Hurricane Dorian is expected to suck powerful fuel from the warm waters off the Florida coast, swelling into a dangerous Category 4 storm in the coming days before it slams into the state early next week, forecasts showed on Friday.

The Miami-based National Hurricane Center issued a hurricane watch for northwestern Bahamas on Friday and said the risk of “devastating hurricane-force winds along the Florida east coast late this weekend and early next week continues to increase.”

The storm began Friday over the Atlantic at Category 2 but was already expected to reach Category 3 later in the day, with sustained winds of at least 111 mpg (178km/h).

Late Thursday, CoreLogic, a property information and analytics firm, released data showing the total reconstruction cost value of homes at risk for storm surge damage from Hurricane Dorian. Total RCVs ranged from $24.2 billion for a Category 1 storm to $271.9 billion for a Cat 5.

At the currently forecast Category 4 level, more than 970,000 single-family and multifamily homes are estimated to be at risk, with a total RCV just over $200 billion—60 percent of that coming centered on the Miami-Fort Lauderdale-West Palm Beach, Fla. Area.

At the time CoreLogic released its figures, a Category 3 status seemed likely, and CoreLogic noted that more than 668,000 residences were at risk with an RCV of roughly $144.6 billion.

The entire state of Florida is under a declaration of emergency and Governor Ron DeSantis activated 2,500 National Guard troops with another 1,500 on standby.

Forecasters predict the storm growing more ferocious as it slows its advance across the warm waters near the coast, striking land late on Monday or early Tuesday. Tropical storm winds could be felt in Florida as soon as Saturday evening.

No evacuations were ordered as of early Friday, but many are expected as the storm’s path become clearer before it makes landfall.

If, as expected, it reaches Category 4 by Sunday, its winds will blow at more than 130 mph. Its 12 mph (9 kph) march across the map could slow down to a 4 mph crawl. The slower it moves, the more time it has to draw fuel from the warm seas.

Recent weather models from the National Hurricane Center show it smacking into the center of the state. It was trending slightly south in the latest advisory issued at 5 a.m. Friday.

It could roll inland towards Orlando on Tuesday or early Wednesday, weakening as it moves away from the sea. Other NHC weather models show it tracking south toward Miami before it hits the peninsula, or heading north to the Georgia coast.

Along with the dangerous winds, the storm is expected to drop 5-to-10 inches of rain on the state, with some areas getting as much as 15 inches.

“This rainfall may cause life-threatening flash floods,” NHC forecasters said.

President Donald Trump canceled a planned trip to Poland, sending Vice President Mike Pence in his place, so he can make sure resources are properly directed for the storm.

“Now it’s looking like it could be an absolute monster,” Trump said in a video posted on Twitter, adding that food and water was being shipped to Florida.

DeSantis said that Floridians need to take the storm seriously.

“Hurricane #Dorian is moving slowly & gaining strength,” DeSantis wrote on Twitter. “Now is the time to get prepared & have a plan.”

Georgia Governor Brian Kemp declared a state of emergency in 12 counties to assist with storm readiness, response and recovery.

‘Not Looking Good’

Angela Johnson, a 39-year-old bar manager in South Florida, said on Thursday: “We’re worried. This is not looking good for us.”

“We woke up a lot more scared than we went to bed last night, and the news is not getting any better,” said Johnson, who manages Coconuts On The Beach, a bar and restaurant on the surfing beach in the town of Cocoa Beach.

Officials were making piles of sand available for Cocoa Beach residents to fill sandbags starting on Friday.

Dorian could churn across dozens of launchpads owned by NASA, the U.S. Air Force and companies such as Elon Musk’s SpaceX and Jeff Bezos’ Blue Origin. (Reporting by Zach Fagenson in Miami and Rich McKay in Atlanta; additional reporting by Gabriella Borter, Andrew Hay, Helen Coster in New York, Alexandra Alper, Joey Roulette and Eric Beech in Washington.)