Quick report
S aspect. ~5200’ elevation. Human triggered D1 avalanche 2’ deep and 15’ across. Ran for about 200’ elevation. Slope of trigger point was around 45 degrees for 5’ distance then around 37 degrees. 3-4” had fallen during the day. 2-3’ of snow had fallen in the last 4-5 days. I had just returned from a week out of town and had not been able to observe the snowpack during a very active storm week/weekend. We should have dug, but we only did ski cuts to check stability on test slopes. Weather was lightly-moderately snowing consistently. The strong spring sun started showing through the snowfall about 3 minutes before dropped in around 12:30 PM and 10 minutes before the avalanche. We were aware of storm slab possibility but stayed in a tree-filled run where we thought there would be enough anchor points to prevent a slide. We were wrong. We had false confidence from no results from ski cuts and a moderate danger rating for the day from NWAC. Next time(s) we will be digging at the top of our runs, lesson learned! Human triggered avalanche from riding cautiously over a short, steep section of terrain without turning or jumping. Slope broke beneath me and I straight-lined with as much speed as possible to a nearby wind-lip above the obvious natural slide path. Snow still hit my back after I stopped but the majority moved past me and my riding partner who had already ridden down a lower-angle slope before I dropped, and had stopped above me on the same wind-ridge below a few trees. Luckily we were both still standing there and completely fine. Another avalanche, about 3’ deep, seemed to have been remotely triggered beneath our stopping point by the human-triggered avalanche. Photos of this crown are attached. I did not take photos of the human triggered avalanche. All of the recent storm snow went in these slides, which is different from all other reported avalanche activity from today 3/17.