Avalanche Forecast

Issued: Feb 3rd, 2023 2:30PM

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

Avalanche Canada matt, Avalanche Canada

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Winds and warm temperatures are promoting new slabs in lee areas. Approach ridge crests with caution.

Summary

Confidence

Moderate

Avalanche Summary

Nothing new in the region today, but there was a skier triggered sz2 windslab in the Crowsnest Pass area that was triggered yesterday. Treeline, north aspect.

Snowpack Summary

Is it harder to read the same thing everyday, or write the same thing every day? I'm not sure, but for those who like repetitive stories, grab a comfy chair, here we go...

Still no significant new snow out there. But what little snow we had last week has now been blown around into windslabs at most elevations. Given the recent temperature swings, these slabs could very well be reactive and easily human triggered. Climbers should expect to encounter these reactive slabs in small, but consequential pockets between pitches. Routes like Coire Dubh, Sinatra Falls, This House of Sky will all have pocket slabs present.

In lower areas, or solar aspects there is a thin crust developing from the warm weather. Aside from making poor skiing even poorer, this won't pose much of a problem until we get snow.

Don't forget(who could at this point?) about the deep, consequential depth hoar/facet/sugary snow looming way down below. This remains our principal concern and is not to be taken lightly.

Weather Summary

Uhhh, remember yesterday? Yeah, its going to be like that again. Sunday's high is -5, low of -8. Moderate(40km/hr) and gusty SW winds at treeline. And maybe, just maybe a few flurries. We could get enough snow to possibly bury the imprints your poles leave behind in the snow or cover up those pee stains at the bases of the ice climbs.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.

Problems

Wind Slabs

An icon showing Wind Slabs

Strong winds over the past few days has made windslabs in the upper snowpack more reactive.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely - Very Likely

Expected Size

1 - 2

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Thin areas are where this layer will be easiest to trigger. Be thinking about wide propagations as the snowpack above is more cohesive than before.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 3

Valid until: Feb 5th, 2023 4:00PM