Sustained winds of 30-50 mph with gusts to 70 mph are possible.winds of 40-50 mph with gusts up to 70 mph will be possible.
The massive storm triggered evacuation orders for 5.6 million people, and made two landfalls Sunday.
Hurricane Irma officially made USA landfall at 9:10 a.m.at Cudjoe Key.
Ahead of Irma's arrival, some 6.5 million people in southern Florida, about a third of the state's population, had been ordered to evacuate their homes.
Irma crossed over the Florida Keys Sunday morning and was headed for the state's southwest coast with maximum sustained winds of 130 miles (215 kilometers) per hour, making it a risky Category 4 storm, the second worst on the Saffir-Simpson scale.
It killed at least 26 people before leaving the Caribbean for Florida.
Hundreds of Miami residents, many of whom chose to stay in the city during Irma, waited in line for hours Thursday to get bags of sand. "It was was like, 'Oh my God, what is going to happen?"'
As Hurricane Irma approaches Florida the point of impact is becoming more clear and it's better news for the city of Miami but not for Tampa.
In the Keys, where the storm roared ashore Sunday morning with winds of 130 miles per hour, video showed houses shoved from their foundations and boats tossed onto the pavement. "I know for our entire state, especially the Keys, it's going to be a long road".
Along with heavy winds from the storm, the metro area will see 3 to 5 inches of rain.
Emergency managers there declared "the Keys are not open for business" and warned that there was no fuel, electricity, running water or cell service and that supplies were low and anxiety high.
"What we feared the most was the surge", he said Monday on MSNBC.
North-eastern Florida cities including Jacksonville were facing flash flooding, with the sheriff's office pulling residents from waist-deep water.
"There is the danger of life-threatening storm surge flooding along portions of the coasts of Florida, Georgia and SC, where a Storm Surge Warning remains in effect". "You've got to be patient".
At least three deaths were reported in Florida in relation to the hurricane.
By Sunday morning, the Tampa-St.
That's because, in this hemisphere, a cyclone rotates counterclockwise, and on the east side of the storm, the "outer bands come on shore at an angle typically bringing winds from the southeast", CNN meteorologist Taylor Ward said.
In fact, people living hundreds of kilometres outside of the cone will feel Irma's wrath, with hurricane-force winds extending 200km in diameter.
The storm is still expected to travel through the state Georgia, into Alabama, and then into the Mid-South, based on the latest projections.