June 11, 2013
That mammoth tornado near El Reno, Okla. — the one that outsized the Hallam, Neb. tornado for widest ever — may not retain its EF5 rating.
That's because researchers have believed the maximum ground-level wind speeds from a tornado are slightly higher than 200 mph, said Ernest Kiesling, an expert in tornado shelters and researcher at Texas Tech University. Texas Tech is the premier institute studying tornado damage and shelters.