Tropical Storm Helene forms, expected to become major hurricane as it approaches Florida

Tropical Storm Helene formed over the northwestern Caribbean Sea Tuesday morning and was expected to strengthen into a major hurricane as it it moved through the Gulf of Mexico on a path toward Florida.

Helene had maximum sustained winds of 45 mph and was about 180 miles east-southeast of Cozumel, Mexico, according to the latest update from the National Hurricane Center in Miami.

Once it moves closer to the Yucatan channel, it’ll have the opportunity to strengthen into a hurricane and then a major hurricane, the NHC said.

The forecast currently has Helene getting up to a major Category 3 hurricane as it approaches landfall by Thursday afternoon and evening in the Big Bend of Florida. Hurricane watches were in effect for those areas. 

A tropical storm warning was issued for the Lower Florida Keys west of the Seven Mile Bridge, and for the Dry Tortugas. A tropical storm watch was issued for the Middle Florida Keys from the Seven Mile Bridge to the Channel 5 Bridge.

Storm surge watches stretched along the state's Gulf coast from the Big Bend all the way to the Florida Keys.

Florida Gov. Ron DeSantis expanded a state of emergency to 61counties ahead of the storm.

Tropical storm force wind is expected to extend well away from the center of the storm. South Florida's wind begins picking up tonight and into Wednesday morning. TS force conditions in the Lower Keys could last into Thursday! @nbc6 pic.twitter.com/Qzm5lWpGVy

— Chelsea Ambriz (@ChelseaAmbrizTV) September 24, 2024

Major impacts

Heavy rainfall will come with this system, increasing the flooding threat. The flooding rain looks to track well inland and into the midsouth into the weekend.

Due to how large this system is forecast to be, storm surge, wind and rainfall impacts will extend well away from the center, especially on the east side of the system.

Hurricane watches are place through the Big Bend of Florida while tropical storm watches extend down into the Lower Keys.

This system is forecast to strengthen into a major hurricane before making a landfall on Thursday! @nbc6 pic.twitter.com/tqsImqd1iW

— Chelsea Ambriz (@ChelseaAmbrizTV) September 24, 2024

Timeline

Wind will begin to pick up Tuesday afternoon and evening across the South Florida area.

Outer rain bands from this system could start to move through the overnight hours on Tuesday and into Wednesday morning. Surge in the Florida Keys could be 1-3 feet as the system passes.

For South Florida, wind will be the main thing we feel across Broward and Miami-Dade counties. Gusty conditions take over Wednesday, Thursday and Friday. Wind could be sustained 20-25 mph and gust 35-40+ mph. 

Scattered tropical downpours are expected starting overnight Tuesday and into Wednesday morning.

The scattered outer bands will last off and on into Thursday and lingering showers into Friday. Isolated and quick tornadoes can’t be ruled out. Rain totals should be 2-4 inches with localized areas seeing up to 6 inches.

In the Keys, winds are already starting to pick up and will continue to do so through Thursday. Sustained wind of 20-30 mph is expected with gusts of 50+ mph.

Rainfall totals will range from 4-6 inches, especially as we go into Wednesday, and this system is west of the island chain.

Rain looks to linger into the weekend. Storm surge will also be possible, with heights of 1-3 feet.