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Avalanche Forecast

Archived

Feb 1st, 2025–Feb 2nd, 2025

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

Regions

Glacier.

Natural avalanche activity will taper off but human triggered avalanches will remain likely

Stay disciplined and dial back your terrain choices.

Confidence

Moderate

Avalanche Summary

Avalanche control at Rogers Pass produced avalanches up to size 3 running full path.

While natural avalanche activity may taper off as temps drop, the slab sitting over surface hoar will be primed for human triggering.

Neighbouring operations are reporting that the Jan 7th/9th surface hoar is starting to become reactive as a slab builds on top of it. This is the layer to watch out for.

Snowpack Summary

Recent 20-40cms of storm snow buries widespread surface hoar and sun crusts(on steep solar aspects).

Below this interface are firm, wind pressed surfaces in exposed areas and low density sugary snow in sheltered areas.

The Jan 7th layer is down 30-60cm, comprised of surface hoar (all aspects) and/or a thin crust on steep S aspects. The mid and lower snowpack are well bonded and strong.

Weather Summary

Scattered flurries Saturday night, with a clearing/cooling trend starting Monday

Tonight Flurries 5cms. Alp Low: -16°C. Ridge wind SW 25-45 km/h. Freezing level (FZL) at valley bottom(VB)

Sun Cloud & sun with flurries. Alp high -15°C. Ridge wind S 15-25km/hr, FZL VB

Mon Cloud & sun with flurries. Alp high -17°C. Ridge wind SE 20km/h.

Tues Mix of sun & cloud Precip: nil. Alp high -19°C. Ridge wind E 15km/h.

Terrain and Travel Advice

  • Be aware of the potential for larger than expected storm slabs due to buried surface hoar.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Make conservative terrain choices and avoid overhead hazard.

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.