The most powerful storm to hit Texas in more than 50 years has killed at least one person and is now threatening catastrophic flooding as search and rescue teams deploy to the hardest-hit zones, authorities said on Saturday.
Harvey slammed into Texas, the heart of the US oil and gas industry, late Friday as a Category 4 hurricane with winds of 209kmph, making it the strongest storm to strike the state since 1961.
It ripped off roofs, snapped trees, and triggered tornadoes and flash floods, and cut power to nearly a quarter of a million people. It also curtailed a large portion of America's oil and fuel production, prompting price hikes at the pumps.
Harvey has since weakened to a tropical storm, but is expected to lash Texas for days as it lumbers inland, bringing as much as 102cm of rain to some areas, and affecting heavily populated.
Houston could receive as much as 2 to 3 inches of rain per hour overnight, Mayor Sylvester Turner said late on Saturday. The National Hurricane Centre described the rain forecast for the state as potentially "catastrophic."
"Rainfall measured in feet rather than inches can certainly create a catastrophic flood," spokesman Dennis Feltgen said.
One person died in a house fire in the town of Rockport, 48km north of the city of Corpus Christi, as Harvey roared ashore overnight, Mayor Charles Wax said in a news conference on Saturday, marking the first confirmed fatality from the storm. Another dozen people in the area suffered injuries like broken bones, another official said.
The town took a direct hit from the storm and had streets flooded and strewn with power lines and debris on Saturday afternoon. At a recreational vehicle sales lot, a dozen vehicles were flipped over and one had been blown into the middle of the street. By Saturday evening, a convoy of military vehicles had arrived in the Rockport area with people and equipment to help in the recovery efforts, and town officials announced an overnight curfew for residents.
"It was terrible," resident Joel Valdez, 57, told Reuters. The storm ripped part of the roof from his trailer home at around 4am, he said as he sat in a Jeep with windows smashed by the storm. "I could feel the whole house move.”
Before the storm hit, Rockport's mayor told anyone staying behind to write their names on their arms for identification in case of death or injury. A high school, hotel, senior housing complex and other buildings suffered structural damage, according to emergency officials and local media. Some were being used as shelters.
Texas Governor Greg Abbott on Saturday said he was activating 1,800 members of the military to help with the statewide cleanup, while 1,000 people would conduct search-and-rescue operations.
The streets of Corpus Christi, which has around 320,000 residents, were deserted on Saturday, with billboards twisted and strong winds still blowing. City authorities asked residents to reduce use of toilets and faucets because power outages left waste water plants unable to treat sewage.
Elsewhere, the Texas Department of Criminal Justice said it was forced to evacuate some 4,500 inmates from three state prisons near the Brazos River because of rising water. Texas utility companies, meanwhile, said 220,000 customers were without power for an indefinite period of time.
The US Coast Guard said it had rescued 20 people from distressed vessels on Saturday, and was also monitoring two Carnival Corp cruise ships carrying thousands of people stranded in the US Gulf of Mexico due to the effects of the storm.
Harvey was a Category 4 hurricane on the Saffir-Simpson scale when it hit the coast, the second-highest category, and the most powerful storm in over a decade to come ashore anywhere in the mainland United States.