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Preparations

墨西哥

Tropical storm warnings were issued on September 24 for the eastern Yucatán Peninsula. Parts of Quintana Roo and Yucatán were placed under a blue alert, indicating indirect impacts. It was later raised to red alert, maximum danger. Cruise ship arrivals in the former state's ports were canceled for September 24 and 25. Tren Maya was also closed. On Isla Mujeres, two shelters were opened. Evacuations were carried out in vulnerable areas. Visitors of Isla Holbox were offered a ferry ride off the island with no cost. Classes were suspended in Quintana Roo.

加勒比海地区

Cayman Islands

The Cayman Islands were placed under a tropical storm warning on September 24. The Cayman Islands' Red Cross shelter opened in preparation for the storm; nobody used it. Sandbagging sites opened on Grand Cayman and Cayman Brac. Due to the threat of heavy rainfall, schools in the Cayman Islands were closed on September 23. Charles Kirkconnell International Airport and Owen Roberts International Airport were closed ahead of Helene's arrival. The Cayman Islands Regiment was deployed ahead of the system to help with preparation and distribute sandbags. Additionally, a small craft warning was issued for the islands on September 23, with a marine advisory issued the next day. The tropical storm warning was canceled the next day.

古巴

Tropical storm warnings and hurricane watches were issued for western Cuba. Medical brigades were prepared for flood-prone areas; as heavy rain began to fall, schools and ports were closed, and fishing boats were called in. Due to adverse weather conditions caused by Helene, the Provincial Transport Company of Havana suspended ferry services in Regla. Additionally, the Maritime Administration of Cuba suspended navigation in the Gulf of Batabanó.

美国

Amtrak modified or canceled several of its southeastern train routes between September 27 — October 1 because of the storm.

佛罗里达州

Embry–Riddle Aeronautical University in Daytona Beach, Florida sheltering part of its Cessna 172 fleet in a purpose-built parking garage in preparation for Hurricane Helene

Hurricane warnings were issued for the Big Bend area of Florida, with nearly all of Florida, except the westernmost part of the Florida panhandle, put under a tropical storm warning. In addition, on the evening of September 26, an extreme wind warning was issued for the east part of the Florida Panhandle, the first since Hurricane Idalia. On September 23, Governor Ron DeSantis issued a state of emergency for 41 Florida counties. The next day, this was expanded to 61 counties. U.S. President Joe Biden authorized a federal disaster declaration for 61 counties across Florida. Locally, Volusia County issued a state of emergency. Several sandbagging sites opened up across the state. On September 24, several state parks were closed: four of them in Franklin County, two in Gulf County, and one in Gadsen County.

In the Tampa Bay area, officials announced that schools would be closed ahead of the storm. A college football game between Florida A&M University and Alabama A&M University, which was scheduled for the weekend of September 28–29, was postponed until November 29 due to the storm. At Florida State College at Jacksonville, classes and activities at the campus were canceled for two days. The SpaceX Crew-9 mission, which would have launched from the Cape Canaveral Space Force Station on September 26, was delayed to September 28 due to the storm. The Central Florida Zoo and Botanical Gardens planned to close on September 26 and canceled events on that date. Mickey's Not-So-Scary Halloween Party was canceled for Helene. Halloween Horror Nights was also cancelled. The universities of Central Florida, Embry–Riddle Aeronautical, Florida, Florida A&M, Florida Atlantic, Florida Gulf Coast, Florida State, Keiser, Lynn, North Florida, South Florida, and Stetson announced closures of their campuses and suspended academic operations. Leon County opened up schools to be used as shelters.

On September 24, Citrus County issues mandatory evacuations for zone A, which includes coastal areas in the communities of Crystal River and Homosassa. In Wakulla County, a mandatory evacuation for all residents and visitors, while in ​Hernando County, mandatory evacuations were ordered for anyone west of US 19 and all residents in coastal or low-lying areas and those living in manufactured homes. Two prisons in Wakulla County holding a combined 2,500 inmates were not evacuated despite the evacuation order issued to residents. Gulf County issued mandatory evacuations for all visitors. Elsewhere, in Charlotte County and Franklin County, mandatory evacuations were issued for barrier islands, low-lying and flood-prone areas, manufactured homes, and homes that did not meet building codes. In Sarasota County, officials issued an evacuation order for Level A and manufactured home communities on September 25.

Busch Gardens Tampa Bay, St. Pete–Clearwater International Airport, and Tampa International Airport were closed on September 26. Further north, Tallahassee International Airport was closed the same day.

佐治亚州

Georgia National Guard preparing for hurricane

The coast of Georgia was placed under tropical storm warnings while Southwest Georgia was placed under a hurricane warning which extended as far north into the state as Spalding County, Georgia and all tropical storm watches in Georgia were replaced with tropical storm warnings as far north as the Tennessee and Georgia state border. The National Weather Service in Peachtree City accidentally issued a hurricane warning for Jackson County, Georgia, when it was supposed to be a tropical storm warning.

In addition, on the night of September 26, an extreme wind warning was issued for portions of South Georgia, including Valdosta. On September 24, in preparation for Helene, officials in the counties of Bryan, Candler, and Chatham began mobilizing emergency response centers. Colquitt, Thomas, and Decatur counties opened shelters. That same day, Governor Brian Kemp issued a state of emergency for Georgia since Helene was expected to track into the state. In Thomas County, the Public Works Department began providing sandbags due to the storm.

On September 25, schools were closed in the counties of Bibb and Twiggs. Many schools in the Atlanta metro area cancelled instruction for September 26 and 27, such as Atlanta Public Schools, with some counties moving students and non-essential workers online. Elsewhere, in Clayton County schools, indoor and outdoor athletic events were canceled. The Cumberland Island National Seashore and Fort Pulaski National Monument closed on September 25 in preparation for the hurricane. The Atlanta Braves postponed the remaining two games in a series against the New York Mets to September 30 in a doubleheader. Curfews were implemented by several localities on September 26. Emory University moved classes online for September 26 and 27. Ahead of the storm, vice-presidential nominee JD Vance canceled two events on September 26 for the 2024 Trump–Vance campaign scheduled in Macon and Flowery Branch.

On September 27, Delta Airlines at Hartsfield-Jackson Atlanta International Airport issued travel waivers to people impacted by flight cancellations or delays. They also anticipated that there would be travel disruptions due to the force of Hurricane Helene making it dangerous for airplanes to fly. There were 171 flight cancellations to and from Hartsfield-Jackson Atlanta International Airport with most being from Charlotte Douglas International Airport and Augusta Regional Airport. There were 489 flight delays with most of those flight delays from Tampa International Airport, Augusta Regional Airport and Jacksonville International Airport. These cancellations and delays included Delta Airlines, Frontier Airlines, Spirit Airlines, Westjet Airlines, and many other airlines.

南卡罗莱纳洲

The entirety of South Carolina was placed under tropical storm warning. Governor Henry McMaster issued a state of emergency for South Carolina. Congaree National Park was closed September 26 through September 27 due to the hurricane.

北卡罗来纳洲

Western North Carolina was placed under tropical storm warnings. Governor Roy Cooper declared a state of emergency for North Carolina. Both Gorges State Park and Mount Mitchell State Park were closed due to the storm, with a shutdown also occurring on the Blue Ridge Parkway.

Elsewhere

Some parts of Indiana and Ohio were placed under high wind warning or wind advisory alerts, as a result of remnants of the hurricane producing wind speeds of at least 10—35 mph（16—56 km/h） as well as wind gusts up to 50 mph（80 km/h）.

In Alabama, Henry and Houston Counties were placed under a hurricane warning. Several eastern counties were also placed under tropical storm warning. Several school districts in Alabama either canceled school or released early in preparation for Helene. A state of emergency was approved for the state by Joe Biden. In Louisville, Kentucky, a music festival, Louder Than Life, canceled their Friday shows due to strong winds.

In Virginia, Governor Glenn Youngkin issued a state of emergency. Virginia Task Force 1 along with Maryland Task Force 1 were deployed to Hurricane Helene.