TALLAHASSEE, Fla. (AP) 鈥� Fast-moving Hurricane Helene was advancing Thursday across the Gulf of Mexico toward Florida, threatening an 鈥渦nsurvivable鈥� storm surge in northwestern parts of the state as well as damaging winds, rains and flash floods hundreds of miles inland across much of the southeastern U.S., forecasters said.
Helene is expected to be a major hurricane 鈥� meaning a Category 3 or higher 鈥� when it makes landfall on Florida's northwestern coast Thursday evening. As of early Thursday, hurricane warnings and flash flood warnings extended far beyond the coast up into south-central Georgia. The governors of Florida, Georgia, and the Carolinas have all declared emergencies in their states.
The National Weather Service in Tallahassee forecast storm surges of up to 20 feet (6 meters) and warned they could be particularly 鈥渃atastrophic and life-threatening鈥� in Florida's Apalachee Bay. It added that high winds and heavy rains also posed risks.
鈥淭his forecast, if realized, is a nightmare surge scenario for Apalachee Bay,鈥� the office said. 鈥淧lease, please, please take any evacuation orders seriously!鈥�
In Crawfordville, farther inland and about 25 miles (40 kilometers) northwest of Apalachee Bay, Christine Nazworth stocked up on bottled water, baked goods and premade meals at a Walmart. She said her family would be sheltering in place, despite Wakulla County issuing a mandatory evacuation order.
鈥淚鈥檓 prayed up,鈥� she said. 鈥淟ord have mercy on us. And everybody else that might be in its path.鈥�
Wakulla County was one of several to issue evacuation orders. Along Florida's Gulf Coast, school districts and multiple universities have cancelled classes.
Early Thursday, Helene was about 425 miles (680 kilometers) southwest of Tampa and moving north at 9 mph (15 kph) with top sustained winds of 85 mph (137 kph). Forecasters said it should become a major Category 3 or higher hurricane, meaning winds would top 110 mph (177 kph).
While Helene will likely weaken as it moves inland, its 鈥渇ast forward speed will allow strong, damaging winds, especially in gusts, to penetrate well inland across the southeastern United States,鈥� including in the southern Appalachian Mountains, the National Hurricane Center said. The center posted lesser tropical storm warnings as far north as North Carolina, and warned that much of the region could experience prolonged power outages, toppled trees and dangerous flooding.
Helene had swamped parts of Mexico鈥檚 Yucatan Peninsula on Wednesday, flooding streets and toppling trees as it passed offshore and brushed the resort city of Cancun.
The storm formed Tuesday in the Caribbean Sea. In Cuba, the government preventively shut off power in some communities as waves as high as 16 feet (5 meters) slammed Cortes Bay. And in the Cayman Islands, schools closed and residents pumped water from flooded homes.
Rain was already falling steadily in Atlanta on Wednesday evening as shoppers emptied shelves of water at a Kroger supermarket east of downtown. The National Weather Service in Atlanta issued flash flood warnings for much of the state.
Charles McComb said he still found it hard to believe Helene would seriously impact the city, which is more than 250 miles (400 kilometers) north of the Gulf of Mexico. 鈥淚t would be really unique for it to hit so far inland,鈥� Charles said as he bought water, bread and lunch meat.
He was, however, worried about losing electricity.
鈥淚 do live in an area where it doesn鈥檛 take so much for the power to go out,鈥� he said.
Helene is forecast to be one of the largest storms in breadth in years to hit the region, said Colorado State University hurricane researcher Phil Klotzbach. He said since 1988, only three Gulf hurricanes were bigger than Helene鈥檚 predicted size: 2017鈥檚 Irma, 2005鈥檚 Wilma and 1995鈥檚 Opal.
Areas 100 miles (160 kilometers) north of the Georgia-Florida line can expect hurricane conditions. More than half of Georgia鈥檚 public school districts and several universities canceled classes.
For Atlanta, Helene could be the worst strike on a major Southern inland city in 35 years, said University of Georgia meteorology professor Marshall Shepherd.
Landslides were possible in southern Appalachia, and rainfall was expected as far away as Tennessee, Kentucky and Indiana.
Federal authorities have positioned generators, food and water, along with search-and-rescue and power restoration teams.
Helene is the eighth named storm of the Atlantic hurricane season, which began June 1. The National Oceanic and Atmospheric Administration has predicted an above-average Atlantic hurricane season this year .
In further storm activity, Tropical Storm Isaac formed Wednesday in the Atlantic and was expected to strengthen as it moves eastward across the open ocean, possibly becoming a hurricane by the end of the week, forecasters said. Isaac was about 690 miles (1,115 kilometers) northeast of Bermuda with top sustained winds of 50 mph (85 kph), according to the U.S. National Hurricane Center in Miami, which said its swells and winds could affect parts of Bermuda and eventually the Azores by the weekend.
In the Pacific, reformed Wednesday as a tropical storm and was strengthening as it threatened areas of Mexico鈥檚 western coast. Officials posted hurricane warnings for southwestern Mexico.
John hit the country鈥檚 southern Pacific coast late Monday, killing at least two people, triggering mudslides, and damaging homes and trees. It in a matter of hours and made landfall east of Acapulco. It reemerged over the ocean after weakening inland.
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Hollingsworth reported from Mission, Kansas. Associated Press journalists Seth Borenstein in New York; Jeff Amy in Atlanta; Danica Coto in San Juan, Puerto Rico; Andrea Rodr铆guez in Havana; Mark Stevenson and Mar铆a Verza in Mexico City; Claire Rush in Portland, Oregon; and Kate Payne in Crawfordville, Florida, contributed to this report.
Heather Hollingsworth And Stephen Smith, The Associated Press
