Though Hurricane Erin is not forecast to make landfall on the U.S., the storm’s rapid intensification has prompted increased measures in North Carolina.

The monster storm intensified to a Category 4 with 140 mph (225 kph) maximum sustained winds early Monday while it started to lash the Turks and Caicos Islands and the southeast Bahamas, according to the U.S. National Hurricane Center in Miami.

Forecasters are watching a new tropical system that may form behind Hurricane Erin, which is intensifying again Monday. Tropical storm and storm surge watches were issued for the North Carolina

On Monday at 5:10 p.m. the NWS Newport/Morehead City NC issued a tropical cyclone statement in effect until Tuesday at 1:15 a.m. The statement is for East Carteret, Northern Outer Banks, Ocracoke Island and Hatteras Island.

Hurricane Erin was a Category 4 storm again Monday morning and is expected to grow even larger and stronger, Life-threatening surf and rip currents are likely across the Atlantic coast from Florida to Canada.

Erin is the first hurricane to develop over the Atlantic this year, and meteorologists are closely tracking its path and forecast.