Rita Strengthens To Tropical Storm

(CBS/AP)  Thousands of tourists jammed the highways Sunday after they were told to evacuate the lower Florida Keys because Tropical Storm Rita developed over the Bahamas and moved toward the vulnerable, low-lying island chain.

A hurricane watch was posted for the entire Florida Keys, which means hurricane conditions of winds of at least 74 mph are possible by late Monday.

In Tallahassee, Gov. Jeb Bush declared a state of emergency for Florida, which gives the state authority to oversee evacuations and activate the National Guard, among other powers.

"It does look like that there is the potential for it to become a hurricane, near or just before it reaches the Florida Keys," said Daniel Brown, a meteorologist at the National Hurricane Center.

"This is gaining strength rapidly, moving at about 10 miles per hour, reports CBS News Early Show weatherman Dave Price. "Overnight Monday, into Tuesday, it becomes a hurricane, with about 50 to 100 mph winds through the Keys and five- to nine-foot surges."

Long-term forecasts show the system heading generally toward the west in the Gulf of Mexico toward Texas or Mexico later in the week, but such forecasts are subject to large errors. That means that areas ravaged by Hurricane Katrina could potentially be in the storm's path.

"Once it reaches the Gulf, really everybody should pay attention at that point," Brown said.

Rita is the 17th named storm of the Atlantic hurricane season. That makes this season the fourth busiest since record keeping began in 1851 — 21 tropical storms formed in 1933, 19 developed in 1995 and 1887 and 18 formed in 1969, according to the hurricane center.

At 5 p.m. EDT, Rita had top sustained winds of about 40 mph, just above the 39 mph threshold for a tropical storm. It was centered about 355 miles east-southeast of Nassau, Bahamas, and about 600 miles east-southeast of Key West. It was moving to the west near 10 mph.

Monroe County emergency management officials told visitors to leave islands extending from the Dry Tortugas west of Key West to the Seven Mile Bridge near Marathon. The islands are connected to each other and the mainland by a single highway.

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