Tornadoes touched down in Texas and Louisiana as a powerful storm system that dumped heavy snow in California pushed through the Southern Plains and into the Deep South on Thursday, knocking out power to hundreds of thousands of people and forcing the cancellation of hundreds of flights into and out of the Dallas-area. Wind gusts of over 70 mph were reported in Texas as tornado watches were issued into Thursday night in the Dallas-Fort Worth area. National Weather Service teams planned to head out Friday to survey areas for likely tornado damage in the storm's path, which stretched from southeast Oklahoma into Texas and neighboring Arkansas and Louisiana.