No avalanche observed as we crested Cardiff then observed about a half hour later from LSB. Helicopter activity in the area. We’re guessing the heli broke a cornice when it landed and that triggered it. We did not see any skiers in the area when we had visibility before the avalanche occurred. Dry Loose snow within the new storm snow. The slide covered two sets of tracks. The toe of the debris just overran the skinner in/out from Power Outage.