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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]
The 2011 Super Outbreak was the largest tornado outbreak spawned by a single weather system in recorded history; it produced 367 tornadoes from April 25–28, with 223 of those in a single 24-hour period on April 27 from midnight to midnight CDT, [4] [11] fifteen of which were violent EF4–EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related.
The tornado reportedly killed three people, and passed through the villages of Welbourn, Wellingore, Navenby and Boothby Graffoe in Lincolnshire, and leveled large portions of each village. It is the strongest tornado on record in the British Isles. [150] This tornado is not documented by the European Severe Storms Laboratory. Jun 17: 1946 ...
Eleven years later, it remains the most recent tornado to be rated EF5, the strongest possible rating on the Enhanced Fujita Scale. The 11-year gap is the longest since official U.S. records began ...
The New Orleans metro area was struck by a strong tornado on this date in 2017, one of six tornadoes in southeast Louisiana. One was the area's strongest since the mid-20th century.
Powerful drill-bit tornado that was the strongest of the April 30-May 4 outbreak sequence. [116] 2024 Robert Lee, Texas tornado: 140 mph (230 km/h) May 3, 2024 0 Texas: NWS: Traveled 3.53 miles (5.68 km) and peak width of 350 yd (320 m). Tornado was originally rated high-end EF1 before getting upgraded in late August due to new damage findings ...
The most notable tornado outbreak of 2023 was the deadly and now historic outbreak that impacted large portions of the Midwest, South, and East U.S. on March 31 and April 1.
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 ...