Tropical Storm Isaac: South Florida in Isaac's 5-day error cone, National Hurricane Center says

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All of South Florida is now in the 5-day error cone for Tropical Storm Isaac.

However, it is important to remember the 5-day error cone has about a 250 mile margin of error.

The National Hurricane Center still has Isaac at 45 mph, moving west at 21 mph.

Tropical Depression #10 has formed behind Isaac, but the two storms have very different tracks.

While Isaac is headed into the Caribbean, TD #10 will curve northwest and then north out into the open Atlantic Ocean.

TD #10 could become Tropical Storm Joyce over the next couple of days, but it is not something that we need to be concerned about.

Puerto Rico, Vieques and the U.S. Virgin Islands have been placed under a hurricane watch.

Tropical storm warnings were also issued for a swath of islands across the Caribbean including Martinique, Dominica, Guadeloupe, St. Martin, St. Kitts, Nevis, Antigua, Barbuda, Montserrat, Anguilla, Saba, St. Eustatius, St. Maarten, Culebra and the British Virgin Islands.

If it impacts our weather, as it stands now it would be late Sunday or sometime Monday.

If the storm interacts with Hispaniola and Cuba, it could weaken.

Keep up with the storm's progress with the NewsChannel5 Storm Shield app .