Hurricane Harvey has knocked out power to nearly 300,000 customers along the Texas coast.
The Electric Reliability Council of Texas, which manages about 90 percent of the state's electrical grid, said there were 211,000 outages in the hours after Harvey made landfall.
In addition to power outages, emergency personnel in the areas northeast of Corpus Christi are experiencing the loss of cellphone service. Federally licensed radio hobbyists have activated a shortwave network along the Gulf Coast in case they are needed to cover interruptions in communications from Hurricane Harvey.
The National Hurricane Center released a statement Saturday morning saying that although Harvey's winds have begun to weaken, heavy rainfall and storm surge continue to threaten parts of Texas' coast.
"Catastrophic and life-threatening flooding is expected across the middle and upper Texas coast from heavy rainfall of 15 to 30 inches, with isolated amounts as high as 40 inches, through Thursday," according to the National Hurricane Center.
Residents in the path of the storm are urged not to drive on flooded roadways.
Corpus Christi's marina was left largely unscathed, despite being in the path of Hurricane Harvey when it made landfall.
Daybreak revealed some of the damage left behind, including an awning ripped from a restaurant entrance and a number of downed lamp posts and tree limbs.
Harvey came ashore along Texas' Gulf Coast overnight as the most powerful hurricane to hit the U.S. in more than a decade.
Hurricane Harvey is now a Category 1 storm, but still has the potential to bring catastrophic flooding to the region. The storm is expected to hover in the region for days and to dump as much as 40 inches of rain in some places.
Hurricane Harvey makes landfall
In other areas like the coastal community of Rockport, Texas, Hurricane Harvey left "widespread devastation."
Rockport Mayor Charles "C.J." Wax told The Weather Channel on Saturday that homes, schools and businesses were heavily damaged or destroyed by the storm.
He added that the city's emergency response system has been hampered by the loss of cell service in the area.
The city of Victoria, which is about 60 miles north of Rockport, suffered massive power outages due to Hurricane Harvey. Nearly 200,000 are without power in areas across the coast and inland, our San Antonio affiliate reported, citing AEP Texas.
The Associated Press and Sinclair Broadcast Group contributed to this report.