Tropical Storm Gabrielle continues to spin in the Atlantic and is expected to strengthen into a hurricane by the end of the weekend, according to the National Hurricane Center .

The hurricane center said in a Sept. 19 advisory that Gabrielle was centered about 915 miles southeast of Bermuda with maximum sustained winds near 50 mph with higher gusts. The storm has struggled to get it together, with a partially exposed center. However, forecasters expect "gradual strengthening," and Gabrielle is forecast to become a hurricane by Sunday, Sept. 21.

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