#SoFo #EagleRiver obs from today. Lots of HUGE whumphs-collapses in both the Harp and North Bowl areas. 1: video of large slab that collapsed and cracked out around #skier while ascending 2 Bowls (adjacent to Harp) at ~4300’ S aspect consisting of a few inches of loose fluff (from late Monday) on a couple inch dense wind packed moist snow slab (from early Monday) on a thin faceted persistent weak layer over an old, dense wind packed bed surface. 2: natural wind slab #avalanche (SS-N-D2-R2-I) that likely occurred early Monday from the dense, moist #snow and #wind before temps cooled down and a few inches of blower fluff were deposited. 3: video of problematic slab, persistent weak layer, and bed surface setup in the upper #snowpack. 4: photo of dense wind packed slab and thin faceted weak layer. 5: map of skier triggered collapse and recent natural avalanche in 2 Bowls. 6: photo from North Bowl of skier triggered collapse and recent natural avalanche in 2 Bowls as shown in previous map.

A post shared by Anchorage Avalanche Center (@anchorage_avalanche_center) on Feb 13, 2018 at 9:56pm PST

A #skier with dogs triggered this #avalanche with smaller sympathetic adjacent releases today on Peak 2 at ~3000’ WSW aspect. Presumably SS-ASu-D1.5-R1-I consisting of a few inches of loose low density powder from late Monday over a couple inches of dense moist snow (slab) from earlier Monday overlying a faceted persistent weak layer on a dense wind packed bed surface. Whumphing-collapsing was experienced in this zone by observers: a snarling red flag of danger. PC: @brian.skimolife

A post shared by Anchorage Avalanche Center (@anchorage_avalanche_center) on Feb 13, 2018 at 9:14pm PST