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

Erin’s strong winds and heavy rain are churning up dangerous surf across the Caribbean and could impact parts of the U.S. coastline this week.

Offshore Hurricane Erin was downgraded to a Category 3 storm early Sunday, as rain lashed Caribbean islands and weather officials warned of possible flash floods and landslides.