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MIAMI (CBSMiami) – Hurricane Helene is strengthening rapidly as it moves across the tropical Atlantic.

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At 11 p.m., the center of the storm was located about 535 miles west of the southernmost Cabo Verde Islands.

Helene is moving toward the west-northwest near 12 mph.

A continued west-northwestward motion with a decrease in forward speed is expected through late Tuesday, followed by a turn toward the northwest and then north-northwest on Wednesday and Thursday.

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Maximum sustained winds have increased to near 105 mph with higher gusts.

Little change in intensity is expected during the next 12 hours, but a gradual weakening trend is expected after that time.

Hurricane-force winds extend outward up to 35 miles from the center and tropical-storm-force winds  extend outward up to 115 miles.

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There are no coastal watches or warnings in effect.