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Avalanche Forecast

Archived

Mar 30th, 2014–Mar 31st, 2014

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

Regions

Glacier.

Today is a good day to use conservative route selection. Storm slabs are likely to trigger today.

Weather Forecast

Freezing level 1400m. 70% chance of flurries today, with 5cm snow possible. For Monday a mix of sun and cloud with isolated flurries.

Snowpack Summary

Storm snow layers have been slow to bond and remain skier triggerable. An additional 18cm of snow overnight now adds more load to these layers. Southerly wind will have created deep slabs below ridge crests on N through E aspects. Solar aspects have sun crusts buried at various depths. Feb 10 layer is down on average 2m and remains a concern.

Avalanche Summary

Numerous loose moist avalanches yesterday in the hwy corridor, most size 2.0 and on all aspects. A small cycle out of steep extreme terrain is likely happening now from the overnight storm. These avalanches have the potential to step down to weak layers deeper in the snowpack creating much larger slides, which could run to valley bottoms.

Confidence

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.

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.