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

After exploding in strength at a historic rate this weekend, Hurricane Erin is now a sprawling Category 4 storm churning in the Atlantic. The storm’s enormous footprint is becoming the biggest concern as it threatens to drive life-threatening rip currents and towering waves toward the eastern US coastline and Bermuda.

Hurricane Erin was a Category 4 storm again Monday morning and is expected to grow even larger and stronger, according to the latest advisory from the National Hurricane Center. Although Erin is forecast to move north between the U.S. and Bermuda, life-threatening surf and rip currents are likely across the Atlantic coast from Florida to Canada.

This threat will steadily increase Tuesday through Thursday night, gradually decreasing heading into the weekend, forecasters said.

Hurricane Erin is forecast to continue growing in size, with hurricane-force winds extending up to 50 miles from its center.

Nearly 155,000 utility customers are without power in Puerto Rico as Category 3 Hurricane Erin batters the Caribbean, bringing heavy rainfall and gusty winds to Puerto Rico and the Virgin Islands.“The adverse weather has caused multiple interruptions across the island,