Dean strengthens to 90 mph, targets Dominica, St. Lucia

As expected, Dean intensified into the season's first hurricane in the western Atlantic on Thursday morning and now poses a major threat to the central islands of the Lesser Antilles, Jamaica and Mexico's Yucatan peninsula.

The system's forecast track would take it well south of Florida, and it's unlikely that it will swing this direction, the National Hurricane Center in Miami-Dade County said.

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