DALLAS Nearly 250 homes across North Texas were damaged by tornadoes and flooding on Wednesday.

The American Red Cross said its surveys showed that four homes were destroyed; 86 homes suffered major damage; and another 156 homes suffered minor damage in the storms triggered by the remnants of Tropical Storm Hermine.

Gov. Rick Perry declared a disaster in 40 Texas counties that were impacted by the high winds and high waters.

In Dallas, the heaviest tornado damage was in an industrial area northwest of downtown.

Officials are keeping employees out of a building at West Mockingbird Lane and Irving Boulevard because the structure remains unstable.

The National Weather Service rated the funnel cloud that struck this location as an F2, with winds up to 115 mph.

A truck driver received a minor neck injury when his 18-wheeler was slammed against a building by the force of the tornado. He was released from a hospital on Thursday after receiving treatment.

The twister peeled off the roofs of several buildings and knocked down some walls. Parking lots are filled with debris and cinder blocks.

The Dallas tornado was one of seven that touched down across North Texas in the past two days. Six of those twisters came down in a span of little more than two hours on Wednesday.

WFAA reporter Monika Diaz contributed to this story.

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