Avalanche Forecast

Issued: Dec 26th, 2017 8:00AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Persistent Slabs and Wind Slabs.

ian gale, Parks Canada

Glacier.

Cold temps and light winds have preserved the excellent snow quality.Assess the snowpack before entering your line.Happy Holidays!

Summary

Weather Forecast

A strong ridge of high pressure is keeping cold Arctic air sitting over most of BC. The winds will be 5-15km/hr from the Southwest with no snowfall expected. Today we will see an alpine high of -16 deg C, that's the warmest it'll get, bring an extra layer or two and stay in the sun! Looks like snow and warmer temps are on the way Friday ....maybe

Snowpack Summary

Cold temps are facetting the surface snow and keeping it soft & unconsolidated. Below tree line 40cm sits on the Dec 15 layer surface hoar which is widespread and largest where sheltered. In the alpine, Dec 15 is a thin crust on solar aspects and small surface hoar on polar aspects. Pockets of wind slab exist in the alpine and at tree line.

Avalanche Summary

No new avalanches observed yesterday.Numerous natural avalanches from a few days ago up to sz 2.5 in steep terrain.

Confidence

Wind effect is extremely variable

Problems

Persistent Slabs

30-50cm of snow is settling into a persistent slab which sits on the Dec 15 surface hoar. Expect the slab to be more reactive as you transition into steep and/or wind effected terrain. Solar aspects have a thin crust layer below the slab.

Watch for whumpfing, hollow sounds, and shooting cracks.Be aware of the potential for large avalanches due to the presence of buried surface hoar.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 3

Wind Slabs

Variable winds formed pockets of wind slab in the alpine and exposed areas at tree line on all aspects. These slabs may have surface hoar or crust underneath, leading them to be sensitive to human triggering.

Variable winds have created pockets of wind slab on all aspects.Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Dec 27th, 2017 8:00AM