What to know: Border 2 FireSize: 4,250 acres, 10% contained, moderate rate of spreadEvacuation centers: Parking lot at Edwards Cinema, 2951 Jamacha Road, El Cajon, 92019 & Southwestern College, 900 Otay Lakes Rd, Chula Vista, CA 91910.Road closures: Alta Road is closed to traffic just south of Otay Mesa Road; Otay Lakes Road closed from Wueste to CA-94 Campo RoadSchool closures: Chula Vista Elementary School District and the Sweetwater Union High School District closes some schoolsAdvisories: A smoke advisory is in effect for Otay Mesa and the surrounding areas A large vegetation fire began burning Thursday afternoon on a hilltop near the U.S.-Mexico border. As night fell, the flames cast an eerie glow across Otay Mountain. At a little before 2:30 p.m., Cal Fire San Diego tweeted out that the border fire had already burned 20 acres and had a “dangerous rate of spread.” However, firefighters had downgraded the rate of spread to moderate, meaning that their efforts were beginning to bear fruit. Flames from the fire could be seen racing up a hillside on Otay Mountain, near the Otay Mountain Truck Trail. By 8:30 p.m., the fire had spread to 600 acres by 5 a.m. Friday it grew to 1,000 acres and by 6:30 a.m. the fire was at 4,250 acres and 10% contained.