Hurricane Erin rapidly intensifies into a Category 4. The storm is forecast to at least double or triple in size

Hurricane Erin is rapidly intensifying as it tracks above the northeastern Caribbean Saturday, churning up rough surf and sending rain and gusty winds to islands south of its path.

Erin was a Category 4 hurricane with sustained winds of 145 mph as of Saturday morning, according to the National Hurricane Center. The storm’s winds have…