Avalanche Forecast

Issued: Feb 25th, 2023 4:00PM

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

Avalanche Canada matt, Avalanche Canada

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Natural avalanche activity is tapering, but still happening. Avoid wind loaded terrain in the alpine!

Summary

Confidence

Moderate

Avalanche Summary

Natural activity continued today. Active avalanches were reported near Tent ridge. Sz 2-2.5 and running full path.

Snowpack Summary

Today we went to dig a profile at one of our standard locations, the Dog Leg area. We found 152 cm of snow in a moderately wind loaded treeline area. The 20-30cm of new snow is sitting on a 2cm thick, dense (pencil) wind crust layer. We wondered if this is what the recent cycle was sliding on, but that's just speculation. We had a failure on that layer in tests. Below the wind crust, we encountered the dreaded facets at about 50cm down. The Nov interface is down 110cm. Here, the snowpack is mostly depth hoar and large facets. On a more general note the winds were transporting tons of snow today. Any exposed area from E to S is heavily loaded. Cornices are also growing with the wind.

Weather Summary

Wind. Sailors might like a forecast like ours, but for us skiers/climbers/winter enthusiasts, the wind gets old in a hurry! Winds will increase yet again tonight with high alpine wind hitting the 70km/hr range, but fading to a mere 50km/hr by noon. In lower terrain, expect more like 30-40km/hr and gusty. Skies will be mixed, with maybe a few flurries. Does snow whipped up by the wind count as a flurry? Temperatures? These will be between -12 and -8.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • 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.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Problems

Wind Slabs

An icon showing Wind Slabs

Sustained winds have begun to expose gravel in the alpine. Treeline winds are still variable which means slabs could be anywhere.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Very Likely - Certain

Expected Size

1 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Our snowpack has gained enough depth/strength to not sink to the ground every step. Unfortunately the deeper layers haven't changed. The entire lower half is either facets, or depth hoar.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

2 - 3.5

Valid until: Feb 26th, 2023 4:00PM

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