KINGSTON, Jamaica?Hurricane Iris strengthened into the Atlantic?s most powerful hurricane of the year as it advanced across the Caribbean toward Central America Monday, bringing winds of up to 140 mph.

The storm brushed past Jamaica on Sunday with 85 mph winds that toppled some trees, tore off roofs and left at least one person injured. Three people were killed on Saturday when the hurricane passed through the Dominican Republic.

The hurricane?s winds strengthened dramatically as the storm moved over open water. Hurricane conditions were expected in Belize, Guatemala and northern Honduras on Monday night.

?This is going to cause extensive damage wherever it makes landfall,? said Richard Knabb, a meteorologist at the U.S. National Hurricane Center in Miami.