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Archived

Avalanche Forecast

Jan 22nd, 2014–Jan 23rd, 2014
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Purcells.

Confidence

Good

Weather Forecast

A high pressure ridge is once again set to bring dry conditions with warm alpine temperatures.Thursday: Dry. Alpine temperatures initially cool, around -5C, but rising late in the afternoon. Ridgetop winds light, up to 15 km/h from the NW. Friday and Saturday: The inversion is fully in place, with a strong above freezing layer from around 2300 to 3400m. Expect some Valley cloud, that may actually be quite high in places, and strong alpine sunshine. Ridgetop winds 10-20 km/h from the NW.

Avalanche Summary

On Wednesday, sluffing and very thin wind slabs were observed size 1 in steep terrain in the recent new snow. On Tuesday, explosive avalanche control produced avalanches up to size 2 that ran on the basal facets on N and NW aspects in the alpine. No natural activity has been reported for several days.

Snowpack Summary

The recent dry, warm weather has generally consolidated the upper snowpack. Old, stubborn hard wind slabs may exist under a skiff of new snow. Steep, sun exposed features are most likely seeing a daily melt-freeze cycle.A basal facet/crust combo (weak sugary snow above and below a crust) near the ground is still a concern in some areas. The depth of this layer makes triggering an avalanche on it unlikely (maybe a heavy load on a thin spot in steep terrain, rapid temperature change, or cornice fall), but the consequences would be large and very destructive.

Avalanche Problems

Deep Persistent Slabs

The chance of triggering a deep persistent slab is greatly reduced. However if you did trigger such an avalanche, the consequences would be great. The most suspect slopes would be thin or variable alpine start zones on steep convex slopes.
Conditions have improved, but be mindful that deep instabilities are still present.>Caution around convexities or areas with a thin or variable snowpack.>Be aware of the potential for full depth avalanches due to deeply buried weak layers.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 3 - 6