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Whistler Backcountry Avalanche Advisory

Issued: Sunday February 18, 2018 4:44pm

Avalanche Summary

Several small wind slabs (size 1) were reported in alpine terrain on Sunday, including a few that ran on buried sun crusts that were up to 60 cm deep on west and south aspects. The wind slabs were reactive to skier and explosive triggers.

More widespread avalanche activity was reported during the storm on Saturday, including many size 1 skier-triggered slabs and a few size 2 natural slabs out of alpine terrain.

Snowpack Summary

In sheltered terrain, cold weather is preserving 30-40 cm of low density snow. In exposed terrain, strong north winds have scoured north facing slopes and loaded south facing slopes. A crust layer can be found beneath the storm snow on sun-exposed slopes and below 1900 m, which has supported some wide propagations in recent storm slab avalanches. Deeper in the snowpack, avalanche professionals are still monitoring the mid-January crust. This layer is now 150-200 cm deep, but a heavy trigger (cornice?) or the next major storm could potentially wake up this layer.

Weather Forecast

MONDAY: Sunny with moderate north wind and alpine high temperatures around -12 C.

TUESDAY: Mostly sunny, light wind, alpine high temperatures around -12 C.

WEDNESDAY: Mix of sun and cloud with isolated flurries, moderate north wind, alpine high temperatures around -10 C.

Advisory for Monday:
Advisory 3-Day Overview:
 
Monday
Tuesday
Wednesday
Alpine
Considerable
Considerable
Moderate
Treeline
Moderate
Moderate
Moderate
Below Treeline
Low
Low
Low
 
Monday
Alpine
Considerable
Treeline
Moderate
Below Treeline
Low

 
Tuesday
Alpine
Considerable
Treeline
Moderate
Below Treeline
Low

 
Wednesday
Alpine
Moderate
Treeline
Moderate
Below Treeline
Low


Current Dangers

Wind Slabs

Strong winds from the north have blown recent snow into touchy slabs at higher elevations.

What Elevations?

What Aspects?

Chances of Avalanche?

Expected Size?


Cornices

Large cornices have formed along ridgelines. They need to be given an extra wide berth from above and below.

What Elevations?

What Aspects?

Chances of Avalanche?

Expected Size?




Forecast provided by Avalanche Canada.

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