Expect 4-6 feet (1.2-1.8 meters) above normal high tide levels. Florida's Governor Rick Scott said Sunday, "We have never had anything like this before". More than one million residents have no power.
The National Weather Service issued tornado warnings for a wide swath of Monroe, Miami-Dade and Broward counties in South Florida.
The city of Tampa and the surrounding areas came face to face with Hurricane Irma on Sunday night after days of wondering how strong her wrath would be.
Catastrophe modeling firm AIR Worldwide has estimated the storm has already done about $20 billion to $40 billion damage to insured property in Florida.
American Airlines began shutting down operations in Miami, Fort Lauderdale, Fort Myers, Sarasota and West Palm Beach by Friday afternoon and cancelled flights through the weekend.
Up to 6.5 million people have been ordered to evacuate the area - one of the biggest evacuations in United States history - as the storm engulfed the region.
"Truthfully, the whole state of Florida is in trouble".
Miami International Airport halted passenger flights through Monday with over 3,500 flights affected due to the storm. Prime Minister Gaston Browne of Antigua and Barbuda said 95 percent of Barbuda's buildings were destroyed or severely damaged.
Waves crash at the Southernmost Point marker in Key West, Fla., on Saturday.
So when he ran into a blocked road in Kendall, Florida, he got out of his vehicle, brought out his ax and started chopping away at downed trees blocking the roadways, CBS Miami reports.
"They're putting their lives in danger", Lee said. We can hear the wind battering the door and trees outside. "Right now, we're just urging everybody to stay indoors, to seek shelter".
Storm surge is caused when the winds from the hurricane literally push the ocean onto the shore. "It's hard to believe anybody will survive that", he told NBC News' TODAY show. "President Trump has promised me all the federal resource I need", Scott said of the devastation. "We're going to take care of everybody", he said.
In Mayport, a surge of 5.5 feet was reported.
Irma continues its slog north along Florida's western coast having blazed a path of unknown destruction.
As of the 1:00 pm ET advisory, Hurricane Irma is a Category 4 hurricane with sustained winds of 130 miles per hour moving at 9 miles per hour to the north.
How many people were evacuated?