The National Weather Service says a tornado that touched down in Eastland County Saturday was an EF-3 on the Enhanced Fujita scale.
Severe EF-3 tornadoes can have wind speeds up to 165 mph.
One woman was killed Saturday when a storm destroyed her home in Cisco. A second person inside the home was severely injured.
Several other people in the sparsely populated farming and ranching community were unaccounted for Saturday night.
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Eastland County Judge Rex Fields said Saturday that there was a five-mile trail of destruction south of Cisco caused by the storms.
The NWS said more detailed information about the tornado would be forthcoming.