Tropical Storm Imelda left two people dead after it dumped torrential rains over the Houston-area.
Reuters reports rescuers in boats pulled hundreds from flooded cars, and tens of thousands of people lost power.
Heavy rains had abated by Thursday evening, although flash flood watches remained in effect through Friday morning.
Rescuers were still working to reach stranded motorists and those trapped in homes late into the night as floodwaters were slow to drain off.
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