Hurricane Erin, now classified as a major hurricane, is under close observation by Hurricane Hunters. The storm’s wind field has grown to about 400 miles with tropical storm-force winds.

Hurricane Erin is a sprawling Category 4 storm churning in the Atlantic Monday after exploding in strength at a historic rate this weekend. The storm’s enormous footprint is becoming the biggest concern as it brings heavy rain and gusty winds to islands far from its center and threatens to drive life-threatening rip currents and towering waves toward the eastern US coastline and Bermuda,

Hurricane Erin remains a Category 4 storm, forecast to bring life-threatening surf and rip currents across the U.S.