Avalanche Forecast

Issued: Apr 8th, 2022 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs and Cornices.

Avalanche Canada swerner, Avalanche Canada

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Strong West winds combined with an additional 10-20 cm of new snow may build fresh and reactive wind slabs. 

Summary

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

A cool and unstable weather pattern will exist through the weekend.

Friday Night: New snow 5-10 cm. Moderate to strong West winds at ridgetop and freezing levels near valley bottom. 

Saturday/ Sunday: Cloudy possible sunny periods with new snow 5-10 cm. Moderate ridgetop wind from the northeast. Freezing levels 1000 m. Alpine temperatures near -10 C.

Monday: Mix of sun and cloud. Freezing level near 700 m and alpine temperatures -15 C. Ridgetop winds light from the West.

Avalanche Summary

On Thursday, in the Renshaw area, the field team reported a natural cornice fall from a North-facing alpine slope. This cornice triggered a size 2 slab avalanche from the slope below. 

Snowpack Summary

A new surface crust may exist to 2000 m and higher on southerly aspects and 10 cm of new snow may be found in the alpine. 

Over the past week, up to 50 cm of storm snow blanketed upper elevations. Light to moderate wind may have redistributed the storm snow in exposed high elevation terrain forming pockets of wind slab and large cornices. 

50-70 cm of consolidated snow sits on the thick melt-freeze crust from late March. There has been no recent avalanche activity reported on this layer.

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.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

Problems

Wind Slabs

An icon showing Wind Slabs

Fresh and reactive wind slabs may exist at upper elevations. 

This brings up to 70 cm of consolidated snow above a crust at treeline and above.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Cornices

An icon showing Cornices

Springtime cornices are large and unpredictable. Give them a wide berth when travelling at ridge crest and avoid overhead exposure.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1.5 - 3

Valid until: Apr 9th, 2022 4:00PM