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Archived

Avalanche Forecast

Mar 7th, 2021–Mar 8th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Strong convective weather could make for an exciting weather day!

Be prepared for intense storm cells in localized areas and subsequent increases in storm slab reactivity.

Weather Forecast

An unstable air mass today paves the way for strong convective activity: cloudy with sunny periods, isolated flurries, even the risk of a thunderstorm! High pressure sets in Monday.

Today: 5-10cm snow. Freezing level 1300m. Wind SW 20-35km/h.

Tonight: Cloudy with a trace of snow. Freezing levels lower to valley bottom. Wind SW 15-35km/h.

Snowpack Summary

At treeline,15cm of new snow sits atop a breakable crust and 10cm of moist snow. Localized extreme winds associated with the passing of a cold front on Friday, increased snow loading near ridges. The February facet/ crust persistent weak layer is down 80-120cm.

Avalanche Summary

Warm temperatures with new snow overnight Friday created a moist avalanche cycle with several size 1.5-2.5 avalanches observed from steep north aspects in the alpine in the highway corridor. Friday, a loose wet avalanche cycle occurred from steep solar aspects at all elevations up to size 2.5, as well as two notable size 3.0 slab avalanches.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Avalanche Problems

Storm Slabs

More snow and wind forecast for today. 15cm of new snow fell overnight Friday and sits atop a breakable crust at treeline and below, and wind slabs in exposed alpine areas.

  • Watch for fresh storm slabs on exposed lee slopes and open areas at all elevations.
  • Watch for signs of instability such as whumphing and cracking.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2.5

Wind Slabs

Wind slabs in alpine start zones have been reactive to skier triggers this week. These slabs are buried under Friday night's snow, but they should not be forgotten. These slabs have a tendency to propagate on solar aspects where they sit on a crust.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3