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Archived

Avalanche Forecast

Mar 6th, 2018–Mar 7th, 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
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
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

Regions: Glacier.

Stick to your standard safe backcountry travel techniques. Human triggered avalanches are possible. Avoid cornices and continually update your hazard assessment.

Weather Forecast

Today we could see sun, cloud and isolated convective flurries. Temperatures will remain cool with an alpine high of -10 and light winds. The sun could pack some punch today if it breaks through the cloud, this will be the main weather factor influencing the snowpack structure. Snow starting Thursday and we could see up to 20cm by Friday.

Snowpack Summary

~25 cm new snow fell over the past few days burying wind slabs or sun crusts aspect dependent. The late Feb crust/facet combo is down 30-50cm on solar aspects and has potential to be a good bed surface. The January PWL's are buried 150-200cm

Avalanche Summary

Crossover avalanche path had a natural size 3.5 yesterday afternoon! This cornice trigger was an outlier compared to the rest of the avalanche's size and destructive potential, that we observed yesterday. No new avalanches reported from the backcountry, but nearly a dozen relatively small avalanches occurred on extreme terrain in the HWY corridor.

Confidence

Due to the number of field observations

Avalanche Problems

Storm Slabs

Storm snow has formed a slab at ridgetop, wind exposed terrain or in steep unsupported rolls. Sunny breaks are forecast today, even short bursts of the strong spring sun could make the new storm snow more reactive.
Use caution on open slopes and convex rolls Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

A suncrust is buried 40-70 cms on solar aspects. This layer has the potential for human triggering, dig down and assess the snowpack before committing to your line.
Carefully evaluate terrain features by digging and testing on adjacent, safe slopes. Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5