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Avalanche Forecast

Jan 29th, 2017–Jan 30th, 2017
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: South Rockies.

Strong winds have been forming touchy wind slabs with what's left of our loose surface snow. Deeper in the snowpack, our persistent slab problem lives on.

Confidence

Moderate -

Weather Forecast

Monday: Mainly cloudy with isolated flurries and a trace of new snow. Winds moderate to strong from the west. Freezing level returning to valley bottom with alpine temperatures around -7Tuesday: A mix of sun and cloud with scattered flurries bringing approximately 5cm of new snow. Winds light to moderate from the northeast. Alpine temperatures of -9.Wednesday: A mix of sun and cloud. Winds light from the northeast. Alpine temperatures of -15.

Avalanche Summary

No new avalanches have been reported. The main concern continues to be the possibility of triggering the weak faceted layers deeper in the snowpack. Ongoing winds have also been observed creating thin fresh slabs reactive to human triggering at upper elevations.

Snowpack Summary

Up to 10 cm of low density snow has been undergoing heavy wind redistribution over the past few days, joining previous hard, wind-affected surfaces and forming thin layers of wind slab in lee terrain at higher elevations. Below 1500 metres you may find an isolated thin breakable rain crust about 1 cm thick. In the Elk Valley north area near Crown Mountain on Tuesday the height of snow was 90 cm with foot penetration of 80 cm; or almost to ground. Some solar exposed terrain in the alpine may have a thin sun-crust about 3 cm thick, and this may have a few cm of light dry snow above . The snowpack is quite variable throughout the region. In deeper snowpack areas, the snowpack appears to be well settled with isolated concerns about the mid-December facet layer buried 50-100 cm deep. In shallow snowpack areas and lower elevations, the snowpack is weak and faceted. In these areas, winds have formed isolated hard slabs above weak facets and created the potential for large persistent slab avalanches.

Avalanche Problems

Wind Slabs

Ongoing strong winds can be expected to continue creating thin fresh wind slabs in lee terrain on Monday. Watch for patterns of wind transport as you gain elevation and exercise extra caution when traveling around ridge crests.
Use caution in lee areas. Wind loading will be forming fresh slabs.Use ridges or ribs to avoid pockets of wind loaded snow.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Triggering deeper weak layers remains possible where hard slabs sit above weak sugary snow.
Danger exists where denser snow overlies weak, sugary snow below.Be aware of the potential for full depth avalanches due to deeply buried weak layers.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3