Tropical Storm Danny formed Wednesday on a path that could threaten North Carolina and the Eastern Seaboard by Saturday.
At 11 a.m., the National Hurricane Center said the system had grown powerful enough to become the season's fourth named storm, with winds topping 45 mph.
Danny, moving northwest at 18 mph, was just over 600 miles east of Miami and within 450 miles of Nassau. On its predicted track northwest, Danny would pose no risk to Florida. Forecasters said the storm's outer bands could bring up to four inches of rain to the northwestern Bahamas and about half that to islands to the south.
The hurricane center's computer models predicted Danny would begin to turn more to the north, moving between two atmospheric troughs. That center's three-day cone of possibility has the storm paralleling the Eastern Seaboard but forecasters cautioned there was a wide margin of error that could take the storm's core over land or steer it offshore.
Depending on the track, the coastline from North Carolina to New England could see impacts.
Though wind shear and other conditions could make it difficult for Danny, forecasters expected the storm to slowly strengthen, potentially to hurricane status as it moves north over the next few days.
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