Hurricane Wilma strengthened into a Category 5 monster early Wednesday packing 175 mph winds, and forecasters said a key reading of the storm's pressure showed it to be the most powerful of the year.
Wilma was dumping rain on Central America and Mexico, and forecasters warned of a "significant threat" to Florida by the weekend.
The storm's power multiplied greatly over the last day. It was only Tuesday morning that Wilma grew from a tropical storm into a weak hurricane with 80 mph winds.
Wilma's pressure readings Wednesday morning indicated that it was the strongest hurricane of the season, said Trisha Wallace, a meteorologist at the National Hurricane Center in Miami. Wilma had a reading of 892 millibars, the same reading as a devastating unnamed hurricane that hit the Florida Keys in 1935.
"We do not know how long it will maintain this Category 5 state," Wallace said.
Jamaica, Cuba, Nicaragua and Honduras were getting heavy rain from the storm, though it wasn't likely to make landfall in any of those countries, she said. Forecasts showed it would likely turn toward the narrow Yucatan Channel between Cuba and Mexico's Cancun region — then move into the storm-weary Gulf.
By 2 a.m. EDT, the hurricane was centered about 170 miles southwest of Grand Cayman Island and about 400 miles southeast of Cozumel, Mexico. It was moving toward the west-northwest at nearly 8 mph, according to the Hurricane Center.
"It does look like it poses a significant threat to Florida by the weekend. Of course, these are four- and five-day forecasts, so things can change," said Dan Brown, a meteorologist at the National Hurricane Center.
Wilma already had been blamed for one death in Jamaica as a tropical depression Sunday. It has flooded several low-lying communities and triggered mudslides that blocked roads and damaged several homes, said Barbara Carby, head of Jamaica's emergency management office. She said that some 250 people were in shelters throughout the island.
While some Florida residents started preparing by buying water, canned food and other supplies, hurricane shutters hadn't gone up yet in Punta Gorda, on Florida's Gulf coast, and no long lines had formed for supplies or gas.
Still, Wilma's track could take it near that city and other Florida areas hit by Hurricane Charley, a Category 4 storm, in August 2004. The state has seen seven hurricanes hit or pass close by since then, causing more than 20 billion US dollar in estimated damage and killing nearly 150 people.
The storm is the record-tying 12th hurricane of the season, the same number reached in 1969; 12 is the most in one season since record-keeping began in 1851.
On Monday, Wilma became the Atlantic hurricane season's 21st named storm, tying the record set in 1933 and exhausting the list of names for this year.
The deadly season has already witnessed the devastation of Katrina and Rita in the past two months, which killed more than 1,200 people and caused billions of dollars in damage.
The government of flood-prone Honduras warned that Hurricane Wilma posed "an imminent threat to life and property of the people of the Atlantic coast." Neighboring Nicaragua also declared an alert.
PHOTO CAPTION
This NOAA satellite image taken Wednesday, Oct. 19, 2005, at 2:15 a.m. EDT shows thick clouds associated with Hurricane Wilma centered west-southwest of Jamaica. (AP)