What to KnowAcres: 1,404 acresRoad closures: All lanes of both sides of I-5, which were previously closed, were reopened as of 6 p.m. Closures may resume depending on conditionsRoad closures on base: Las Pulgas Road to Stuart Mesa Road to the intersection of Las Pulgas Road and Brown Street. Stuart Mesa Road to Fire Base Gloria closed in both directionsEvacuation order on base: Las Flores (41 Area) has since been liftedEvacuation points: Paige Field House,  located in the 11 Area, and 21 Area gym Amid hot and dry Santa Ana wind conditions, a brush fire sparked on U.S. Marine Corps Base Camp Pendleton Thursday afternoon and quickly exploded to more than 1,000 acres, briefly closing a stretch of the Interstate 5 freeway during the busy afternoon traffic hours. The Henderson Fire sparked around 2 p.m. and quickly spread amid gusty wind conditions, which prompted some evacuations on the military base, according to the nonprofit fire tracking website Watch Duty. A power outage and road closures have also been reported. Both sides of I-5, all lanes, were closed from Basilone Road near San Onofre State Beach to Harbor Drive in Oceanside at about 5 p.m. but were reopened at about 6 p.m., California Highway Patrol said. However, closures may resume depending on conditions. Metrolink trains will continue to operate between Orange County and Oceanside as long as it is safe to do so, according to the agency. Amtrak trains have already been shut down due to high tides. SkyRanger 7 flew over the freeway in the afternoon, showing a big plume of black smoke casting a large shadow over drivers on the I-5. Evening footage showed traffic slowing to a crawl as cars were diverted away from the interstate. As of Thursday night, the base has not yet disclosed the cause of the fire. A large plume of dark smoke could be seen rising high above the U.S. Marine Corps Base Camp Pendleton on Oct. 15, 2026. (SkyRanger 7) Smoke could be seen from the Henderson Fire rising west over the Interstate 5 on Oct. 15, 2026. (SkyRanger 7) Drivers on I-5 south approach smoke from the Henderson Fire on Oct. 15, 2026. (Credit: Elizabeth Griesser) At least three air tankers and several ground crews with the Camp Pendleton Fire Department responded to the incident. By the evening, all air attack and air tankers were released for the night and multiple night flying helicopters would continue putting out the flames into the night, according to Watch Duty. Las Pulgas Road is closed from the intersection of Las Pulgas Road and Stuart Mesa Road to the intersection of Las Pulgas Road and Brown Street, according to the military base. Stuart Mesa Road, to Fire Base Gloria, is closed in both directions. The Las Pulgas Gate is closed to all vehicles except emergency vehicles until further notice. Please visit the Camp Pendleton road and gate status website for current information and updates. San Diego County was under a high wind warning for the inland, mountain and foothill areas in San Diego County, along with a heat advisory for coastal areas. A heat warning was in effect for coastal communities. Santa Ana winds have the potential to spark and quickly spread wildfires amid hot and dry conditions. San Diego County officials urged residents to use precaution amid the fire-weather conditions. An active smoke advisory was issued for the southern area of the military base, particularly the communities in South Camp Pendleton, Oceanside, Carlsbad and Vista, according to the San Diego County Air Pollution Control District. This is a developing story. Details may change as information is released. This story uses functionality that may not work in our app. Click here to open the story in your web browser. ...read more read less