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Archived

Avalanche Forecast

Apr 6th, 2022–Apr 7th, 2022
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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: Northwest Inland.

Up to 15 cm snow will fall by the end of the day on Thursday with moderate to strong southwest wind. Wind slabs will form throughout the day and be reactive to human triggers.

Confidence

Moderate - Uncertainty is due to the track & intensity of the incoming weather system.

Weather Forecast

Wednesday night: Cloudy, up to 5 cm snow, strong southwest wind, alpine low -4 °C, freezing level around 800 m. 

Thursday: Cloudy, 5-10 cm snow, moderate southwest wind, alpine high 0 °C, freezing level around 1300 m.

Friday: Mix of sun and cloud, 5-10 cm snow, moderate to strong westerly wind, alpine high -2 °C, freezing level around 1000 m.

Saturday: Mix of sun and cloud, trace of new snow, moderate west wind, alpine high -6 °C, freezing level around 700 m.

Avalanche Summary

On Wednesday, a small (size 1) wind slab avalanche was observed in a cross-loaded feature near ridgetop. 

A naturally triggered size 2 wind slab avalanche was reported on a steep cross-loaded alpine feature on Tuesday. Many small dry loose avalanches were observed as well. 

Snowpack Summary

The new snow will add to the 10-40 cm of recent snow which overlies a hard melt-freeze crust.

Recent moderate southwest winds removed the snow above the crust in wind-exposed areas and formed wind slabs on lee terrain features at treeline and above.

Cornices are very large and exposure to them should be minimized, especially during warm or windy weather.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Avalanche Problems

Wind Slabs

Up to 15 cm snow will fall by the end of the day Thursday. Moderate to strong southwest wind will redistribute the snow and form fresh wind slabs throughout the day in lee terrain features in the alpine and at treeline. Wind slabs will be reactive to human triggers. 

Use ridges or ribs to avoid areas of wind-loaded snow. 

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2