Tropical Storm Debby strengthens into a hurricane: Path and tracker

Tropical Storm Debby has strengthened into a hurricane ahead of schedule.

Hurricane-force winds of 74-95 mph had been forecast in areas under a Hurricane Warning in the Big Bend region . The majority of the Florida Peninsula's west coast has been under a Tropical Storm Warning, where winds of 39-73 mph were expected.

Latest Developments

_{Aug 4, 11:17 PM}

Debby strengthens into a hurricane

The National Hurricane Center has upgraded Tropical Storm Debby to a Category 1 hurricane with winds of 75 mph.

The forecast is still on track for more strengthening overnight as Debby feeds off the warm water in the eastern Gulf of Mexico. Water temperatures running 3 to 5 degrees above average are providing plenty of fuel for this storm to intensify before landfall, which will happen around 7 a.m. ET along the Big Bend region of Florida.

-ABC News' Daniel Amarante

_{Aug 4, 9:57 PM}

Tropical Storm Debby nearing hurricane strength at 70 mph

While still a tropical storm, Debby is nearing hurricane strength, producing maximum sustained wind speeds up to 70 mph.

Debby will continue to intensify rapidly overnight as it travels northward over the Gulf's warm waters. It is forecast to become a hurricane tonight. It is expected to strengthen to at least a strong Category 1 hurricane before making landfall along Florida's Big Bend region Monday morning (around 7 a.m. ET), producing sustained wind speeds near 85 mph and wind gusts reaching over 100 mph possible.

Located about 90 miles southwest of Cedar Key, Florida, the storm continues to impact the Florida Gulf Coast with heavy rainfall, storm surge, powerful winds and even spin-up tornadoes.

A reported wind gust of 56 mph was reported in St. Petersburg, with two tornadoes reported in central Florida.

A 60-mph wind gust was also reported near Sarasota, Florida.

Numerous reports of flooding from heavy rainfall and surges have also been submitted up Florida's Gulf Coast.

The Tornado Watch covering much of northern and central Florida and southern Georgia has been extended until 6 a.m. ET on Monday.

Once Debby moves over land, it will weaken. However, the lack of a steering current will cause the storm to slow down considerably. While its exact track remains questionable, model guidance suggests the storm will drift over the Atlantic or Southeast coastline late Monday night into Tuesday before meandering back over Georgia and the Carolinas. Interaction with the Atlantic could reenergize Debby, but that will greatly depend on the storm's path.

Even though Debby's track and timing remain uncertain later this week, there is high confidence that it will bring historic rainfall and significant flooding across portions of the Southeast.

Rainfall ranging between 6 to 12 inches is possible from Florida's Big Bend region through southeastern Georgia and into the Carolinas. Parts of coastal Georgia and South Carolina will be in the bullseye for the heaviest rainfall. There, widespread totals between 10 to 20 inches are possible, with some places even seeing up to 30 inches locally. Because of this, significant urban and river flooding is anticipated.

Rainfall aside, hurricane and tropical storm force winds will continue to whip across Florida and will likely intensify Sunday night into Monday as the storm moves closer to the coast -- with areas just south and east of the storm's eyewall seeing the strongest gusts early Monday morning.

Storm surge will also worsen along Florida's northern and central Gulf coast tonight into Monday morning, with the highest surge expected between Suwannee River and Ochlockonee River (6 to 10 feet).

All tropical alerts remain unchanged from the last update.

-ABC News meteorologist Shawnie Caslin Martucci

_{Aug 4, 5:48 PM}

Tropical Storm Debby on track to become a hurricane overnight

As of 5 p.m. ET on Sunday, Tropical Storm Debby still has winds of 65 mph and is forecast to undergo rapid intensification into a hurricane overnight, according to the National Hurricane Center.

Debby is expected to make landfall as a hurricane in Florida’s Big Bend region on Monday morning around 7 a.m.

Rain is expected to be the most impactful element from this storm, affecting a wide area over an extended period of time.

"Across portions of southeast Georgia and South Carolina, 10 to 20 inches of rainfall, with local amounts to 30 inches, are expected through Friday morning," the National Hurricane Center said. "This potentially historic rainfall will likely result in areas of catastrophic flooding."

_{Aug 4, 4:14 PM}

Evacuations ordered in Alachua County, Florida, as Debby set to make landfall

An evacuation order was issued Sunday for residents of Alachua County, Florida, residing in mobile homes, manufactured homes and recreational vehicles ahead of the arrival of Debby, which is forecast to be a hurricane when it makes landfall on Monday.

People living in areas close to rivers and lakes, and low-lying areas that tend to flood in Alachua County are also encouraged to evacuate, according to a statement issued by county officials.

Gainesville is the largest city in Alachua County

"We encourage residents affected to find alternative housing with friends, family or short-term rentals," according to the county's statement.

Alachua County is opening three shelters for residents in need.

-ABC News' Bill Hutchinson

_{Aug 4, 3:24 PM}

Tornado watch issued as Debby runs parallel to Florida's Gulf Coast

A tornado watch was issued Sunday afternoon by the National Weather Service as Tropical Storm Debbie moved northward in the Gulf of Mexico parallel to Florida's Gulf Coast.

At 2 p.m. Sunday, the National Hurricane Center said Debby was still a tropical storm with winds of 65 mph and forecasted to bring severe weather, including heavy rain, to coastal communities Sunday afternoon.

A tornado watch is in effect for much of Florida through Sunday evening.

Debby is expected to become a hurricane Sunday evening and will likely make landfall sometime between 7 a.m. and 8 a.m. Monday in the Big Bend area of Florida's Panhandle.

Once Debby makes landfall, the storm is expected to slow down and essentially stall over the Southeast, dropping potentially historic amounts of rainfall as it moves into Georgia and South Carolina.

A hurricane warning is in effect for the west coast of Florida from the Ochlockonee River southwest of Tallahassee to the Suwannee River northwest of Gainesville.

-ABC News' Daniel Amarante

_{Aug 4, 1:18 PM}

More than 1,600 flights canceled due to Debby and Northeast thunderstorms

Tropical Storm Debby and thunderstorms in the Northeast were causing airlines to cancel or delay flights on Sunday.

At least 1,613 flights within, into or out of the U.S. were canceled nationwide on Sunday and another 3,213 were delayed, according to , a website that tracks flights.

American Airlines said it canceled 601 flights, or about 16% of its flights, on Sunday, the most of any airline.

Debby, now a tropical storm in the Gulf of Mexico, is expected to make landfall around the Big Bend area of the Florida Panhandle on Monday morning as a Category 1 hurricane.

Also causing delays and cancellations were severe thunderstorms moving up the East Coast. Parts of the mid-Atlantic states are under a severe thunderstorm watch until 9 p.m. ET Sunday, including the cities of Washington, D.C., Baltimore, Philadelphia, and New York City.

The most flights canceled on Sunday were at Charlotte Douglas International Airport, where 214 flights were canceled and another 172 were delayed, according to FlightAware.

In New York City, LaGuardia and John F. Kennedy international airports reported a combined 363 flights canceled and 258 delayed on Sunday.

Miami International Airport reported 209 canceled flights and 151 delayed fights. Airports in Orlando, Tampa, Philadelphia, Newark, Washington, D.C., and Dallas-Fort Worth all reported more than 100 flight cancellations on Sunday.

-ABC News' Clara Mcmichael

_{Aug 4, 12:12 PM}

10 million people under tropical storm alert on Florida's Gulf Coast

About 10 million people along Florida's west coast and up through Georgia and South and North Carolina were under a tropical storm alert Sunday as Debby took aim at the area and is forecast to make landfall in the Panhandle region on Monday.

Debby, now a tropical storm in the Gulf of Mexico about 190 miles southwest of Tampa, is expected to make landfall sometime between 7 and 8 a.m. in Big Bend on the Florida Panhandle as a Category 1 hurricane, state emergency officials said.

Debby is expected to create a storm surge of 4 to 7 feet in Cedar Key and Crystal River on the Florida west coast and a 2- to 5-foot storm surge farther south in Tampa and Sarasota.

The storm is forecast to move into the cities of Tallahassee and Jacksonville, bringing up to 20 inches of rain to some parts, before causing potential flooding in Georgia and the Carolinas on Tuesday, Wednesday and Thursday.

-ABC News' Kenton Gewecke

_{Aug 4, 11:01 AM}

National Guard put on alert for search and rescue: DeSantis

Members of the Florida National Guard have been advised to be prepared to conduct search-and-rescue missions once Tropical Storm Debby makes landfall on Monday, according to Florida Gov. Ron DeSantis.

Widespread flooding is expected for the Florida Panhandle region, particularly in the Big Bend area where Debby is expected to make landfall Monday morning as a category 1 hurricane, DeSantis said during a news conference Sunday morning.

DeSantis said the Florida National Guard and the state's Emergency Response Team are prepared to conduct search-and-rescue and provide humanitarian assistance.

"The Florida National Guard is standing by with 3,000 service members ready to assist the state Emergency Response Team, which includes search-and-rescue, route clearance, commodity distribution and protection of critical infrastructure," DeSantis said.

The governor said at least 12 swift boat crews and flat-bottom jon boat crews are also standing by to help with rescues.

He said that more than 30,000 bottles of water, more than 160,000 meals and nearly 14,000 tarps have been pre-staged in parts of Florida that are expected to be hit hard by the storm.

DeSantis said Florida utility companies have notified up to 17,000 linemen to be ready to spring into action once it is safe to repair any damage.

-ABC News Bill Hutchinson

_{Aug 4, 10:34 AM}

Flooding forecast as Debby expected to bring up to 20 inches of rain

Florida residents in the Big Bend region of the Panhandle were warned Sunday that Debby is going to bring "catastrophic rain to the area" that will cause flooding and power outages.

Kevin Guthrie, director of the Florida Division of Emergency Management, said during a news conference on Sunday that once the Debby makes landfall as a possible Category 1 hurricane on Monday morning, winds will subside quickly, but the slow-moving storm will produce an abundance of rain.

"We're going to be in a catastrophic rain situation where we have situations in Florida that will receive 15, maybe as high as 20 inches of rain," Guthrie said.

Florida Gov. Ron DeSantis told residents who are in the path of the storm to expect widespread power outages.

"It's possible that you could have serious intensification between now and landfall. It could get up to 85, 90 and 95 mph sustained winds. That is absolutely possible, particularly in parts of the state like here in Tallahassee. There's going to be a lot of trees that are going to fall down and you're going to have debris. You are going to have power interruptions," the governor said.

-ABC News' Bill Hutchinson

_{Aug 4, 10:32 AM}

Gov. DeSantis advises residents to make final preparations for Debby

Florida Gov. Ron DeSantis advised residents of the state's Panhandle region on Sunday that they should be finalizing preparations for when Tropical Storm Debby makes its anticipated landfall Monday morning as a Category 1 hurricane.

"Now this is a storm that is potentially dangerous. Residents should be finalizing all of their preparations now," DeSantis said during a news conference at the state's Emergency Operation Center in Tallahassee.

DeSantis said Tropical Storm Debby was in the Gulf of Mexico about 190 miles southwest of Tampa as of Sunday morning with sustained winds of about 50 mph.

"But those are expected to increase," DeSantis said. "Tropical Storm Debby is likely to become a Category 1 hurricane before making landfall in the Big Bend region of Florida."

He said the storm was on a similar track taken by Hurricane Idalia in 2023. Idalia made landfall in Big Bend on Aug. 30, 2023, as a Category 3 hurricane and caused a devastating storm surge of 7 to 12 feet across the coastal Big Bend region in Levy, Dixie and Taylor counties.

"This storm is a similar track," DeSantis said. "It may be a tick to the west of that. It very well may have greater impacts here in the Tallahassee region than Hurricane Idalia did. Once it crosses landfall and enters the Florida Panhandle/Big Bend Region, wherever it does, it's going to move very slowly across northern Florida and southeast Georgia."

-ABC News' Bill Hutchinson