Idalia updates: Damaging tornadoes, severe flooding from Florida to Carolinas

ABC News Chief Meteorologist Ginger Zee, who's in Treasure Island, Florida, near St. Petersburg, as Hurricane Idalia hits, said on "GMA3" that she's concerned about more flooding during high tide, which is around noon ET.

"Through the afternoon and early evening, if you can, avoid travel around the areas that are already flooded," Zee said.

She also stressed the dangers of storm surge, which she said can "twist buildings off of their foundations and roll them down the street."

"I've seen it with my own eyes several times," she said.

Zee predicted Charleston and Savannah are "the next places we're going to see big water piling up like this."

"My concern really through the afternoon goes into South Carolina and coastal Georgia, and eventually tomorrow into North Carolina," she said.

More than 286,000 customers are without power in Florida as Hurricane Idalia hammers the state.

Idalia has weakened to a Category 1 hurricane with 90 mph winds hours after it made landfall as a powerful Category 3.

High water levels are ongoing along Florida's Gulf Coast as Idalia's center crosses into southern Georgia.

Libby Greg captured on camera the moment 40-foot trees snapped in half in her yard in Perry, Florida, in the Big Bend region.

One of the trees fell on the house and her child screamed out. But the family is safe, Greg told ABC News.