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Archived

Avalanche Forecast

Apr 19th, 2023–Apr 20th, 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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

The hazard may be locally elevated if more snow falls than forecast.

Assess the bond of new snow before increasing your exposure, human triggering remains possible.

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.

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

Minimal natural avalanche activity in recent days.

Snowpack Summary

12cm of new snow sits over a crust on all aspects except high due north which still hold dry snow. 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

A mix of sun and cloud with isolated flurries continues through to the weekend.

Tonight: Cloudy w/ flurries 5cm, Alp low -7 °C, light winds, FZL 1000m

Thurs: Cloudy w/ sunny periods flurries, Alp high -3 °C, light southwest winds, FZL 1900m

Fri: Sun/cloud, isolated flurries, Alp high -4 °C, light west winds, FZL 1900m

Terrain and Travel Advice

  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Keep in mind the crust offers an excellent bed surface for avalanches.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.

Avalanche Problems

Storm Slabs

Expect storm slab reactivity to persist longer in wind loaded features and/or where it sits over a crust. Where the sun comes out and warms the surface snow it may be enough to increase reactivity and time to scale back your exposure.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Snow that fell in the past 2 weeks covers a series of crusts combined with surface hoar/facets in some locations. These layers have shown wide propagation and remain a concern. Storm slabs in motion have the potential to step down to these layers creating large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3