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Archived

Avalanche Forecast

Feb 24th, 2021–Feb 25th, 2021
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
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

Regions: Jasper.

Another pulse of precipitation and wind will keep the hazard elevated for a few days. Watch for wind effected terrain. Dig down to assess the bond of the new/old snow interface.

Weather Forecast

An additional 10cm of snow is forecasted in the Parkers ridge area over the next 36 hours. This will yet again be accompanied with Moderate to Strong South Westerly winds. Temperatures will be -8 and cooling off to -20 for the weekend

Snowpack Summary

Mod to Strong ridge top winds from the SW have created wind slabs or hard surface conditions in Alp & TL. Wind slabs overlie facets which will bond poorly. In sheltered areas the top 30-60cm is faceted snow over a supportive mid-pack where the snowpack is deeper. Thin snowpack areas are weak, un-supportive, and facetted.

Avalanche Summary

Forecasters down south on 93N noted wide spread wind effect in all alpine and exposed tree line features with strong to extreme snow transport at ridge tops today. Small loose dry observed with the suns help at the heat of the day on South West-West aspects.

Confidence

Avalanche Problems

Wind Slabs

Contuined Moderate to Strong SW winds are creating wind slabs

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Be aware of the potential for wide propagations due to the presence of hard windslabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5

Loose Dry

Loose dry in steep terrain remain a hazard for ice climbers. Small sluffs could have big consequences in the wrong terrain.

  • Be careful of loose dry power sluffing in steep terrain.
  • If triggered dry loose point releases can form deeper deposits in terrain traps.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 1.5

Deep Persistent Slabs

Caution in thin snowpack areas where triggering is more likely. This is a low probability but high consequence problem.

  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3