TRABUCO CANYON, Calif.—Firefighters worked through the night and this morning, monitoring and constructing containment lines in order to limit the damage of a wildfire that broke out in the Cleveland National Forest near the Riverside-Orange County line that has consumed approximately 553 acres. Overnight, fire crews observed little fire activity while constructing containment lines. Ground crews assisted by bulldozers will work to extend those lines Thursday and utilize three water-dropping helicopters to assist in extinguishing hot spots. Air tankers were also on stand-by to respond if needed. The wildfire has not threatened any homes or other structures so far, fire authorities said. The Jim Fire broke out at approximately 11:20 a.m. Wednesday in the Trabuco Ranger District in the Holy Jim Canyon area, according to an incident report from the National Wildfire Coordinating Group. U.S. Forest Service firefighters responded with fire engines, hand crews, and air resources, assisted by the …