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Avalanche Forecast

Archived

Mar 24th, 2025–Mar 25th, 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 and human triggered avalanches likely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.

Regions

Glacier.

Storm snow has settled more than expected but human triggering remains likely.

Avoid consequential terrain and be mindful of your overhead hazard at all elations.

Expect the hazard to rise near the end of the day during peak warming.

Confidence

Moderate

Avalanche Summary

Avalanche control using artillery at Rogers pass on Sunday night produced avalanches up to size 3.5.

Natural avalanche activity tapered off as storm intensity eased with no new natural avalanches observed on Monday.

Weather Summary

Additional moisture & elevated freezing levels continue until Friday.

Tonight Mainly cloudy. No precipitation. Wind SW 15-30 km/h. Freezing level (FZL)1500m

Tuesday Flurries/ Rain, 4 cm. Alpine high 2 °C. Ridge wind SW 25-45. FZL 2400m

Wednesday Cloudy, isolated showers. Trace precipitation. Alpine low 0 °C. Wind SW 15-25. FZL 3000m

Thursday Wet snow mixed with rain, 17 cm. Light wind gusting to 35. FZL 2700m

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

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 Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.