Godwin says the size and severity of the tornado won't be known until crews arrive to survey the damage.
Tornado warnings were in effect Monday morning in far eastern Arkansas near the Mississippi River as the storm system moved to the east. Seguin recently moved, so he he was not living in the residence at the time.More news: Johnson seeks another Parliament vote on Brexit deal
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The tornado did most of its damage in Dallas' Preston Hollows neighborhood - an affluent community that includes the home of former president George W. Bush and first lady Laura Bush.
One Dallas resident, Tina Devlin, told the station: "I heard all the snapping of the trees and the wind blowing, and so I climbed into this bedroom closet, and just as I got in there, the roof blew off". The cyclone was among several in the area that caused damage to homes and businesses, and knocked out electricity to tens of thousands people.
More than 167,000 electric customers were without power across Texas as of 6:30 a.m. local time.
Six schools across the Dallas Independent School District canceled classes Monday due to the extensive damage some of the campuses sustained in the storm, the district tweeted. A line of storms was moving east-southeast at 50 to 55 miles per hour Monday morning, the weather service said. There were reports of a gas leak in the Walnut Hill area of the city. About 65,000 of those customers were within Dallas, according to the city, which opened the Bachman Recreation Center early Monday morning for people seeking shelter.
Seven people escaped a structure that collapsed in northwest Dallas, but Dallas Fire-Rescue were searching to see if anyone was left inside, Evans said.