A powerful storm system took aim at the Gulf Coast on Tuesday, spawning a tornado that downed utility poles and power lines, overturned vehicles and ripped roofs off homes in communities east of Houston. There were no immediate reports of serious injuries. The National Weather Service had issued a tornado emergency for that area, warning that a “large, extremely dangerous and potentially deadly tornado” was on the ground Tuesday afternoon and was headed toward Baytown, about 25 miles east of Houston. The warning expired as the system moved to the east. The storm damaged commercial buildings, homes and power lines in nearby Pasadena, a city southeast of Houston. Utility poles and power lines were downed, and several vehicles, including a trailer, were damaged or flipped over in a parking lot. Footage from Houston TV stations showed several businesses suffered major damage, including the city’s animal shelter. Nearby, fences were laid over and shingles and sections of roofs were torn from homes, but there were no immediate reports of injuries. In Baytown, there were downed power lines and damage to homes and businesses, but no reports of serious injuries, said Baytown spokesperson Jason Calder. Shell Chemicals’ site in nearby Deer Park…