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Avalanche Forecast

Archived

Dec 2nd, 2019–Dec 3rd, 2019

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

Hazard may increase throughout the day if the incoming storm arrives earlier than forecast.

Keep an eye for changing conditions today.

Weather Forecast

Today: A mix of sun and cloud with isolated flurries. Freezing level 800m. Moderate SW winds.

Tonight: We move into an unsettled westerly flow. 7 cm forecast with moderate SW winds. Freezing level steady at 800m

Tuesday: Storm continues with another 14 cm forecast with continued moderate SW winds.

Sunset time is currently 15:50hrs, plan accordingly.

Snowpack Summary

8cm of snow overnight covers a facetted upper snowpack and previously wind affected surfaces. The main layer to watch (Nov 23rd surface hoar/ crust) is buried 25-45cm. This layer exists as a crust on all aspects below 1600m and on steep solar aspects into the alpine; surface hoar around treeline.

Avalanche Summary

Artillery verification shoot yesterday produced no results in steep, north alpine start zones. No new avalanches reported from the highway or the backcountry in the last 5 days.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Problems

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.