The League City Police Department, located about 30 miles south of Houston, posted on Facebook that it was looking \"for people with flat bottom or low water boats to assist with rescue and evacuation.\"

\"Please send LCPD a Facebook message with name, phone number, location of boat, length and style of boat if you can be mobile with your boat and are experienced in operation of the boat,\" the League City police wrote.

The Houston mayor said this evening that the majority of the city's homeless are off the streets and in shelters.

As of late Sunday night, the U.S. Coast Guard said it had conducted more than 200 rescues by air in the area and more than 1,000 rescues by water.

More rain is likely coming

Texas Gov. Greg Abbott said at a news conference Sunday afternoon that as the heavy rains are expected to persist, which will lead to even more flooding, people are urged to stay off the roads.

Residents are also asked to keep a lookout for tornado warnings, which may pop up in the region in the coming days.

\"PHOTO:
DroneBase via AP
PHOTO: Flooding on West Bellfort Avenue in Houston, Aug. 27, 2017. The remnants of Hurricane Harvey sent devastating floods pouring into Houston as rising water chased thousands of people to rooftops or higher ground.
>

Houston Mayor Sylvester Turner said the city is not out of the woods yet. This is only the second day of what could become three or four or five difficult ones, he said, while urging Houstonians not to tire and to remain vigilant.

Judge Ed Emmett of Harris County, in which Houston is located, said this evening that as night falls, rescue operations will continue and become more difficult.

He urged stranded residents to try to reach their roof if possible, where rescuers can spot them.

He said his biggest concern is reaching those who are trapped and getting them to shelters. Dozens of shelters are set up at buildings including churches and mosques, he added.

Officials respond

President Trump tweeted about the storm this morning, saying \"experts are calling #Harvey a once in 500 year flood,\" but that the United States had \"an all out effort going\" in response to it.

The response included the deployment of 3,000 national and state guard service members, 500 vehicles and 14 aircraft, officials said.

Four hundred people have been deployed by the U.S. Department of Transportation in response to the danger, officials said, and 250 highway closures were established statewide.

\"PHOTO:
Janet Weinstein / ABC News
PHOTO: Rockport, Texas has been hard hit by Hurricane Harvey's wrath of torrential rain and high wind, Aug. 26. 2017.
>

ABC News' Brittany Borer, Lucien Bruggeman, Mary Bruce, Christopher Donato, Erin Dooley, Melissa Griffin, Michael Kreisel, Jonah Lustig, Daniel Manzo and Brendan Rand contributed to this report.

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