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MIAMI (CBSMiami) – Tropical Depression 9 strengthened on Saturday and has now become Tropical Storm Isaac.

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At 11:00 p.m., the center of Isaac was about 1580 miles east of the Windward Islands.

Isaac is moving toward the west near 8 mph.

A westward motion with an increase in forward speed is expected during the next few days.

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Maximum sustained winds have increased to near 50 mph with higher gusts.

Additional strengthening is forecast during the next few days, and Isaac is expected to become a hurricane by Monday.

Tropical-storm-force winds extend outward up to 45 miles from the center.

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There are currently no coastal watches or warnings in effect.