A power generator tips in front of a hospital in Corpus Christi, Texas as Hurricane Harvey hit on Friday.

This photo made available by NASA shows Hurricane Harvey over Texas on Saturday, as seen from the International Space Station.

A couple walks their dog along Ocean Drive in Corpus Christi, Texas on Saturday. Hurricane Harvey hit the Texas coast late Friday as a Category 4 storm, damaging buildings and leaving tens of thousands without power.

As a preventative measure, empty Metro buses are lined up in the center lanes of Interstate 59 near Cavalcade in case their bus shelters flood.

A damaged car sits outside a heavily damaged apartment complex in Rockport, Texas..

A tattered U.S. flag whips in the wind in Geronimo, Texas, during Hurricane Harvey on Saturday.

A home damaged by Hurricane Harvey remains surrounded by flood waters.

Antonio Barron, right, looks back to his girlfriend, Melissa Rocha, as they run through the street during a band of heavy rain.

The Bayfront Seafood restaurant is surrounded by floodwaters.

A truck is flipped over after Hurricane Harvey landed in the Coast Bend area on Saturday.

A laundromat's machines sit exposed in the elements after Hurricane Harvey ripped through Rockport, Texas, on Saturday. The fiercest hurricane to hit the U.S. in more than a decade spun across hundreds of miles of coastline where communities had prepared for life-threatening storm surges — walls of water rushing inland.

A vehicle sits in standing water after Hurricane Harvey ripped through Rockport, Texas, on Saturday, Aug. 26, 2017. The fiercest hurricane to hit the U.S. in more than a decade spun across hundreds of miles of coastline where communities had prepared for life-threatening storm surges, walls of water rushing inland.

A man checks on a boat storage facility that was damaged by Hurricane Harvey.

Henry Isaac cuts down broken tree limbs after Hurricane Harvey Saturday, Aug. 26, 2017, in Missouri City, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and intense rain. Associated Press/David J. Phillip

Victor Garza helps remove a van from flood water left by Hurricane Harvey, Saturday, Aug. 26, 2017, in Aransas Pass, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and intense rain. Associated Press/David J. Phillip

A road remains flooded after Hurricane Harvey ripped through Rockport, Texas, onSaturday, Aug. 26, 2017. The fiercest hurricane to hit the U.S. in more than a decade spun across hundreds of miles of coastline where communities had prepared for life-threatening storm surges, walls of water rushing inland.

A contractor walks over debris from Hurricane Harvey Saturday, Aug. 26, 2017, in Missouri City, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind wind and intense rain. Associated Press/David J. Phillip

A boat sits capsized in the Rockport marina after Hurricane Harvey ripped through Rockport, Texas, on Saturday, Aug. 26, 2017. The fiercest hurricane to hit the U.S. in more than a decade spun across hundreds of miles of coastline where communities had prepared for life-threatening storm surges, walls of water rushing inland.

A truck in flood waters passes a home damaged in the wake of Hurricane Harvey, Saturday, Aug. 26, 2017, in Aransas Pass, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and heavy rain.

An overturned trailer sits in a park in the wake of Hurricane Harvey, Saturday, Aug. 26, 2017, in Aransas Pass, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and rain so intense that drivers were forced off the road because they could not see in front of them.

A drives moves through flood waters left behind by Hurricane Harvey, Saturday, Aug. 26, 2017, in Aransas Pass, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and heavy rain.

A tree blocks a street as Hurricane Harvey makes landfall in Corpus Christi, Texas, on Friday, Aug. 25, 2017. Hurricane Harvey smashed into Texas late Friday, lashing a wide swath of the Gulf Coast with strong winds and torrential rain from the fiercest hurricane to hit the U.S. in more than a decade.