68 892 1441 1227 263 79 12
1969-73 1012 1994 1230 298 46 3
1974-78 1354 1992 974 279 80 14
1979-83 1844 2225 920 231 33 1
1984-88 2028 1782 590 168 45 3
1989-93 3722 2194 698 206 61 6
1994-98 4625 1845 568 154 35 5
1999-03 4590 1705 502 167 37 1
2004-08 5569 2373 626 172 26 2
2009-13 3913 2087 673 179 48 7
2014-18 3478 2324 495 115 16 0

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