Hurricane-force winds extend outward up to 60 miles mainly to the west of the center, and tropical-storm-force winds extend outward up to 415 miles.
Flash floods and up to 15 inches of rain were expected as the storm continued on its northwest path. So power outages are still possible in SC.
Irma has left more than 3.3 million without power in Florida, and continues to bring life-threatening storm surge and powerful winds. A tropical storm warning means tropical storm winds are expected within the area within the next 36 hours.
Meanwhile, the National Weather Service issued a storm surge warning for the SC coast through the northern border of Charleston County.
"The people of Florida need to know that our hearts and our prayers and all of our efforts are with them and will be with them until this storm passes", the vice president said.
That's because wind from the east side of Irma would be blowing toward Tampa, pushing water from the bay inland and raising the height of the storm surge, he said.
"It's the worst storm I've ever seen", said South, the NOAA meteorologist. That's 62 percent of the state's power customers, and there are several counties where 80-90 percent of customers are without power.More news: Storm Surge Swallows Jacksonville With Record Floods
Anxious relatives, generous volunteers and frantic neighbors turned to social media after Hurricane Irma wiped out electricity and cell service to many communities around Florida, cutting off most contact with remote islands in the Keys.
Hurricane Irma hit southwest Florida on Sunday, downing power lines, uprooting trees and turning streets into rivers.
Buckhorn said areas along the Tampa Bay shoreline could expect a unsafe storm surge anywhere from 3 to 8 feet, adding that it would depend on where Irma went.
So far, few images of the damage have popped up, as the storm takes its final breaths on Florida.
Puerto Rico says it collaborated with the U.S. Department of Health and Human Services to evacuate more than 1,000 people, mainly U.S. citizens, from St. Thomas and St. Maarten. Irma picking up speed Sunday night, reaching northern Florida and southwestern Georgia by Monday afternoon. with much of its power intact.
The governor said it was way too early to put a dollar estimate on the damage.
And in the Caribbean, which Irma devastated late last week, residents began what will likely be a years-long process of recovery and rebuilding after the storm tore across the region, killing at least 38 people and leaving the island of Barbuda "barely habitable".