Hurricane Ian updates: Florida death toll climbs

Florida's electric providers said more than 2.3 million customers were without power at about 2 a.m. local time.

Florida Power & Light, the state's largest provider, reported more than 1.1 million outages for its 5.7 million customers.

“Hurricane Ian’s catastrophic winds will mean parts of our system will need to be rebuilt -- not restored,” the company said on Twitter late Wednesday. “Be prepared for widespread, extended outages as we are assessing the damage. We are already at work restoring power where we can do so safely.”

-ABC News’ Keith Harden

Portions of Fort Myers are under up to 4 feet of water, the city said late Wednesday night, and residents are being told to stay inside as first responders try and assess the damage from Hurricane Ian.

"We need to ensure that the roads are clear so that our first responders and our assistance crews can go out there and help everyone that needs us," the city wrote on Twitter. "PLEASE, please, please stay inside."

Jacksonville International Airport has canceled all flights for Thursday and the terminal will be closed.

-ABC News' Ahmad Hemingway

Ian continues to gradually weaken as it moves across the Florida Peninsula, now a Category 1 storm with maximum sustained winds down to 90 mph. The storm is moving to the north-northeast at 8 mph, and the center is currently about 70 miles south of Orlando.

While Ian is weakening, it's still bringing widespread dangerous weather impacts across the state.

-ABC News' Dan Peck