"Hurricane conditions are expected to reach Bermuda by Wednesday night and continue into early Thursday morning," the Miami-based NHC said.
"Some fluctuations in intensity are likely during the next day or so, but Humberto should remain a powerful hurricane through Thursday," it said.
As of 8:00 pm (0000 GMT), the storm had maximum sustained winds of 115 miles per hour (185 kilometers per hour) and was moving east-northeast at 12 miles per hour.
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