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Archived

Avalanche Forecast

Apr 12th, 2018–Apr 13th, 2018
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Conditions will change throughout the day, continually assess hazards as the day progresses.

Weather Forecast

Clouding over this morning, expecting 5cm at higher elevations and rain in the valley bottom. Freezing level will reach 1500m and winds will be light to moderate from the NW. Probably see the skies clear early tomorrow morning, then the next front will pass over Rogers pass, depositing another 20mm of precipitation by Saturday morning.

Snowpack Summary

A fresh surface crust formed by yesterdays warm temperatures and cool temps overnight exists on all aspects, with 5cm of storm snow at higher elevations. Moist snow may be found below the crust in the top 20cm of the snowpack. Well-settled mid and lower snowpack with the Mar 15 crust complex down 70-90cm on solar aspects.

Avalanche Summary

Sometime last night we had a size 3.5 out of Macdonald Gully #11! Possibly cornice triggered, ran full path into the creek. This avalanche is an outlier compared to the avalanche character we observed yesterday or lack thereof, as avalanche activity has generally tapered off over the last few days with more typical spring-like conditions.

Confidence

Due to the number of field observations

Avalanche Problems

Loose Wet

Rising FL and rain could destabilize surface layers resulting in loose moist avalanches. A Moderate re-freeze overnight should have formed a crust well into treeline on all aspects and into the Alpine on Solar aspects after yesterday's warm up.
Use extra caution on slopes if the snow is moist or wet.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Wind Slabs

On Tuesday evening winds reached extreme values from the South forming wind slabs. We also have a persistent layer we're tracking down 70-90cm, which is currently dormant but may wake up with a big enough trigger.
Avoid travel on slopes that are exposed to cornices overhead.Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2