SAN PEDRO SULA, Honduras -- The fringes of Hurricane Wilma lashed Caribbean nations on Wednesday, forcing schools to close and thousands to evacuate as it churned toward Mexico's Cancun resort and Florida after killing at least 12 people and becoming the most intense storm ever to form in the Atlantic.
The National Hurricane Center in Miami warned that Wilma would be a "significant threat" to Florida by the weekend in a season that has already seen devastation from Hurricanes Katrina and Rita. Officials ordered tourists out of the Florida Keys.
"We had well over 1,000 lives lost in Katrina. If Wilma, you know, comes into the U.S., to the Florida coast as a Category 3 or 4 hurricane, that potential for large loss of life is with us," said hurricane center director Max Mayfield.
The White House, stung by criticism that it had not responded quickly enough to Katrina, promised to stay on top of the situation. "We are closely monitoring what is an extremely
dangerous storm," said White House spokesman Scott McClellan. "People should take this hurricane very seriously."
Tourists packed Cancun's airport in hopes of catching flights out and MTV postponed its Video Music Awards Latin America ceremony, originally scheduled for Thursday at a seaside park south of the resort town.
Floridians braced for the storm by boarding up windows and stocking up on supplies, although forecasters at the hurricane center said the forward motion of the Category 5 storm appeared to be slowing, which could cause it to eventually weaken.
Mayfield said Wilma may not reach the Florida Keys until Saturday, possibly toward the evening. It had earlier been expected to reach the Florida mainland Saturday. It was still a Category 5 storm with 160 mph winds, down from 175 mph earlier in the day.
Heavy rain from Wilma's outer bands also forced evacuations in Honduras, Cuba, Jamaica and Haiti -- even as much of Central America and southern Mexico was still recovering from Hurricane Stan, which left more than 1,500 people dead or missing.
Wilma was on a curving course that would carry it through the narrow channel between Cuba and Mexico on Friday, possibly within a few miles of Cancun and Cozumel.
At 5 p.m. EDT, Wilma was centered about 285 miles southeast of Mexico's Cozumel island and about 465 miles south-southwest of Key West. It was moving west-northwest near 7 mph.
Wilma's confirmed pressure readings early Wednesday dropped to 882 millibars, the lowest minimum pressure ever measured in a hurricane in the Americas, but it later lost power and rose to 900 millibars, according to the hurricane center. Lower pressure translates into higher wind speed.
The strongest Atlantic storm on record, based on pressure readings, had been Hurricane Gilbert in 1988, which registered 888 millibars.
With heavy rain, high winds, and rough seas already pounding coastal areas, flood-prone Honduras warned that Wilma posed "an imminent threat to life and property." The country closed two Caribbean ports.
The closest land to Wilma's eye were the nearly uninhabited Swan Islands, once used by the CIA for propaganda broadcasts to Cuba. They were 35 miles west of the storm's center.
The head of Haiti's civil protection agency, Maria Alta Jean-Baptiste, said rains associated with Wilma caused floods and landslides that killed at least 11 people since Monday. At least 2,000 families were forced from flooded homes.
Jean--Baptiste later said she received unconfirmed reports that two more people drowned Wednesday while trying to cross a river that overflowed its banks in the southern town of Les Anglais.
Cuban authorities suspended classes in the western province of Pinar del Rio and prepared to evacuate tourists from campgrounds and low-lying areas, according to Granma, the Communist daily. More than 1,000 people were evacuated in the island's eastern Granma province.
Jamaica, where heavy rain has fallen since Sunday, closed almost all schools and 350 people were living in shelters. One man died Sunday in a rain-swollen river.
A military helicopter plucked 19 people from rooftops Tuesday in St. Catherine parish, where some areas were flooded with up to 7 feet of water, said Barbara Carby, head of Jamaica's emergency management office.
"The problem is that with the level of saturation, it doesn't take much more rain for flooding to occur, so we still have to remain very much on alert," she said.
Prime Minister P.J. Patterson ordered the military to make emergency food shipments to stranded residents.