We were snowmobiling up portal creek today near the hidden lakes trailhead and I set off a small slide remotely by riding below a small ridge. The slide was about 3 feet at its crown 30 or 40 feet wide and ran about 40 yards. It just came down to where my track had crossed underneath. Everything was fine and we stayed safe and continued on with our plan and had a nice day.
Number of slides
r-A remote avalanche released by the indicated trigger
Snow Observation Source
Slab Thickness units
Single / Multiple / Red Flag