On President’s Day, February 19, the Mount Shasta Avalanche Center shared reports of a massive D4 avalanche, the second-largest classification, in Avalanche Gulch on Mount Shasta, California. The avalanche occurred naturally during a snowstorm and was discovered two days later.

Related: [PHOTOS] Huge 3-Mile Long Avalanche Travels 5,000-Vertical-Feet and Creates 60-Foot High Walls on Mount Shasta, CA

The storm, which started on February 17, dropped 2.5-3 feet of fresh snow at tree line elevations and even more at higher altitudes. Data from the Old Ski Bowl weather station on the south side of Mount Shasta at 7,900 feet recorded 6.57 inches of snow-water equivalent from the storm.