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Archived

Avalanche Forecast

Apr 24th, 2024–Apr 25th, 2024
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Haines Pass.

Watch for warming-related problems as the day heats up. Triggering a buried weak layer remains possible.

Confidence

Moderate

Avalanche Summary

We haven't received reports of avalanche activity for the past few days. The latest activity was the observation of some large slab avalanches out of steep alpine terrain on Saturday. These avalanches likely failed on the weak layer described in the Snowpack Summary.

Looking forward, it remains possible for humans to trigger this weak layer. Warming-related problems such as wet loose, wet slab, and cornice releases will also increase with daytime warming.

Snowpack Summary

Sun-exposed slopes have a surface melt-freeze crust that turns moist during daytime warming. Shaded alpine slopes have a soft, settled snow surface.

A layer of surface hoar or facets associated with a crust may be found about 30 to 70 cm deep.

Cornices are large and looming at this time of year.

Weather Summary

Wednesday Night

Clear skies. 10 km/h northwest ridgetop wind. Treeline temperature -1 °C.

Thursday

Sunny. 10 km/h north ridgetop wind. Treeline temperature 3 °C. Freezing level 1700 m.

Friday

Sunny. 10 to 20 km/h south ridgetop wind. Treeline temperature 2 °C. Freezing level 1600 m.

Saturday

Mix of sun and cloud. 10 km/h southeast ridgetop wind. Treeline temperature 2 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
  • Be alert to conditions that change with elevation and sun exposure.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

Avalanche Problems

Persistent Slabs

A weak layer may exist around 30 to 70 cm deep, which was likely the culprit of some large natural avalanches on the weekend. Use caution and assess for this layer, particularly in high consequence terrain.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1.5 - 2.5

Loose Wet

Naturally triggered wet loose avalanches may occur in steep terrain during the heat of the day. Cornices also weaken and could release naturally. These could step down to deeper layers, resulting in large avalanches.

Aspects: East, South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5