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Archived

Avalanche Forecast

Feb 22nd, 2024–Feb 23rd, 2024
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Avalanche hazard has risen with new snow and warm temperatures.

As the winds pick-up, watch for freshly transported snow making human triggered avalanches possible.

Confidence

Moderate

Avalanche Summary

Natural slab avalanches as big as size 2.5 were observed Thursday from the steep north facing terrain of Mt. Macdonald & Mt. Green.

On Wednesday, a field team triggered loose, moist avalanches below tree-line in steep, unsupported terrain.

Isolated natural activity was observed along the highway corridor Monday/Tuesday this week. Avalanches were dry, loose sluffs from steep terrain.

Snowpack Summary

A thin surface crust exists below tree-line & warm temps are settling 20 cm of new snow into a slab, which overlies a spring like surface. This includes soft snow in protected terrain on polar aspects, breakable crust on steep solar aspects, and wind slab in exposed terrain at ridge top.

A strong crust (widespread below 2500m) is down 50cm.

The mid to lower snowpack continues to round - except in isolated areas of the alpine where an unusually thin & faceted snowpack exists.

Weather Summary

A cold front approaches bringing snow and strong winds.

Tonight: Cloudy/flurries, Alp low -6°C, ridgetop winds W light, FZ Lvl: 1300m

Fri: 4cm, Alp high -6°C, Mod to Strong to Extreme SW wind, FZ Lvl: 1300m

Sat: 10cm, Alp high -5°C, light/gusting mod SW wind, FZ Lvl: 1300m

Sun: 22cm, 10cm, Alp high -4°C, light/gusting to mod W wind, FZLvl: 1200m

Terrain and Travel Advice

  • Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.

Avalanche Problems

Storm Slabs

A fresh storm slab sits on a variety of good sliding surfaces. This problem will be more likely triggered on wind loaded lee slopes from S/SW winds.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2