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Archived

Avalanche Forecast

Apr 3rd, 2018–Apr 4th, 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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Previous strong winds have created windslabs in the alpine. Use caution as you approach lee features and be mindful of changing snow conditions.

Weather Forecast

The weather pattern is shifting to a westerly flow which will bring warmer more typical spring weather. Today expect cloudy with sunny periods, 15-30 km/hr SW winds & freezing level to 1100m. No precip is forecast for the next 24-48hrs, but localized convective flurries are possible. A Pacific low brings warmer air & snowfall late in the week.

Snowpack Summary

55cm of settled storm snow at treeline and above in the past week. Strong N'rly alpine winds have loaded lee features. Storm snow is settling into a cohesive slab on a buried crust/facet layer down 70-90 which is now whumphing and showing sudden test results. This suncrust exists on East-West aspects & is most reactive around treeline.

Avalanche Summary

On the 31st we observed a natural avalanche cycle to size 3. These were triggered by intense solar heating on the new storm slab. Cornices are also large and have been reported to be failing by our near neighbors just outside the park.

Confidence

Wind effect is extremely variable

Avalanche Problems

Wind Slabs

Previous strong variable winds have blown the recent storm snow around and loaded lee features in the Alpine. While these slabs are fresh they will be susceptible to human triggering, especially in steep unsupported terrain or with solar heating.
Use caution in lee areas. Recent wind loading has created wind slabs.Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

70-90cm of settled snow sits on the mid March crust/facet combo. This layer was whumphing and tests showed potential for wide propagation if this layer is triggered. Avoid convexities and thin snowpack areas on solar aspects.
Be aware of the potential for wide propagations.Avoid convexities or areas with a thin or variable snowpack.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3.5