EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories. EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 to 200 mph EF5...Violent...>200 mph Note: The information in this statement is preliminary and subject to change pending final review of the event and publication in NWS Storm Data.