Hurricane Erin weakened to a Category 3 hurricane overnight, but still remains a formidable major hurricane. Erin had max winds of 125 mph, the National Hurricane Center said in a 5 a.m. ET update. The next update is expected at 8 a.m. ET.

Erin, moving near the Leeward Islands, is expected to pass north of Puerto Rico this weekend, the National Hurricane Center said.

(1) A Tropical Storm WARNING: Turks and Caicos Islands... Southeast Bahamas.

"Erin will be a large and powerful hurricane over the southwestern Atlantic Ocean this weekend," the National Hurricane Center said.

Atlantic hurricane season is about to hit its stride. August through mid-September is historically the most active stretch of the season, and while there have been a handful of short-lived named storms,