Forecasters cast a wary eye on Tropical Storm Isaac, which was moving west in the Atlantic Ocean and poses a potential threat to Florida during next week's Republican National Convention in Tampa.
It's much too early to say whether it will make a beeline for Tampa, on Florida's west coast. But it's the type of weather that convention organizers knew was a possibility during the peak of hurricane season — and they have backup plans in place in a worst-case scenario.
It's been 90 years since a major hurricane made a direct hit on Tampa. The last to strike Florida's west coast was Hurricane Charley, a Category 4 packing 150 mph winds. The Aug. 13, 2004, storm was small yet powerful — and was initially forecast to strike the Tampa Bay area before it turned and slammed Port Charlotte, about 100 miles south.
National Hurricane Center computer models predicted Isaac would become a hurricane by the weekend, meaning maximum winds must be at least 74 mph.
Jeff Masters, director of meteorology at Weatherunderground.com, said long-range storm track predictions five days in advance are notoriously inaccurate, often off an average of 260 miles. But Masters said the climate situation has raised the chance that Florida could be in the system's sights during the GOP event, which runs Monday through Thursday.
"It would take a perfect storm of a scenario where a bunch of factors all conspire together," Masters said. "But we definitely have to watch this one."
Thursday morning, forecasters said Isaac would move on to Cuba as a tropical storm, then perhaps head by Monday to Florida. The storm was 225 miles south-southeast of San Juan, Puerto Rico, with maximum sustained wind near 40 mph. Isaac was moving west near 13 mph, according to the National Hurricane Center.
GOP and state officials have contingency plans in place if the storm makes its way to Tampa, including an evacuation in a worst-case scenario. About 70,000 delegates, party officials, journalists, protesters and others are expected for the convention, which culminates in the nomination of former Massachusetts Gov. Mitt Romney for president and Wisconsin U.S. Rep. Paul Ryan for vice president.
"We're monitoring it," said James Davis, communications director for the Republican National Convention. "We're in close touch with all the federal, state and local agencies. We're focused on preparing still and having a great event starting on Monday."
A four-day mock hurricane drill was held in May featuring a pretend major storm striking the Tampa area during the second day of the convention. Under that scenario, planners canceled the convention. A major hurricane is a Category 3 or above with winds at least 111 mph and devastating damage can occur.
"At this point, we're prepared for everything," Tampa Police Chief Jane Castor said Tuesday. "We've certainly factored that into our plans."
Forecasters say that fortunately for Tampa, most Gulf storms emerge earlier or later in the hurricane season, which runs from June 1 to Nov. 30.
Florida, historically the nation's top target for tropical systems, has not been hit by a major hurricane since Wilma in 2005. The new storm's potential threat comes just as South Floridians are marking the 20th anniversary of Hurricane Andrew, a Category 5 monster that resulted in 26 direct deaths and caused some $26.5 billion in damage when it came ashore south of Miami on Aug. 24, 1992.