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Avalanche Forecast

Archived

Jan 30th, 2025–Jan 31st, 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 and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
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.

Regions

Glacier.

An incoming storm heightens avalanche hazard over the next few days. Give the storm slab some time to settle.

Confidence

Moderate

Avalanche Summary

Expect new snow to be easily triggered in steep terrain.

Few dry loose and wet loose small avalanches have been reported early in the week. These have been both sun and rider triggered in steep terrain.

Field teams have observed rider triggered size 1's the past few days, which were isolated to the top 10-15cm of snow on old firm bed surfaces. Despite their small size, they were moving fast in steep terrain.

Snowpack Summary

New snow on Thursday (Jan 30th) covered 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

Moderate to heavy precipitation through to Saturday.

Tonight 6cm. Alp Low: -9°C. Ridge wind SW 25 km/h. Freezing level (FZL) at valley bottom

Fri 10cm. Alp high -7°C. Ridge wind SW 30km/h. FLZ 1000m.

Sat 7cm. Alp low -15°C. Ridge wind W 15km/h gusting to 50km/h. FZL 1000m.

Sun Trace precip. Alp low -22°C. Ridge wind SE 30km/hr, FZL 1000m

Saturday

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Be careful with sluffing in steep terrain, especially above cliffs and terrain traps.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.