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Avalanche Forecast

Archived

Dec 1st, 2021–Dec 2nd, 2021

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

Regions

Glacier.

The gross, wet weather bomb has left us. The time for calm has come.

Take a slower pace as you return to the backcountry. Have a look around. It is a changed landscape due to the whopping amounts of snow and rain this past week.

Weather Forecast

Wow. That was a ugly conclusion to the stormy weather. Now, things get cool and calm.

Tonight: Flurries, 10cm, FZL 1400m, mod / gusting strong SW winds

Thurs: Isolated flurries, FZL 1300m, light / gusting mod W winds

Fri: Cloudy with sunny periods, Alpine high -10*C, light W winds

Sat: Cloudy with flurries, 5cm, Alpine high -10*C, light W winds

Snowpack Summary

Rain to above 2200m has fallen on 1-1.5m storm slabs, saturating the surface. The mid to lower snowpack is generally rounded and well bonded. Tree-line and below tree-line travel is difficult, with extremely dense, rain-soaked snow. Early season hazards still linger below 1700m.

Avalanche Summary

Natural avalanche activity to sz 3.5 Tues night through Wed raged with the warm temps, extreme ridge-top winds, and rain into the alpine.

Artillery control is on-going while the bulletin is being written. Needless to say, results from explosives have been a blast to observe, with avalanches running to valley bottom, sz 3 to 3.5.

Confidence

Freezing levels are 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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.