National Weather Service teams are surveying parts of the Houston area to determine if tornadoes are responsible for damage to homes and a suburban shopping mall. Some roads flooded and nearly 20,000 Houston-area residents lost power on Jan. 9 during powerful thunderstorms. CenterPoint Energy reported only about 300 customers still without electricity on the following day. Weather teams will examine storm damage near Sugar Land and to the Mall of the Mainland in Texas City, about 40 miles southeast of Houston.