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Avalanche Forecast

Archived

Jan 29th, 2022–Jan 30th, 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 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

New snow and winds will bury surface hoar, crusts and previously wind affected snow. Storm slabs will be building throughout the day on Sunday and will likely become prone to human triggering.

Good stability has come to an end... for the time being.

Weather Forecast

Seeing the sun and venturing into steep terrain has been delightfully therapeutic, but the approaching storm system will bring back deep pow skiing, the forests will be filled with, WAHOO's, again. Snow begins Saturday night, seeing 20-40cm by early Monday. Winds on Sunday 20-50km/hr from the SW and freezing levels will remain at valley bottom,.

Snowpack Summary

Wide spread wind affect in the alpine and tree line. Surface hoar (5-15mm) growing on the near surface facets in sheltered areas. A thin breakable crust is found on steep solar aspects. All of these interfaces will be buried by the incoming 20-40cm of snow.

The Jan 20 (2-4mm) surface hoar is down 35cm. The Dec 1 crust/facet combo is down 1.5 - 2.5m.

Avalanche Summary

We are expecting avalanche activity / hazard to increase by the end of the day on Sunday as the incoming storm system buries surface hoar, crusts and old wind slabs.

No new avalanches observed on Saturday.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

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.