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Avalanche Forecast

Archived

Nov 19th, 2021–Nov 20th, 2021

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

Regions

Glacier.

Travel below 1800m is rugged!

Allow extra time for egress to navigate the awkward crust extravaganza.

Weather Forecast

Tonight: trace of snow, freezing level (fzl) 500m, wind from the SW 25-45km/h

Tomorrow: trace of snow, fzl 900m, wind SW 30-40km/h

Sunday: 5cm snow, fzl rising to 1100m, wind SW 30km/h

Snowpack Summary

On Wednesday, our team dug a profile at treeline on a SE aspect @ ~2100m on Mt Fidelity. Our profile showed a height of snow of 222cm with the top 140cm being storm snow. No significant test results were observed within the storm snow at this location. The November 15th crust is widespread below 1800m, and makes travel exceptionally poor.

Avalanche Summary

No new natural or human triggered avalanches have been observed or reported from the back country and highway corridors. We registered the Howitzers yesterday firing artillery at very steep terrain in the highway corridor with little to no result. And for those that missed it, there was a very large avalanche cycle on Sunday and Monday to size 4!

Confidence

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

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.