The twister that hit El Reno, Oklahoma on Friday, killing 19 people, is now the widest tornado on record, according to a researcher with the National Weather Service.

Tornado researcher Howard Bluestein said the tornado that hit west of Oklahoma City and killed four storm chases, reached a maximum width of 2.6 miles. Bluestein said, “This is the biggest ever.”

The previous record holder for the widest tornado was an F4-rated twister that hit Hallam, Nebraska on May 22nd, 2004. Its maximum width reached 2.5 miles.

In addition to revising the width of Friday’s twister, the National Weather Service upgraded its rating from EF-3 to the highest-intensity rating of EF-5. Also, the death toll has now been updated to 19.