Avalanche Forecast

Archived

Nov 29th, 2021–Nov 30th, 2021

Alpine

Natural and human triggered avalanches likely.

Treeline

Natural and human triggered avalanches likely.

Below Treeline

Natural avalanches possible, human triggered probable.

Alpine

Widespread avalanches certain.

Treeline

Natural and human triggered avalanches likely.

Below Treeline

Natural and human triggered avalanches likely.

Alpine

Natural and human triggered avalanches likely.

Treeline

Natural and human triggered avalanches likely.

Below Treeline

Natural avalanches possible, human triggered probable.

Regions

Glacier.

With another massive dump and warming temps coming our way, we will be in an elevated danger rating for the next few days.

Natural and human triggered avalanches are very likely. Travel in avalanche terrain is not recommended.

Weather Forecast

We are forecast to get ~90mm of warm moisture between now and Thurs.

Tonight: Snow, 15cm, FZL 1500m, mod / gusting strong SW winds

Tues: Snow, 25cm, FZL 1700m, mod/strong SW winds

Wed: Snow, 40cm, FZL 1900m, strong / gusting extreme SW winds

Thurs: Snow, 15cm, FZL 1400m, light / gusting strong W winds

Fri: Isolated flurries, FZL 500m, light winds

Snowpack Summary

Over 1m thick, heavy storm slabs are widespread at all elevations. The mid and lower snowpack is generally rounded and well bonded. Below 1900m the November 15th crust exists in the mid-snowpack. Early season hazards have been freshly buried below 1700m, slide over the lumps and bumps with caution.

Avalanche Summary

Calmer weather Monday has brought a lull in the natural avalanche action, but the next storm is knocking at the door and natural activity will certainly resume Tues/Wed.

Artillery avalanche control Sun am saw numerous sz 3-3.5 avalanches run to valley bottom. Natural avalanche activity to sz 3 was widespread the last 3 days.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.