Hurricane Erin has strengthened into a Category 2 storm as it approaches Puerto Rico and the Virgin Islands, bringing heavy rains that could cause flooding and landslides.

Additional strengthening is expected as the storm is forecast to “remain a large and dangerous major hurricane through the ...

While the category 4 storm is not expected to make landfall on the U.S. east coast, it will have an impact nonetheless.

Storms that ramp up so quickly complicate forecasting and make it harder for government agencies to plan for emergencies.

The storm, still driving dangerous, 125 mph winds, was centered about 310 miles northwest of San Juan, Puerto Rico, at ...

Most of Erin’s intensification occurred during a 12- to 15-hour window overnight, according to Dan Pydynowski, a meteorologist at AccuWeather. By 5 p.m. Friday, Erin’s winds had remained only 75 mph.

Hurricane Erin forced tourists to cut their vacations short on North Carolina’s Outer Banks even though the monster storm is ...