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Avalanche Forecast

Archived

Feb 21st, 2024–Feb 22nd, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
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.

Regions

Glacier.

Avalanche hazard has risen with new snow and warm temperatures.

Rider triggering of new snow is possible.

Confidence

Moderate

Avalanche Summary

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

Isolated natural activity has been observed along highway corridor Monday/Tuesday this week. Avalanches have been dry, loose sluffs from steep terrain.

Snowpack Summary

Warm temps are settling 10-20 cm of new snow into a slab. This slab overlies a spring like surface. This includes: soft snow in protected terrain on polar aspects, breakable crust on steep solar aspects, and variable wind slab in exposed terrain at ridge top.

A strong crust (widespread below 2500m) is down 40-60cm.

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 brief ridge of high pressure is in place for Thurs, followed by an approaching frontal system from the NW on Fri.

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

Thurs: Cloudy/isolated flurries, Alp high -6°C, light W wind, FZ Lvl: 1600m

Fri: Flurries, 5cm, Alp high -7°C, light/gusting mod SW wind, FZ Lvl: 1300m

Sat: Flurries, 10cm, Alp high -6°C, light/gusting to mod W wind

Terrain and Travel Advice

  • Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.
  • Be cautious of buried obstacles especially below treeline.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.