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Forecasters said Wednesday that Helene has strengthened into a hurricane as it enters the Gulf of Mexico. They warn that it is poised to continue intensifying as it hurtles toward Florida, where it is expected to make landfall late Thursday.

The storm is expected to bring "life-threatening storm surge, damaging winds and flooding rains to a large portion of Florida and the southeastern United States, according to the 

"Preparations to protect life and property should be completed by early Thursday since tropical storm conditions are expected to begin within this area on Thursday,” the NHC said.

Helene, which reached tropical storm status shortly after forming in the northwestern Caribbean Sea on Tuesday, is forecast to pass between the Yucatán Peninsula and the western part of Cuba on Wednesday. 

 Helene has strengthened slightly, with sustained winds of 85 mph as it moves through the Gulf of Mexico. However, this still makes it a 

The NHC said Helene is now forecast to be a “major” category 4 storm with winds of 130 mph at landfall. In addition, the potential “catastrophic and deadly storm surge” has increased to as much as 20 feet.

Forecasters warn that the storm, fueled by 

 Gulf waters, will get even stronger before it reaches land.

"There is still some uncertainty on exactly how strong Helene will get, and upward adjustments to the forecast intensity could be required in subsequent advisories if Helene rapidly intensifies more than forecast," they said. "Regardless, Helene is forecast to be a large major hurricane when it reaches the Big Bend coast of Florida."

The NHC says the "large size of Helene" — with tropical-storm-force winds stretching 400 miles across — poses a danger of life-threatening storm surge along the entire west coast of the Florida Peninsula and Florida's Big Bend (the northern region where the panhandle meets the peninsula), which is where the highest inundation levels are expected.

“The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline,” it says, warning that the Ochlockonee River could see a peak surge as high as 10 to 15 feet.

Forecasters also warn of damaging hurricane-force winds along portions of the Big Bend.

But, they say the impacts may be felt far outside the cone, with 

While hurricanes typically weaken quickly after landfall, Helene may remain a hurricane for 12 hours or more as it barrels north, threatening trees and power lines in areas far from the coast that may not be used to strong tropical systems. There are 

 not just along Florida's shoreline but also far inland, from Atlanta to the Carolinas. 

As of midday Wednesday, a hurricane warning is in effect for parts of Florida from the Anclote River to Mexico Beach, meaning hurricane conditions are expected within 36 hours. A hurricane watch is in effect from Englewood to Anclote River, including Tampa Bay, signaling that hurricane conditions are possible within 48 hours.

Tropical storm warnings are also in effect for the Upper Florida Keys, southern Florida Peninsula and northeast coast of Florida. The NHC has also extended them westward along the Florida Gulf coast and northward along the Georgia and South Carolina coasts.

 says Wednesday is the last full day for people to 

. This includes making an emergency kit, reviewing an emergency plan and signing up for 

check whether they live in an evacuation zone

According to the state's Division of Emergency Management, more than 20 Florida counties were either under 

 as of Wednesday morning. The Division is also offering assistance 

 for 61 counties (out of 67) on Tuesday, allowing officials to make resources available before the storm. President Biden also 

 that Florida has 18,000 linemen—and counting—staged, as well as search and rescue and roadway clearing crews at the ready.

“As always, Florida will prepare for the worst and hope for the best,” he added.

announced it will close and suspend all flights

 starting at 2 a.m. Thursday and will reopen to the public on Friday following a damage assessment.

Several institutions of higher education, including the 

 are canceling classes and closing their campuses on Thursday and, in some cases, through the weekend.

 that was supposed to send crew members to the International Space Station on Thursday. Instead, they say it will happen no sooner than Saturday.

Southern states are bracing for impact, too

Current models of Helene’s path show the storm moving inland, passing through Georgia and parts of Alabama, Tennessee and Kentucky through the weekend. Even though the storm is due to make landfall in Florida, officials warn that these areas will likely see significant rainfall, winds and power outages, too.

The NHC warns that "devastating" hurricane-force winds are expected across parts of northern Florida and southern Georgia as the center of the storm travels away from the coast. 

"Because of Helene’s expected fast forward speed, damaging and life-threatening wind gusts, are expected to penetrate well inland over portions of the southeastern United States, including in the higher terrain of the southern Appalachians," it says. 

A tropical storm watch is in effect for the South Carolina coast, north of the Savannah River.

"We don't normally issue tropical storm watches this far inland, especially here over the Appalachians area," National Hurricane Center Deputy Director Jamie Rhome said 

. "That's unusual; you really need to pay attention."

From Wednesday through Friday, potentially life-threatening flash flooding and urban flooding are expected across parts of Florida, the Southeast, the Southern Appalachians and the Tennessee Valley.

“This includes the risk of landslides across the southern Appalachians,” the NHC says.

The National Weather Service has already issued a rare "

" notice for the southern Appalachians on Thursday, warning of rain totals from 5 to 10 inches. It says tornadoes could occur Wednesday night over parts of the western Florida Peninsula and southern Alabama, with the risk increasing on Thursday and expanding across Florida and into parts of Georgia and South Carolina.

Virginia Gov. Glenn Youngkin also declared a state of emergency for the commonwealth Wednesday evening.

Youngkin, in a statement, said that while Helene's current path impacts counties in the western part of the state, residents in those areas could “experience significant rainfall and flooding” Friday into Saturday.

"... we cannot ignore the fact that we have had significant flooding events arise from pre-cursory rain events and outer bands from tropical systems that drop locally heavy rainfall leading to flooding, especially in our southwestern region,” Youngkin said. “It is critical that we remain vigilant, understanding that tracks and impacts can shift."

Georgia Gov. Brian Kemp has declared a state of emergency, and 

 of a “fast-moving” storm that could bring rainfall statewide, as well as high winds and significant power outages in certain areas.

The Georgia Emergency Management and Homeland Security Agency is telling residents to shelter in place and be ready to live without power for at least 72 hours.

Major League Baseball announced that Wednesday's and Thursday’s doubleheader between the New York Mets and the Atlanta Braves has been postponed due to the impending storm. The league says the games will be made up on Sept. 30 in Atlanta.

Even farther north, North Carolina Gov. Roy Cooper declared a state of emergency on Wednesday afternoon, citing Helene's potential to "seriously disrupt essential utility services and systems."

In addition, South Carolina Gov. Henry McMaster 

 in preparation for Helene's potential effects. In a statement, McMaster urged South Carolinians to monitor forecasts and take precautions before the storm.

"This State of Emergency ensures that Team South Carolina has the necessary resources in place to respond to these potential impacts," McMaster said. 

"Although South Carolina will likely avoid the brunt of Hurricane Helene's impacts, the storm is still expected to bring dangerous flooding, high winds, and isolated tornadoes to many parts of the state," he added.

Deputy National Editor Russell Lewis contributed to this report. 

Rachel Treisman

Author

Jonathan Franklin

Helene is forecast to intensify rapidly over the Gulf of Mexico before making landfall in Florida on Thursday. Residents are urged to make preparations — and in many counties, evacuate — before then.

Helene has strengthened and now forecast to be a ‘major’ Category 4 storm

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