Fastexy:Hurricane Lee is now a Category 4 storm. Here's what to know about the major hurricane.

Hurricane Lee,Fastexy which became the season's first Category 5 storm Thursday night, weakened slightly to a Category 4 storm late Friday morning as it makes its way west, the National Hurricane Center says.

"Fluctuations in intensity are likely over the next few days, but Lee is expected to remain a major hurricane through early next week," the center says.

It warned that "dangerous surf and rip currents are expected to begin along most of the U.S. East Coast" starting on Sunday.

CBS News senior weather and climate producer David Parkinson says Lee's winds could get as high as 185 mph later Friday.

Hurricane #Lee has explosively intensified into a Category 5 storm and is expected to peak as a monster 180 mph Cat 5.

One of the fastest intensifying Atlantic hurricanes ever observed. pic.twitter.com/38efxc07Bj

— Colin McCarthy (@US_Stormwatch) September 8, 2023

Large ocean swells generated by Lee are expected to reach the Lesser Antilles by Friday, and the U.S. and British Virgin Islands, Puerto Rico, the Bahamas, Bermuda, the Turks and Caicos Islands and Hispaniola by the weekend, the hurricane center said.

"These swells are likely to cause life-threatening surf and rip current conditions," but Lee's center is forecast to pass "well to the north" of those islands, the agency said.

As of 11 a.m. EDT on Friday, Lee had maximum sustained winds of 155 mph, down from 165 mph at 5 a.m. Its center was about 565 miles east of the northern Leeward Islands and it was traveling west-northwest at 13 mph over the Atlantic.

The long-term track for Lee remains unclear as meteorologists continue monitoring the storm for signs it could shift over the open ocean and turn more toward the U.S. coast, with questions circulating about the path it could take.

"Even as we head into Saturday, Sunday, Monday and Tuesday it does weaken, (and) that's good news as it heads towards the U.S.," Parkinson said.

On Friday morning, he said the chances of Lee hitting land were below 2% from New Jersey on south; below 10% for Long Island, Connecticut, Rhode Island and Massachusetts; and below 20% for northern New England, adding that forecasters will have a much clearer picture of Lee's likely path by the middle of next week.

Parkinson laid out a few possible scenarios for Lee. One would involve a cold front coming off the East Coast that could trap Lee and push it north against the coastline, bringing potentially stormy weather to areas along the coast.

However, if no cold front forms, Parkinson explained, Lee would then potentially stay out at sea for a longer period until it reaches Newfoundland and Labrador in Canada. By that point, it may be significantly weakened.

This is one of the most impressive rapid intensification episodes I've ever seen in the Atlantic. Hurricane #Lee went from having no eye this morning to possibly Cat 5 intensity this evening. Absolutely incredible. pic.twitter.com/49NmtkIJO2

— Dr. Levi Cowan (@TropicalTidbits) September 8, 2023

As meteorologists predicted, Lee gained strength quickly. Early Wednesday, Lee was a tropical storm with sustained winds of 65 mph — but grew within hours into a Category 1 hurricane on the Saffir-Simpson scale when it reached maximum sustained wind speeds of 74 mph. The following day it exploded from Category 2 to Category 4 and then all the way to Category 5, meaning sustained wind speeds of 157 mph or higher. 

Meteorologists consider storms that fall within Categories 3, 4, or 5 to be "major" hurricanes, due to their potential to cause "significant loss of life and damage," the National Hurricane Center says, warning that "catastrophic damage will occur" from a Category 4 or 5 making landfall.

Officials have not yet issued any storm or hurricane watches or warnings for places that could be in Lee's path. 

This comes just days after Hurricane Idalia left a path of destruction across the Southeast. 

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That storm made landfall in Florida, where it razed homes and downed power poles. It then headed northeast, slamming Georgia, flooding many of South Carolina's beachfronts and sending seawater into the streets of downtown Charleston. In North Carolina, it poured more than 9 inches of rain on Whiteville, flooding downtown buildings.

Idalia claimed at least two lives, one in Florida and the other in Georgia. 

Idalia's impact from damage and lost economic activity is expected to be in the $12 to $20 billion range, according to Moody's Analytics.

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• National Hurricane Center