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Avalanche Forecast

Archived

Feb 22nd, 2024–Feb 23rd, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

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.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.