The Widest Tornadoes on Record

The widest tornado the United States has ever recorded measured 2.6 miles across — the May 31, 2013 El Reno, Oklahoma tornado, in central Canadian County. That figure comes from a Doppler-on-Wheels radar pass; the damage path on the ground was narrower, and the National Weather Service eventually rated the tornado EF3, not the preliminary EF5. The figure is real, but it is a measurement of circulation, not a measurement of where the destruction reached.

Two ways to measure how wide a tornado is

The Enhanced Fujita scale rates damage. Width, in NOAA's record, is the maximum width of the damage path — the distance from one edge of the destruction to the other at the tornado's broadest point. For most tornadoes this is straightforward: a survey team walks the corridor, marks the boundary where damage stops, and records the widest cross-section.

For tornadoes that cross open country, where there is little to damage, the width has to be inferred. The 2013 El Reno tornado was sampled by two mobile research radars — the University of Oklahoma's RaXPol and the Center for Severe Weather Research's Doppler on Wheels — both close enough to resolve the circulation in detail. Their data put the rotational diameter at 2.6 miles. The damage survey could find no structures hit by the embedded sub-vortices that the radar measured at 295 miles per hour. The final rating sat at EF3 because the engineering damage indicators in the EF scale could not support anything higher.

The El Reno entry below shows 2.6 miles wide and EF3. Both numbers are correct. Both measure different things.

What kills people in a tornado

The 2013 El Reno tornado killed eight people: three storm researchers in their vehicle (Tim Samaras of TWISTEX, his son Paul Samaras, and meteorologist Carl Young), a man in his vehicle near the airport, and four others sheltering on or near Interstate 40. The tornado's 2.6-mile width spared El Reno itself; the path missed the city by a few miles to the south.

The 2011 Joplin EF5, by contrast, was rated at 1,180 yards wide — about two-thirds of a mile, less than half the El Reno measurement — and killed 161 people. Width times path length tells you the area of damage. Lethality depends on what was in that area: schools, hospitals, mobile-home parks, anyone who couldn't reach an interior room. A two-mile-wide tornado over rangeland has far less reach into human life than a half-mile tornado that crosses a town center.

The widest tornadoes that did kill in significant numbers — the Hallam, Nebraska F4 in 2004 (one death), the Yazoo City, Mississippi EF4 in 2010 (10 deaths along its 149-mile track), the Mayfield, Kentucky EF4 in 2021 (57 deaths in the quad-state outbreak), the Bridge Creek-Moore F5 in 1999 — all combined width with path through population.

Two miles or wider: 6 tornadoes

The El Reno 2013 measurement is the canonical "widest tornado" — but it is a radar-derived width, not a damage path width, and the rating eventually settled at EF3, not EF5. The next four entries are the more direct comparison: peak damage path widths of 1.9 to 2.5 miles, established by ground survey.

1.5 to 2 miles wide: 26 tornadoes

Tornadoes in this band include the 2007 Greensburg, Kansas EF5 that destroyed roughly 95 percent of the town; the April 27 2011 Tuscaloosa-Birmingham EF4 that killed 64 along a 41-mile path; the December 10 2021 Kentucky quad-state EF4 that crossed Mayfield, Dawson Springs, and Bremen on a 165-mile track; and the May 24 2011 Canadian County, Oklahoma EF5 that started a few miles from where El Reno would form two years later.

1 to 1.5 miles wide (deadly or rated F4+ / EF4+): 81 tornadoes

There are several hundred tornadoes between one and one and a half miles wide in the record; this band shows the ones that either killed someone or rated F4 or higher on the damage scale. Most of the canonical historical wedge tornadoes — Joplin 2011, the 1974 Super Outbreak's Xenia and Brandenburg events, the 1965 Palm Sunday outbreak — sit in this width range. Width is what the headline reports; deaths and damage are usually a function of where the path crossed.

Notes on the data

NOAA's Storm Events Database splits a single tornado track across multiple county rows. The width recorded for each county row is the tornado's overall maximum width — the same value repeats across counties for the same event. The list above deduplicates on date + state + rating + width, keeping the row with the most fatalities, injuries, or longest path within the affected area. Each entry links to that county's NWS event narrative.

Pre-2007 tornadoes use the original Fujita scale (F0–F5); post-2007 tornadoes use the Enhanced Fujita scale (EF0–EF5). The width measurement convention has not changed across the scale transition. Width was added to the database systematically in 1973; for events before that year, the width field may be sparse or absent.

The 2013 El Reno radar-derived width remains the official record in NOAA's database. The wider literature on tornado measurement is unsettled: some references list the 2004 Hallam, Nebraska F4 (2.5 miles, 4,400 yards) as the widest tornado by damage path. Both events appear at the top of this list. Whether to treat radar-derived width as comparable to damage-path width is an open question for the survey community.