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

Hurricane Erin has strengthened into a Category 2 storm as it approaches Puerto Rico and the Virgin Islands, bringing heavy ...

Hurricane Erin was downgraded to a Category 3 storm Sunday, but forecasters warn it is expected to intensify and grow in size ...

It quickly powered up from a tropical storm to a Category 5 in a single day, the National Hurricane Center said.

SAN JUAN, Puerto Rico (AP) — Erin strengthened into a powerful Category 4 hurricane in the Caribbean on Saturday and ...