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Avalanche Forecast

Archived

Mar 25th, 2025–Mar 26th, 2025

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

Regions

Glacier.

Ski quality has turned to garbage and avalanche conditions are very dangerous!

Avoid all avalanche terrain and let the temperatures cool off before planning any mountain activity.

Confidence

Moderate

Avalanche Summary

A widespread natural avalanche cycle is expected on Wednesday as freezing levels rise to near mountain top.

Neighboring regions have reported serious incidents and large avalanches. Similar conditions are expected in Rogers pass as we see the same warming trend begin to enter our forecast region.

Snowpack Summary

10-20 cm of Moist snow on the surface up to 2100m on Tuesday has formed a breakable crust at treeline & below.

All elevations have a storm slab approx. 60 cm deep sitting over the March 5th persistent weak layer (PWL). The March 5 PWL consists of a crust &/or surface hoar and is down 60-120cm. There is concern that storm slabs will step down to this PWL and may entrain wet loose snow at lower elevations.

Additional PWL's from Jan/Feb are now buried 140-190cm deep.

Weather Summary

Freezing Levels Rising to near mountain top tomorrow. Yikes!

Tonight Scattered wet flurries, 5cm. Wind SW 30-45km/h. Freezing level (FZL) 2300m

Wednesday Cloudy, scattered showers. 4mm precipitation. Alpine high 4 °C. Wind SE 15-25. FZL 3000m

Thursday Snow mixed with rain, 20 cm. Wind SW 10. FZL 2200m

Friday Flurries, 8cm. Light westerly wind gusting to 35

Terrain and Travel Advice

  • Only the most simple non-avalanche terrain with no overhead hazard is appropriate at this time.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Wet avalanche activity may step down to deeply buried persistent weak layers at lower elevations.

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.