(Bloomberg) – Tropical Storm Harvey has drifted back into the Gulf of Mexico after crippling Houston and is poised regain strength before crashing ashore again, this time on the Texas-Louisiana border.

Harvey drenched Houston, the fourth-largest U.S. city, with as much as 30 inches (76 centimeters) of rain. More than 30,000 people will need shelter as a result of the storm, according to a government estimate.

The downpours are forecast to last through the week and an additional 15 to 25 inches could fall, the National Hurricane Center said in a 7 a.m. advisory. Heavy rain could spread to the Texas hill country and Louisiana, including New Orleans.

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