Tropical Storm Gabrielle is expected to become a hurricane Sunday morning, Sept. 21, according to the National Hurricane Center.

Gabrielle is expected to become a hurricane as it passes east of Bermuda, and could strengthen into a Category 2 storm with 105-mph sustained winds within the next 36 hours.

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Forecasters warned residents in Bermuda should monitor Gabrielle's progress, especially since the National Hurricane Center's "average track error at three days is about 90 nautical miles and hazards can extend well away from the center."

Gabrielle's tropical-storm-force winds extended 140 miles from the center on Saturday.

Gabrielle is the seventh

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