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Archived

Avalanche Forecast

Apr 18th, 2023–Apr 19th, 2023
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
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: Glacier.

Despite reduced natural avalanche activity, human triggering continues to occur.

Limit your exposure while the new snow settles and bonds.

Confidence

High

Avalanche Summary

On Tuesday a field team was able to easily trigger several small slab avalanches at the interface of Sunday's storm. A few small naturals were also observed in the backcountry.

On Monday a remotely triggered size 2 slab avalanche occurred at Balu pass.

Snowpack Summary

The recent 10cm of new snow is not well bonded to a previous surface crust found on all aspects except high true north. Below this the Apr 9 crust is down 20-40cm (BTL) and Mar 31 crust is down 40-60cm. Both remain reactive in tests.

The mid and lower snowpack are generally strong but the Nov 17 basal weakness can still be found 20-40cm off the ground.

Weather Summary

Calm weather with isolated flurries later in the week and mainly cloudy skies.

Wed: Cloudy no precipitation, Alp high -5 °C, light northwest winds, FZL 1800m

Thurs: Cloudy w/ isolated flurries, Alp high -5 °C, light southwest winds, FZL 1800m

Fri: Cloudy w/ isolated flurries, Alp high -3 °C, light southwest winds, FZL 1900m

Terrain and Travel Advice

  • Approach lee and cross-loaded slopes with caution.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.

Avalanche Problems

Storm Slabs

Storm slabs remain reactive to human triggers. The recent snow arrived with strong winds so expect this problem to be amplified in immediate lee and cross-loaded features and take a few days to bond fully.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

Recently formed slabs have been slow to bond to the previous surfaces of suncrust, surface hoar and/or facets. These slabs remain a concern and have shown wide propagation. Storm slabs in motion may step down to these older layers creating large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 3