Of the 18 or so tornadoes that ripped through Oklahoma on Monday, the two fatal ones were the strongest, packing winds up to 200 mph, the National Weather Service said.
On Friday, the National Weather Service used additional ground and aerial survey data to upgrade two of the six EF-3 rated tornadoes to an EF-4 rating.
The Moore-Choctaw tornado, which killed 55-year-old Wilbern Patterson, was rated as an EF-4 because of photographic evidence of a residential area near Interstate 40 and Choctaw near the spot where a recreational vehicle blew over on Patterson.
The Norman-Little Axe tornado, which resulted in the death of 29-year-old Tammy Rider, was upgraded because of damage assessments near the end of the tornado track.
Tornadoes are rated from 0 to 5 on the Enhanced Fujita Scale based on the damage they cause. An EF-3 twister has wind speeds of between 136 and 165 mph. An EF-4 tornado has wind speeds between 166 and 200 mph.
Despite a forecast of continued heavy rains today, emergency responders are still expecting a blitz of volunteers and affected homeowners taking advantage of the weekend to clean up or repair storm damage in some of the most hard-hit areas.
"We were originally expecting about 1,000 people, but I think someone said there may be 1,500,” District 2 Special Projects Manager Myles Davidson said.
Davidson said he’s not worried about the rain, because at 8 a.m. Friday in the middle of heavy rains, a group of 50 volunteers showed up ready to go to work helping clean up the storm damage.
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