formed Tuesday in the Caribbean Sea and could strengthen into a major hurricane while moving north toward the U.S., forecasters said. Heavy rains and big waves already lashed the Cayman Islands, and some Florida residents filled sandbags days ahead of anticipated flooding.
Hurricane watches were issued for parts of Cuba, Mexico and a stretch of the Florida coastline, including Tampa Bay, the U.S. National Hurricane Center said. A tropical storm warning was issued for parts of the Florida Keys.
The storm was 170 miles (275 kilometers) southeast of the western tip of Cuba and had sustained winds of 45 mph (75 kph). It was expected to strengthen into Hurricane Helene on Wednesday as it approached the Gulf Coast and could become a major hurricane Thursday.
Florida Gov. Ron DeSantis declared a state of emergency Monday ahead of the storm's arrival on the state's Gulf Coast as soon as late Thursday and increased the counties included in the high-risk area Tuesday from 41 to 61.
READ MORE: Forecast and timeline: Tropical system could rapidly intensify and slam Florida
鈥淣ow is the time to If you鈥檙e in an evacuation zone, you should evacuate,鈥� said Lisa Bucci, a specialist at the hurricane center. 鈥淒on鈥檛 be fooled by the way the storm looks at the moment. We are expecting it to rapidly intensify.鈥�
People in regions under watches and warnings should be prepared to lose power and should have enough food and water for at least three days, she said.
The storm is expected to move over deep, warm waters that would fuel its intensification. 鈥淭his system will become quite large and powerful before landfall," the center said.
Helene, the eighth named storm of the Atlantic hurricane season, could strengthen into a major Category 3 hurricane 鈥� with winds of at least 111 mph (178 kph) 鈥� before approaching the northeastern Gulf Coast. Since 2000, eight major hurricanes have made landfall in Florida, according to Philip Klotzbach, a Colorado State University hurricane researcher.
Given the anticipated large size, wind and rain will extend far from the center of the expected storm, especially on the eastern side. The center warned of 鈥渋nland penetration of strong winds over parts of the southeastern United States after landfall.鈥�
Bucci said states including Tennessee, Kentucky and Indiana could see rainfall associated with the storm.
A tropical storm warning was in effect for Florida's Dry Tortugas; the lower Florida Keys west of the Seven Mile Bridge; Grand Cayman; Rio Lagartos to Tulum, Mexico; and the Cuban provinces of Artemisa, Pinar del Rio, and the Isle of Youth.
A storm surge watch was in effect for Florida's Tampa Bay, Charlotte Harbor and from Indian Pass south to Flamingo. A tropical storm watch was issued for the middle Florida Keys from the Seven Mile Bridge to the Channel 5 Bridge; Flamingo to south of Englewood; and from west of Indian Pass to the Walton Bay County line.
The National Weather Service in Tallahassee, Florida, urged people to take potential evacuations seriously.
鈥�10-15ft of surge is NOT survivable,鈥� it wrote on the social media platform X.
DeSantis said the storm is reminiscent of 2018's a Category 5 hurricane that rapidly intensified and caught many residents off guard before plowing a destructive path across the western Florida Panhandle. Communities still rebuilding from previous storms could get battered again, DeSantis warned.
鈥淲e are going to see significant impacts no matter what happens," DeSantis said Tuesday.
The sun shone Tuesday in Tarpon Springs, Florida, but residents already filled sandbags as they braced for potential flooding.
Officials in the Cayman Islands shuttered schools and airports as forecasters warned of heavy wind and rain and waves of up to 10 feet (3 meters).
Many in Cuba worried about the storm, whose tentacles are expected to reach the capital of Havana, which is struggling with a severe shortage of water and piles of uncollected garbage.
Overall, roughly 600,000 people in Cuba are experiencing water shortages, including more than 130,000 in Havana alone. also persist.
Helene is expected to slip through waters separating Cuba from Mexico鈥檚 Yucatan Peninsula early Wednesday and then head north across the Gulf of Mexico.
Up to 8 inches (20 centimeters) of rain is forecast for western Cuba and the Cayman Islands with isolated totals of 12 inches (30 centimeters). Up to 6 inches (15 centimeters) of rain is expected for the eastern Yucatan, with isolated total of more than 8 inches (20 centimeters).
Heavy rainfall also was forecast for the southeastern U.S. starting on Wednesday, threatening flash and river flooding, according to the National Hurricane Center. Up to 8 inches (20 centimeters) of rain was forecast for the region, with isolated totals of 12 inches (30 centimeters).
A storm surge of up to 15 feet (5 meters) was forecast from Ochlockonee River, Florida, to Chassahowitzka, and up to 10 feet (3 meters) from Chassahowitzka to Anclote River and from Indian Pass to Ochlockonee River.
Authorities in Mexico offered free ferry service to move tourists off the low-lying coastal island of Holbox. The offer was made Tuesday by Mara Lezama, the governor of the Caribbean coast state of Quintana Roo, home to resorts like Cancun, Playa del Carmen and Tulum. Holbox is known among tourists for its tranquil, shallow waters and flocks of flamingos. It is easily flooded.
Lezama said forecasters predict the storm is expected to move just offshore and not hit land in Mexico.
The Atlantic hurricane season runs from June 1 to Nov. 30. The National Oceanic and Atmospheric Administration has predicted an above-average Atlantic hurricane season this year . It forecast 17 to 25 named storms, with four to seven major hurricanes of Category 3 or higher.
In the Pacific, killed two people after it barreled into Mexico鈥檚 southern Pacific coast, blowing tin roofs off houses, triggering mudslides and toppling scores of trees, officials said Tuesday.
