Erin is a strong Category 3 hurricane, the National Hurricane Center said in its 8 p.m. ET update Sunday, with sustained winds of 125 mph and tropical storm-force winds reaching out 205 miles. The storm is just over 300 miles northwest of Puerto Rico as of Sunday evening.

While Erin is expected to take a northward turn in the Atlantic, a new system off the coast of Africa has the National Hurricane Center's attention.

Erin, which quickly strengthened into a Category 5 storm on Saturday, is not expected to make landfall in the U.S., but experts remain on alert.

An eyewall replacement cycle is underway within Hurricane Erin as the monster storm continues to barrel across the Atlantic while bringing gusty winds and rain to Puerto Rico and the Virgin Islands after rapidly intensifying into a catastrophic Category 5 hurricane over the weekend.

At the start of the storm, Hurricane Erin was gauged as high as a catastrophic Category 5 storm with a wind speed of 240 km/h but later was downgraded to Category 4 and then to Category 3.

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.It also warned of "locally considerable flash and urban flooding,

The federal government has sent more than 200 workers from FEMA and other agencies to Puerto Rico as a precautionary measure.

The storm will remain a major hurricane through the middle of the week, according to the National Hurricane Center.