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Avalanche Forecast

Archived

Feb 17th, 2022–Feb 18th, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Storm slabs will be most reactive in terrain exposed to the wind, and where they overlie Surface Hoar and or a crust.

Expect sluffing in steep unsupported terrain features that was not affected by the wind.

Weather Forecast

On Friday expect flurries, moderate SW wind, and the FL to hover around 1300m. Saturday we are expecting ~10-15cm of new snow moderate SW winds, gusting strong, and the FL to stay around 1200m. Sunday they are just calling for flurries.

Snowpack Summary

Storm slabs developed Thursday with Strong SW winds and ~10cm of new snow, bringing our storm total to 30cm. The new snow and strong winds buried a layer of SH in sheltered terrain, old hard wind slabs in the Alpine, and crusts on all aspects BTL and solar slopes into the Alpine. The Jan 29 SH layer, buried 50-80cm, seems to be rounding.

Avalanche Summary

On Thursday field teams triggered 2 size 1 very soft wind slabs on a North aspect at TL. The crown was ~35cm deep, ~5-10m wide, and ran for ~50m. Also on Thursday, one large avalanche occurred in the HWY corridor, on a South aspect starting in the Alpine, terminating far above the HWY.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.