Oklahoma tornado was biggest ever recorded, National Weather Service says

Tornado at least 2.6 miles wide

NORMAN, Okla. - The tornado last Friday in Oklahoma that killed 18 people was a record-breaker in terms of size.

The National Weather Service said Tuesday that the El Reno tornado was at least 2.6 miles wide at one point, making it the widest tornado ever recorded.

The twister, which was originally rated at moderate strength, was also revised to the highest level on the intensity scale, an EF-5.

Forecasters said that the tornado had a maximum wind speed of 290 mph.

The tornado ravaged a primarily rural area west of Oklahoma City, traveling 16.2 miles, and was on the ground for about 40 minutes.

In addition to the 18 people who were killed, six more people remain missing.

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