Avalanche Forecast

Issued: Feb 4th, 2019 3:00PM

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

Alberta Parks michael.olsthoorn, Alberta Parks

Good skiing can be found at tree line and below.  Careful evaluation of wind slabs  is essential before adventuring in the alpine.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

The cold continues with a slight daytime warming. Tuesday and Wednesday are forecast for daytime highs of -15c with overnight lows of -27c. Skies should be a mix of sun and cloud with light wind from the North on both days. No snow forecast for the near future.

Avalanche Summary

One size 2 slab on an East aspect on an alpine feature on Mt. Murray.One size 2.5 slab on a NE aspect starting in the alpine in the Black Prince zone.One size 2 slab on a NE aspect starting in the alpine was observed in the Gypsum Creek zone.

Snowpack Summary

35-45cm of storm snow overlies a strong mid snowpack. This storm snow is low density at tree line and below. In the alpine, this storm snow has either turned into a wind slab or is loose and dry; it will be important to determine this before adventuring into the alpine. The buried sun crust on solar aspects down around 60cm is still a concern with this new load as well as the isolated January 17 SH also down around 60cm around 2200m. The basal facets are down 80-100cm and should still be on everyone's radar as any avalanche triggered in the upper snow pack has the potential to trigger this lower weakness.

Problems

Wind Slabs

An icon showing Wind Slabs
New snow will require several days to settle and stabilize.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
Thin areas should be avoided.
Be aware of the potential for full depth avalanches due to weak layers at the base of the snowpack.Carefully evaluate and use caution around thin snowpack areas.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1.5 - 3

Valid until: Feb 5th, 2019 2:00PM

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