NEW : Six to 13 tornadoes touched down in north Texas , the NWS says . Texas mayor : `` We dodged a big bullet '' Among the most dramatic images of the day were from a freight truck depot on the south side of Dallas , where one twister flung semitrailers high in the air and hundreds of feet from their parking spots . Six to 13 of buildings are damaged and one of flights are canceled . `` It was like 'The Wizard of Oz , ' `` says Six to 13 witness .
NEW : Six to 13 tornadoes touched down in north Texas , the NWS says . Texas mayor : `` We dodged a big bullet '' Six to 13 of buildings are damaged and one of flights are canceled . `` It was like 'The Wizard of Oz , ' `` says Six to 13 witness .