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Prior to 1950 in the United States, only significant tornadoes are listed for the number of tornadoes in outbreaks. Due to increasing detection, particularly in the U.S., numbers of counted tornadoes have increased markedly in recent decades although the number of actual tornadoes and counted significant tornadoes has not. In older events, the ...
Tornado outbreak of June 27, 1953; May 1960 tornado outbreak sequence; Tornado outbreak sequence of April 23–30, 1961; Tornado outbreak sequence of May 14–31, 1962; Tornado outbreak sequence of June 1966; 1967 St. Louis tornado outbreak; Tornado outbreak of April 30 – May 2, 1967; 1968 Hansell-Charles City tornado; 1968 Oelwein tornado
2009: 1,147 0 695 348 82 20 2 0 2010: 1,282 0 768 342 127 32 13 0 2011: 1,713 0 802 629 198 61 17 6 2012: 948 0 583 241 94 26 4 0 2013: 916 0 499 309 80 19 8 1 2014: 929 0 510 321 71 20 7 0 2015: 1,178 0 691 401 65 18 3 0 2016: 974 30 530 311 75 26 2 0 2017: 1,418 67 615 594 127 13 2 0 2018: 1,121 15 619 400 75 12 0 0 2019: 1,529 179 655 540 ...
In late 2023, American meteorologist and tornado expert Thomas P. Grazulis created the Outbreak Intensity Score (OIS) as a way to rank tornado outbreaks. [1] [2] For the score, only significant tornadoes are counted: F2/EF2 tornadoes receive 2 points each, F3/EF3 tornadoes receive 5 points each, F4/EF4 tornadoes receive 10 points each, and F5/EF5 tornadoes receive 15 points each. [1]
This page documents confirmed tornadoes in October, November, and December 2020 via various weather forecast offices of the National Weather Service.Based on the 1991–2010 averaging period, 61 tornadoes occur across the United States throughout October, 58 through November, and 24 through December.
The weather service's Storm Prediction Center issued a tornado watch for far western Iowa counties around 11:15 a.m. Tuesday. A second watch, issued around 1:15 p.m. covered the rest of the state.
National Weather Service teams are assessing tornado damage after Friday's storms in Iowa. At least 17, including at least six EF2 tornadoes are confirmed.
The 49 tornadoes in both May and April are tied for the third most tornadoes in a single month in Iowa's history. December 2021 produced 63 tornadoes, which is the Iowa single-month record.