Oklahoma tornadoes: NWS upgrades 3 tornadoes from EF-3 to EF-4
Three of the seven tornadoes that struck Oklahoma and killed 10 people this week have been upgraded from EF-3 to EF-4. A fourth tornado has now been rated an EF-2.
An EF-4 tornado has wind speeds of 166 to 200 mph and is the second highest rating for tornadoes.
The weather service on Friday said EF-4 tornadoes were produced Tuesday from one storm that stretched from Binger to Guthrie, a second from Chick...
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