Tropical Storm Isaac continues to move west Wednesday morning, and is expected to reach hurricane strength. Meanwhile, Tropical Depression #10 formed in the eastern Atlantic.
In the 11 a.m. advisory Wednesday, Isaac had sustained winds of 45 mph and was moving west at 21 mph. The center was about 140 miles east of Guadeloupe.
South Florida remains in the cone of probability.
A hurricane watch is in effect for Puerto Rico, Vieques, Culebra and the U.S. Virgin Islands. A hurricane watch was issued for the British Virgin Islands.
Tropical storm warnings are in effect for Martinique Guadeloupe and the surrounding islands, St. Martin, St. Kitts, Nevis, Antigua, Barbuda, Montserrat, Anguilla Saba, St. Eustatius, St. Maarten, the British Virgin Islands, and parts of Puerto Rico, Vieques, Culebra and the U.S. Virgin Islands.
A tropical storm watch is in effect for the north coast of the Dominican Republic from the Haiti-Dominican Republic northern border eastward to north of Isla Saona.
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Long range models show the storm will move into the Caribbean on Thursday morning, before heading for the southern side of Hispaniola and Cuba. The storm could potentially turn north and threaten South Florida early next week. Additional strengthening is forecast during the next 48 hours.
Meanwhile, a tropical wave near the Cape Verde Islands now has a near 100 percent chance of development. According to the National Hurricane Center, satellite imagery indicates the system could become a tropical cyclone within the next 48 hours.
As Isaac approaches South Florida, read what Hurricane Specialist Max Mayfield suggests residents do to prepare.