A path of 85 miles would make it the longest-tracking tornado since May 18, 1995. A tornado with a path length of 78.3 miles swept through southeastern Oklahoma on May 15, 2003, and moved south of Texarkana along the Arkansas-Texas border.

A tornado that touched down in Brazoria County, Texas, struck some homes and other structures on Saturday, the authorities said. It was a day of tornado warnings in Texas, Louisiana and Mississippi.

At least two died as a severe weather system continued to move east, threatening to whip up tornadoes in parts of the U.S. Southeast.