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MIAMI (CBSMiami) – Claudette, the third storm of the 2015 hurricane season, has formed in the Atlantic.

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Tropical storm Claudette formed well east of the United States mid-Atlantic coast Monday afternoon. The storm is not expected to threaten the U.S.

Tropical Storm Claudette’s maximum sustained winds are near 50 mph.

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As of 1 PM Monday, Claudette is about 290 miles south-southeast of Nantucket, Massachusetts and  about 550 miles south-southwest of Halifax, Nova Scotia.

Claudette is moving toward the northeast near 15 mph and is expected to pick up forward speed during the next couple of days.

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The tropical storm is expected to weaken by Tuesday morning and become a post-tropical cyclone by Tuesday night.