Among the latest deaths reported were two people who drowned while driving through high water near Simonton, Texas, 64 kilometres west of Houston, Major Chad Norvell of the Fort Bend County Sheriff's Office said on Twitter.
While the storm has officially weakened, Texas Governor Greg Abbott warned that "the worst is not yet over", reminding the public that the floods still pose a danger. It took Harvey between two and three days to drench southeastern Texas with record-shattering rainfalls, and Allison caused huge flooding over a five-day period.
Police in Harris County, home to Houston, said 17 people remained missing.
"You can't get anywhere by vehicle", said Troy Payne, 56, who had driven in from Atlanta.
Trump's Wednesday morning tweet comes the day after he traveled to Texas to meet with state and local officials.
As of Wednesday afternoon, Watt's fundraiser had brought in more than $6 million for Harvey relief - and it's still growing.
Trucks make their way through flood waters in Texas.
The minimal damage Trump did see - some boarded-up windows, uprooted trees and fences askew - was through the tinted windows of his SUV as he traveled from the Corpus Christi airport to a firehouse in a city that's already almost back to normal.
30,000 - 40,000: The estimated number of homes destroyed by floodwaters in and around Houston, according to Harris County Judge Ed Emmett.
It barreled through the U.S. fourth-largest city of Houston and has moved into the state of Louisiana earlier this week.
"We have been hearing popping noises, which is the organic peroxides decomposing", Moreno said.
Some 325,000 people and businesses already had applied for FEMA assistance and the agency already has paid out $57 million in aid, Brock said.
Officials said 911 centers in the Houston area are getting more than 1,000 calls an hour from people seeking help. Valero and Motiva, the largest refinery in the country, have also closed some facilities. "My deep freezer was in my living room", she said, her voice breaking.
Moody's Analytics is estimating the economic cost from Harvey for southeast Texas at $51 billion to $75 billion, ranking it among the costliest storms in US history.
Major dangers loomed over the U.S. Gulf Coast area Thursday with the continued threat of serious flooding near the Texas-Louisiana line and after a series of explosions at a flooded chemical plant, even as Harvey's floodwaters receded in the Houston area after days of torrential rain.
The storm's rainfall has been so intense that the NWS had to update color charts on their precipitation graphics in order to map Harvey effectively.
"The American people are with you", Vice President Mike Pence said during a visit to Texas.
This is an aerial view of a flooded neighborhood in New Orleans, Louisiana, on Thursday, Sept. 1, 2005, after Hurricane Katrina passed through the area.
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