California authorities say avalanche debris has been spotted during a search for a missing Marine who failed to return from a backcountry skiing trip through the Sierra Nevada. First Lt. Matthew Kraft began trekking the Sierra on Feb. 23. The Inyo County Sheriff’s office says the search on Sunday was primarily air-based because of the risk of avalanches on the ground. Crews from multiple agencies are searching a 400-square-mile area. On Friday they found a Jeep that Kraft parked at the start of his trip about 130 miles south of Bridgeport.