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Archived

Avalanche Forecast

Nov 29th, 2018–Nov 30th, 2018
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Extra caution is advised with the surface hoar weak layer in the snowpack. Stick to well supported terrain.

Weather Forecast

A mix of sun and cloud with light winds and alpine high temperature of -6C. Freezing levels are forecast to rise to 1300m. Cloudy with sunny periods for Friday with light winds and similar freezing level.

Snowpack Summary

40cm of snow covers a surface hoar or suncrust layer at TL & sheltered ALP locations. Wind transported snow yesterday overloading the weak layer and triggering soft slabs on the surface hoar. Moist slabby snow below 1600m. October crust near ground may be poorly bonded on some high elevation north aspects. Snow depth 74cm at 1300m &150cm at 2000m.

Avalanche Summary

One size 2.5 slab avalanche off of the SE aspect of Balu Peak. Possibly initiated by point release pulled a storm slab at the bottom of the rock face and ran 1/3 of the way down the bowl. A dozen slides out of steep rocky terrain recorded in the highway corridor east of the pass up to size 3.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

SW winds yesterday have formed soft slab on lee features in the alpine. Point releases out of extreme terrain have the potential to pull soft slabs when they reach planar features. Human triggering of these slabs is also a concern.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

We are shifting the November 21st surface hoar layer to a persistent weak layer. This layer is widespread and possibly most pronounced at treeline elevation.
Use caution on open slopes and convex rolls Pay attention to overhead hazards like cornices which could trigger persistent slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2.5