Erin’s strength: Erin’s maximum sustained winds are 125 mph, making it a strong Category 3 hurricane. Hurricane-force winds extend 50 miles from the center. Tropical storm force winds (at least 39 mph) extend 205 miles from Erin’s center. “Some increase in size and strength is forecast during the next 48 hours,” the hurricane center said.

U.S. shores are unlikely to see a direct hit, but a strong offshore hurricane can produce massive and dangerous waves well away from its center.