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Avalanche Forecast

Archived

Nov 6th, 2020–Nov 7th, 2020

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

Regions

Glacier.

Expect rugged travel in the shallow and refrozen snowpack at lower elevations. Remember to think about avalanche hazard as travel improves with elevation; we recently received over 50cm of snow up high.

Weather Forecast

Cool temps and mostly stable weather are forecast for the weekend.

Friday: A mix of sun and cloud. Alpine High -4 C, Low -8 C. Light ridge wind. Freezing level (Fzl): 1400 m.

Saturday: A mix of sun and cloud. Alpine High -8 C. Ridge wind light NE. Fzl: 1000 m.

Sunday: Sunny. Alpine Low -15 C, High -9 C. Ridge wind light NE. Fzl 500m.

Snowpack Summary

The recent wet storm saturated the snowpack below 2400m. Over 50cm of new snow fell in the upper alpine, accompanied by W winds of up to 160km/hr. A cooling trend followed, and has refrozen this saturated snow. It continued to snow as it cooled, so there may be some low density snow over the previously devastated surfaces as you gain elevation.

Avalanche Summary

Numerous loose wet avalanches up to size 3 (large) were observed in the highway corridor yesterday from all aspects. No backcountry observations have been made since the onset of the storm, but I suspect a similar cycle to have occurred.

Confidence

Due to the number and quality of field observations

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.