A 3,132-acre wildfire at Camp Pendleton reached 35% containment Saturday, Oct. 17, after forcing repeated closures of Interstate 5 between San Diego and Orange County.

The Henderson Fire shut down I-5 in both directions between Basilone Road and Vandegrift Boulevard on Friday, Oct. 16, with vegetation burning on both sides of the freeway, according to Cal Fire. The California Highway Patrol reopened all lanes by 5:15 p.m. Friday, Fox 5 reported. Cal Fire warned the highway could close again immediately if conditions required it.

That was the second closure in two days. The fire also forced I-5 shut on Thursday, Oct. 15, between Basilone Road and Harbor Drive before CHP reopened lanes shortly before 6 p.m., according to the Coast News Group.

Fire activity moderated Friday night as winds eased and humidity increased, Fox 5 reported. The jump from 2,080 acres Friday to 3,132 acres Saturday reflected improved fire mapping, Cal Fire noted.

Firefighters stopped it at 20 acres.

That was a separate blaze. The Scales Fire broke out Friday along I-5 near the San Onofre checkpoint, according to Cal Fire.

The Henderson Fire started at 2:35 p.m. Thursday near Henderson Street and Brown Street on the Marine Corps base, according to Cal Fire's incident page. The Camp Pendleton Fire Department is the lead agency, with the San Diego County Incident Management Team providing support.

On Friday morning, Cal Fire reported the fire was "crossing containment lines on the northwest side." Crews gained ground Friday night, building handlines in Las Pulgas Canyon and using bulldozers to improve control lines along the fire's northwest side, Fox 5 reported.

As of Saturday, 290 personnel, 45 engines, 12 crews and two dozers were assigned to the fire, according to Cal Fire. Air tankers flew suppression missions as conditions allowed.

On the base, an evacuation order for the Las Flores area was issued and later lifted. Temporary evacuation points were set up at Paige Field House and the 21 Area Fitness Center. The Las Pulgas Gate remained closed to all traffic except emergency vehicles.

A heat advisory remained in effect for San Diego County's coastline through 8 p.m. Saturday, with highs expected in the upper 80s to mid-90s, according to the National Weather Service. A red flag warning also covered much of Southern California through Saturday evening.

"Luckily, we're on the backside of the winds right now, so things are going to be trending down for the most part," Sam Zuber, a meteorologist with the National Weather Service office in San Diego, told the Los Angeles Times.

The cause of the Henderson Fire remains under investigation. Residents can monitor updates at Cal Fire's Henderson Fire incident page or sign up for alerts at AlertSanDiego.org.