Although the tornado remained over mostly open terrain, dozens of storm chasers unaware of its immense size and erratic movement were caught off-guard. The tornado killed four storm chasers (three professional and one amateur), the first known deaths in the history of storm chasing. Upon crossing Interstate 40, the tornado dissipated around 6:43 p.m. CDT (2343 UTC), after tracking for 16.2 miles (26.1 km), it avoided affecting the more densely populated areas near and within the Oklahoma City metropolitan area. Turning northeastward, the tornado soon weakened. 81, it had grown to a record-breaking width of 2.6 miles (4.2 km), beating the previous width record set in 2004. These are among the highest observed wind speeds on Earth, just slightly lower than the wind speeds of the 1999 Bridge Creek–Moore tornado. Remaining over mostly open terrain, the tornado did not impact many structures however, measurements from mobile weather radars revealed extreme winds up to 135.0 m/s (302 mph 486 km/h) within the vortex.
Central Daylight Time (2303 UTC) about 8.3 miles (13.4 km) west-southwest of El Reno, rapidly growing in size and becoming more violent as it tracked through central portions of Canadian County.
The tornado initially touched down at 6:03 p.m. This rain-wrapped, multiple-vortex tornado was the widest tornado ever recorded and was part of a larger weather system that produced dozens of tornadoes over the preceding days. Part of the tornado outbreak of May 26–31, 2013ĭuring the early evening of Friday, May 31, 2013, a very large and powerful tornado occurred over rural areas of Central Oklahoma. ~135.0 m/s (302 mph 486 km/h) (unofficial estimate) Ĭanadian County, Oklahoma especially areas to the south of El Reno View of the tornado from the southeast at 6:28 p.m. CDT (2328 UTC) as it was nearing peak strength
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