The largest tornado in recorded history was Friday's May 31, 2013 EF-5 tornado in El Reno, Oklahoma, the National Weather Service in Norman, Oklahoma announced on Tuesday. The EF-5 re ...

Look Inside Largest Tornado Ever With New Tool Software allows scientists to better understand the massive and deadly El Reno storm.

The tornado that touched down near El Reno, Okla., last week has been upgraded to an EF-5, with winds near the surface of 296 mph, the National Weather Service in Norman said Tuesday.

The National Weather Service upgraded the El Reno, Oklahoma tornado that hit late last week, killing 18 people, to an EF-5 tornado — the highest, most dangerous, rarest classification.

The El Reno tornado had several smaller internal vortices within the main circulation, Smith said, and they were racing along at up to 185 miles an hour. These miniature tornadoes did not hit any ...

New surveillance video gives a different perspective to the El Reno tornado. The camera was mounted on the Shell gas station at I-40 and Banner Road. The store suffered heavy damage in the tornado.

Four storm chasers died in the El Reno, Oklahoma, tornado one year ago this weekend -- a demonstration how unpredictable that historic storm was.

The American Meteorological Society has released a preliminary version of its after-action report on the El Reno, Oklahoma, tornado, which killed noted storm chaser Tim Samaras, his son Paul and ...

The El Reno Tornado was also given a rating of EF-5 with winds around 295 mph. In most cases, tornado intensity is estimated by looking at the damage caused by the tornado.

At its widest, the El Reno, OK tornado Friday, May 31, 2013 was 2.6 miles across.