20-21

SS-ASr-R2-D1-I SE Aspect , 9000 feet, 35-40 degrees Remotely triggered from tracks visible on right side of photo. This photo shows one of five similar remotely triggered avalanches today in the Silver Creek drainage and 9595 Glades. All five avalanches released from 35-40 degree rollovers at the interface beneath ~20cm of new snow and were all size D1. The five avalanches spanned from 8500-9500 feet elevation on SE, S, SW, and NW aspects. No activity (e.g. wumphing, cracking, avalanches) was observed below the new-old snow interface.

Photo: "Avalanche in Star Creek (sorry for the poor quality, small window of clear weather) From our point of view it looked like storm snow."

South of town skier saw: "R1-D1 50' wide 1-2' deep wind slab that avalanched off of the S portion of Climax Bowl near the ridge line. It also triggered another isolated pocket 200' down in the track that was about 25' wide and looked to be no more than 1' deep. It then entrained all of the new snow and washed over the cliff band that runs through midline resulting in a substantial powder cloud and subsequent debris pile."

Another group reported: "We observed some fresh slab avalanches today around Cooke City.  (about 5 s slab avalanches observed). Most of the slides looked to have occured last night or early this am, and involved just new snow 12-18" deep.  All of the slides observed were on SE aspects, with some propagating about 150' wide."

A third group northwest of Cooke City reported: "Slides were seen on all aspects, mid and upper elevations.  Some stepped down into older persistent weak layers.  Observed about 15 fresh sla slab alanches."

From obs: "While driving down the spur road in Big Sky, I noticed this small avalanche on the SW face of Yellow Mountain around 3:30pm"

A natural avalanche occurred on an East aspect in the Maid of the Mist basin. It appeared to have slid last night/this morning. Visibility made it difficult to determine the extent of the debris or the depth of the crown.