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Archived

Avalanche Forecast

Apr 21st, 2017–Apr 22nd, 2017
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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
3: Considerable
The avalanche danger rating at treeline will be considerable
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

The Maligne Road was closed Friday afternoon due to loose wet avalanche hazard.  We are on the verge of spring conditions.  Travel early and be off slopes by mid-day.

Weather Forecast

Clear and cold overnight on Friday should  develop a melt freeze crust into Saturday morning.  Freezing level above 2000 m both Saturday and Sunday afternoon.  10 cm snow possible on Sunday.  A cloudy cooler weekend ahead.

Snowpack Summary

10-20 cm snow overnight has rapidly settled.  The upper snowpack is moist or wet depending on aspect and elevation.  The mid-pack is solid and bridging the weak base. The bottom 30cm of the snowpack consists of weak facets and depth hoar mixed around the Nov rain crust. Below 1500m there is no snow.

Avalanche Summary

Numerous loose wet avalanches to size 2 tree-line and below on Friday.  Maligne Road closed Friday afternoon due to increasing loose wet avalanche hazard.

Confidence

Freezing levels are uncertain on Saturday

Avalanche Problems

Loose Wet

A melt freeze crust will loose strength by Saturday afternoon as freezing level rises into tree-line. 
Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.Start and finish early before the surface crusts melt.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Deep Persistent Slabs

The deep instability could be triggered by a cornice failure. It is well bridged by a solid mid-pack; however, consider this problem becoming more active particularly on South aspects as the day warms up or the sun comes out.
Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4

Cornices

Cornice failures are still being noted on West aspects 2500-2800m. Give them a wide berth as their failure is hard to predict but increases with sun, warmth, wind-loading, or new snow.
Avoid travel on slopes that are exposed to cornices overhead.Give cornices a wide berth when travelling on or below ridges.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3