Hurricane Erin has weakened slightly into a Category 3 hurricane but is forecast to "substantially grow in size" as it moves over the western Atlantic Ocean through the week, according to the National Hurricane Center.

According to a 5 a.m. ET advisory from the hurricane center on Aug. 19 , Erin is located about 750 miles south-southeast of Cape Hatteras, North Carolina, with maximum sustained winds near 115 mph with higher gusts.

Hurricane center forecasters said Erin is moving toward the northwest, and that a turn toward the north-northwest with an increase in forward speed is expected Tuesday, Aug. 19, followed by a northward motion on Wednesday and then a northeastward motion on Thursday.

On the forecast track, the center of Erin is expected to pass to the east of the Bahamas Tue

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