Hurricane Ian updates: Florida death toll climbs
Lee County, which encompasses Fort Myers, accounts for most of the fatalities.
The remnants of Ian are charging up the East Coast on Saturday after making landfall as a Category 1 hurricane in South Carolina on Friday afternoon.
The monster storm made its first U.S. landfall on Wednesday on Florida's west coast as a powerful Category 4 hurricane, shredding homes with ferocious winds topping 150 mph. Florida's death toll has climbed to at least 81, according to information from local officials.
Latest headlines:
5,000 Florida Guardsmen activated and prepping for Hurricane Ian
Florida Gov. Ron DeSantis has activated 5,000 Florida National Guardsmen to armories across the state in preparation for Hurricane Ian, which is forecast to hit the state on Wednesday.
Roughly 2,000 National Guard members from neighboring states such as Tennessee are also being activated to assist, the Florida National Guard said in a statement Tuesday.
"The Florida National Guard is well-equipped, with assets including high-wheeled vehicles, helicopters, boats, generators and more," the statement said.
The U.S. Navy has authorized non-essential personnel in various Florida counties to evacuate.
-ABC News’ Matt Seyler
Landfall forecast for Wednesday afternoon or evening
Hurricane Ian, barreling north toward Florida with 120 mph winds, is now located about 230 miles away from Sarasota.
Ian is expected to make landfall in Florida on Wednesday afternoon or early evening.
Ian's outer bands are already hitting South Florida, bringing a threat of heavy downpours, strong wind gusts, frequent lightning and even tornadoes. A tornado watch is in effect for South Florida until 5 a.m. Wednesday.
-ABC News’ Dan Peck
Walt Disney World, Universal Orlando to close
Walt Disney World and Universal Orlando will close Wednesday and Thursday due to the storm.
Coastal Georgia, South Carolina under tropical storm watches
As Ian moves north over Florida, tropical storm force winds will reach coastal Georgia and South Carolina.
Tropical storm watches have been issued for Savannah and near Charleston.
Georgia Gov. Brian Kemp has issued a state of emergency.
Gulf Coast, Tampa Bay area particularly vulnerable to hurricanes, expert says
Tropical Storm Ian is marching toward the Gulf Coast of the U.S., a region quite vulnerable to hurricanes.
The underwater geology of the Gulf of Mexico is what makes the Gulf Coast particularly unguarded to the massive influx of seawater, said Michael Brennan, acting deputy director of the National Hurricane Center, according to an article on Inside Science.
The symmetry of the Gulf of Mexico, with its shallow, sloping continental shelf, allows the storm surge to be pushed even higher onto land, Brennan told the outlet.
Because the land around the Gulf Coasts is typically flat, that exacerbates the flooding even more and allows the storm surge to travel farther inland, Brennan said.
"Of all of the hazards of hurricanes --- winds, rain, storm surges –-- surges are what can cause the largest loss of life," Brennan told Inside Science.
The Tampa Bay-St. Petersburg area, one of the regions bracing for Ian, is especially vulnerable to storm surge flooding but has avoided a direct hit from a strong hurricane since 1921.
Editor's Note: This post has been updated to reflect proper attribution to Inside Science.
-ABC News' Max Golembo