Dorian expected to become major hurricane on Friday - U.S. NHC

Atlantic hurricane Dorian is expected to strengthen into a major hurricane on Friday, the U.S. National Hurricane Center said.

Dorian was about 150 miles (240km) north northwest of San Juan, Puerto Rico, with maximum sustained winds of 85 miles-per-hour (140kph), the Miami-based weather forecaster said on Thursday.

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