Tropical Storm Harvey was set to make landfall again on Wednesday near the Texas-Louisiana border, adding more precipitation after a record rainfall that has caused catastrophic flooding and paralyzed the city of Houston.

The storm that first came ashore on Friday as the most powerful hurricane to hit Texas in more than 50 years has killed at least 17 people, forced tens of thousands of people to leave deluged homes and caused damage estimated at tens of billions of dollars, making it one of the costliest U.S. natural disasters.

There is some relief in sight for Houston, the fourth most populous U.S. city, with forecasters saying five days of torrential rain may come to an end as the storm that has lingered in the Gulf of Mexico, picks up speed and leaves the region later in the day.

Harvey was expected to produce an additional 6 to 12 inches (15 to 30 cms) of rain to the north and east of Houston as it moves into southwestern Louisiana. It is projected to weaken as it moves inland to the northeast and be over Mississippi by Thursday, the National Weather Service said.

“We aren’t going to be dealing with it for too much longer. It’s going to pick up the pace and get out of here,” said Donald Jones, a meteorologist at the National Weather Service in Lake Charles, Louisiana.

But nearly a third of Harris County, home to Houston, was under water, an area 15 times the size of Manhattan, according to the Houston Chronicle newspaper. It may take days for all flood waters, which have spilled over dams and pushed levees to their limits, to recede, local officials said.

City officials were preparing to temporarily house some 19,000 people, with thousands more expected to flee. As of Tuesday morning, nearly 50,000 homes had suffered flood damage, Texas officials said, and the tally is certain to rise.

Houston Mayor Sylvester Turner announced curfew from 12 a.m. to 5 a.m. amid reports of looting, armed robberies and people impersonating police officers.

U.S. President Donald Trump visited Texas on Tuesday to survey damage from the first major natural disaster to test his leadership in a crisis. The president said he was pleased with the response, but it was too soon for a victory lap.

“We won’t say congratulations,” he said. “We don’t want to do that…We’ll congratulate each other when it’s all finished.”

Moody’s Analytics is estimating the economic cost from Harvey for southeast Texas at $51 billion to $75 billion.

The unprecedented flooding has left scores of neighborhoods chest-deep in water and badly strained the dams and drainage systems that protect the low-lying Houston metropolitan area whose economy is about as large as Argentina’s.

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