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Avalanche Forecast

Archived

Jan 25th, 2025–Jan 26th, 2025

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

Regions

Glacier.

A strong temperature inversion and solar radiation may destabilize surface snow layers.

Be sure to monitor for changing conditions as you climb out of the cold valley bottoms.

Confidence

Moderate

Avalanche Summary

Field teams have observed skier triggered size 1's the past couple days, which were isolated to the new snow on old firm bed surfaces. Despite their small size, they were moving fast in steep terrain.

An avalanche cycle was observed in the park on Wednesday. The avalanches were in the 1.5-2 range and all looked to be the result of wind loading. Recent MIN reports also describe a reactive windslab problem.

Snowpack Summary

Moderate SW winds overnight on the 23rd created variable wind slabs in the alpine and exposed treeline. Sheltered areas have ~15cm of low density, faceted (sugary) snow atop a denser, wind-pressed layer. 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

A strong ridge of high pressure is firmly planted. Mainly clear skies and no precipitation for the foreseeable future.

Tonight Clear periods. Ridge wind W 10 km/h. Alp low -10C°. Alpine temp inversion.

Sun Sun & cloud. Precip: nil. Alpine high -4C°. Ridge wind W 10km/h. Strong alpine temp inversion.

Mon Sun & cloud. Alp high 1 C°. Ridge wind: NW 15 km/hr. Strong alpine temp inversion

Monday

Terrain and Travel Advice

  • Be careful with sluffing in steep terrain, especially above cliffs and terrain traps.
  • Be especially cautious as you transition into wind-affected terrain.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.

Problems

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.