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Avalanche Forecast

Archived

Jan 1st, 2020–Jan 2nd, 2020

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

Regions

Glacier.

If there is a rise in wind and/or temperature today, danger ratings will bump up rapidly. Be observant of any changes in the weather!!

Weather Forecast

Today, flurries will continue dropping another 5-10cm. Two things to watch for are rising temps and increasing winds. Freezing levels may rise to 1500m, while W'ly winds will increase to mod/strong. Thurs brings cold temps, flurries, and mod W winds. Another storm rolls in Fri/Sat, bringing 25-30cm and strong SW winds.

Snowpack Summary

40-50cm of snow now sits on the Dec 27th surface hoar. Previous Mod to Strong S-SW winds redistributed the new snow on lee features in the Alpine and exposed areas of Tree Line. The mid and lower snowpack has been settling and gaining strength; however, the Dec 11th surface hoar (5-12mm) still persists down 100-140cm.

Avalanche Summary

Several natural avalanches to sz 2 were observed from the highway yesterday, all occurring on steep, N-facing terrain.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.