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Archived

Avalanche Forecast

Apr 26th, 2017–Apr 27th, 2017
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Jasper.

Steady rain on Thursday will increase the avalanche hazard below tree-line. 

Weather Forecast

15 cm of snow is expected above tree-line by late Thursday afternoon.  This snow will come in with light W winds that will shift to North.  The freezing level will rise to 2000 m  Thursday.  Snow will continue into Saturday with 25 cm total.

Snowpack Summary

20 cm of loose new snow sits over a melt freeze crust in many locations above tree line. The mid-pack is consolidated and bridges the weak base. The bottom snowpack is a mix of weak facets and depth hoar.

Avalanche Summary

Some small solar point releases noted out of rocky areas today.

Confidence

Forecast snowfall amounts are uncertain on Thursday

Avalanche Problems

Loose Wet

Rain (5-20 mm) possible on Thursday will increase this problem below tree-line.
Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.

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

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 2

Cornices

Cornice failures are still being noted periodically on West aspects 2500-2800m.
Give cornices a wide berth when travelling on or below ridges.Avoid travel on slopes that are exposed to cornices overhead.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3

Deep Persistent Slabs

The deep instability could be triggered by a cornice failure. It is well bridged by a solid mid-pack.
Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4