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Avalanche Forecast

Archived

Nov 8th, 2020–Nov 9th, 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.

Rugged travel, cold temps and short days make getting back to the car safely critical. Leave yourself lots of time to get out at the end of the day. A tweaked knee could turn into an epic if it happens just before dark.

Weather Forecast

High pressure from the North gives cold and clear weather through Monday evening.

Today: Sunny. Alpine High -10 C. Ridge wind moderate NE. Freezing level (Fzl) valley bottom.

Tonight: Clear with cloudy periods. Alpine Low -13 C. Ridge wind light NW.

Monday: A mix of sun and cloud. Alpine High -10 C. Ridge light SW. Fzl valley bottom.

Snowpack Summary

Outflow N'easterly wind is loading what little snow is available for transport in to lees. Last weeks storm gave heavy rain as high as 2400m, and over 50cm of snow accompanied by extreme W winds at upper elevations. The storm ended with a rapid cooling trend; refreezing the saturated snowpack and leaving a dusting of 5-10cm on the crusted surface.

Avalanche Summary

A large avalanche occurred yesterday in Cougar Corner #2 (a S facing path below treeline with a slabby start zone), this was suspected to have been a glide crack release.

A significant loose wet avalanche cycle occurred with the last storm with slides up to size 3; the debris from this is now refrozen and presents a significant hazard to skiers.

Confidence

Due to the number and quality of field observations

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.

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.