Avalanche Forecast

Issued: Mar 23rd, 2021 4:00PM

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

Avalanche Canada MBender, Avalanche Canada

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Wind slabs at upper elevations are the main concern with the best quality snow up high on north aspects. 

Summary

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

TUESDAY Night: Cloudy with clear periods, light to moderate west and northwest wind, treeline temperatures around -5 C.

WEDNESDAY: Cloudy with flurries and 5-10 cm of new snow, moderate southwest wind, treeline temperatures around -4 C, freezing level 1300 m.

THURSDAY: Mix of sun and cloud, light northwest wind, treeline temperatures around -3 C, freezing level 1500 m.

FRIDAY: Mix of sun and cloud, moderate west and northwest wind, treeline temperatures around -2 C, freezing level 1700 m.

Avalanche Summary

Reports from Monday suggest the new snow formed some thin reactive slabs, with a few size 1.5 natural storm slab avalanches reported, as well as a few explosive controlled storm slab avalanches size 1.5 to 2. There were several skier triggered size 1.5 to 2 storm slab avalanches late in the afternoon on Monday in the Whitewater backcountry. These were on west, north and northwest aspects at treeline. This MIN on Monday outlines the reactivity of the new snow nicely.

Snowpack Summary

Flurries over the past several days have delivered 15-30 cm of snow. This snow has generally been stable, but there could still be some wind slabs at higher elevations. This snow sits above a widespread crust, with the exception of high north-facing terrain. A persistent weak layer from late January is buried 80 to 150 cm deep, but is unlikely to trigger as the last reported avalanche on this layer was in late February.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Be alert to conditions that change with elevation and sun exposure.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

Problems

Wind Slabs

An icon showing Wind Slabs

Recent snow may be reactive on steep wind affected slopes.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Mar 24th, 2021 4:00PM

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