The first hurricane of the Atlantic season made landfall near Destin, Florida, the Miami-based National Hurricane Center said. It had maximum sustained winds of 105 mph (169 kph). The storm weakened to just below major hurricane status before it came ashore and by early Saturday was no longer considered a hurricane as its wind speeds continued to decrease.

"The storm is here. Buckle down at this point. Don't be getting out on the roads," Florida Gov. Ron DeSantis said at a news conference, adding that flash flooding would be a hazard "throughout the region."

Hurricane-force winds lashed the Gulf shoreline in the low-lying coastal area known for powdery white-sand beaches dotted with vacation homes, waterfront bars, and seafood shacks. Forecasters warned the conditions could also stir up tornadoes across the Florida Panhandle and into southern Georgia.

"We're watching it very closely, the hurricane," President Donald Trump told reporters at the White House late Friday night as he returned from a rally in upstate New York, adding that it was "under control."

Roads in Destin were flooded, while in nearby Pensacola, police warned residents to stay off the streets because of debris across roadways. While the extent of the damage was not immediately known, many area residents posted pictures online of downed trees and power lines, and one social media video showed a roof being ripped off an inn in Pensacola.

Some Panhandle counties temporarily suspended emergency response Friday night because of dangerous conditions.

Parts of southern Alabama also were flooded, with officials in Mobile reporting downed trees and power lines. Roads in Houston County, which is in the southeastern corner of the state, were closed because of similar conditions.

More than 664,000 customers in Florida and Alabama were without power early Saturday, according to poweroutage.com.

Many are braving Isaias at home

Tim Mowry, who rode out the storm from his home in Pensacola, said the wind was so intense it sounded like a train whistle as it whipped through a crack in his patio door. He lost power around 4:30 p.m. but was able to rely on a generator. Standing water also covered his backyard, and parts of his fence were ripped down, but overall he said the storm wasn't as bad as he expected.

"As far as Pensacola-wise, we really got fortunate," Mowry said.