A storm surge watch is in effect from east of High Island, Texas, to west of Holly Beach. Compared to the tens of thousands of calls, the center received just a handful of texts.
New Orleans officials planned to reopen government buildings and public schools Wednesday, a day after they were shut down amid fears of flooding rain from Harvey.
The powerful storm rolled into its sixth day Wednesday, although Harvey started losing steam as it reached Louisiana.
Bullock said that despite the current political divide and turmoil in the country, she hopes that, at the very least, the storm provides an opportunity for Americans to unite. With the water still high in places and many hard-hit areas still inaccessible, those numbers seemed certain to increase. "This was of epic proportion".
"We are in this for the long haul", acting Homeland Security Secretary Elaine Duke told reporters in a Wednesday briefing on emergency operations.
Nearly a third of Harris County, home to Houston, is currently underwater - an area 15 times the size of Manhattan.
More than 17,000 people have sought refuge in Texas shelters and around a dozen have been reported dead after a hurricane and mass flooding ripped through the state.
The hurricane center said Harvey should weaken to a tropical depression by tonight.
But the NWS posted a warning on its Twitter account asking people to avoid going out and sightseeing as the weather improves. Some are getting results, though not always positive ones. As many as 1,500 patients have been transferred.
A petrol station submerged under flood waters from Tropical Storm Harvey in Rose City Texas
But much of the damage will not be covered by insurance because flood coverage can be difficult or too expensive to obtain. Beaumont is just northwest of Port Arthur.
So he decided he would do what he could, setting up an online fundraiser for Houston with an initial goal of $200,000, and pledging $100,000 of his own money to get the donations started.
Forecasters said there was a risk of tornadoes across a large part of the South as Harvey trudged northeast toward northern Louisiana.
The massive storm touched down as a Category 4 hurricane on Friday, dumping several inches of rain on the Texas Coastal Bend. "Please keep him, his family and the Creek Wildcats in your thoughts during this tragedy", the tweet said.
For the first time since the weekend, authorities say the floodwaters that turned Houston into a city of rivers are slowly receding in some areas.
But the order exempts emergency responders, flood relief volunteers and late shift workers, as well as people seeking shelter.
Houston Police Sergeant Steve Perez died on his way to work Sunday, Houston Police Chief Art Acevedo said Tuesday afternoon.
"They need to get out". She gave the same amount to the organization in 2004 after a tsunami in Indonesia and again in 2005, following Hurricane Katrina in New Orleans.
However, the dangers remain far from over.