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Avalanche Forecast

Archived

Mar 30th, 2025–Mar 31st, 2025

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

Regions

Glacier.

There is still uncertainty with the saturated upper snowpack. Human triggered avalanches are still possible, particularly in the heat of the day.

Expect some rugged travel conditions at lower elevations.

Confidence

Moderate

Avalanche Summary

Strong solar input today triggered a small loose wet cycle from steep sunny slopes.

A rain event into the alpine caused a widespread natural avalanche cycle on Wednesday. Numerous very large wet avalanches ran down into the valley bottom. These avalanches included the deeply buried January Facets.

Since then, natural activity has slowed down but human triggering remains a concern.

Snowpack Summary

Approx 20cm of snow (at treeline and above) sits on a saturated snowpack, where 40mm of rain percolated down over 70cm. Some areas have more recent snow due to convective cells.

The March 25th rain event changed the landscape. Rain runnels are visible high into the alpine, large chunky debris in valley bottoms, and an overall loss in the height of snow.

The March 5 PWL generally consists of a crust and is down 60-120cm.

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

Weather Summary

Instability returns Monday, bringing mainly cloudy skies and convective flurries.

Tonight: Clear periods. Alpine low -4°C. Southwest wind 15km/hr. Freezing Level (FZL) 1100m

Mon: Mainly cloudy. Trace precip. Alpine High -1°C. SE wind 25km/hr. FZL 1900m

Tues: Mainly cloudy. Trace precip. Alpine high -3°C. FZL 1700m. Wind west 10-20km/h

Wed: Mainly cloudy. 6cm precip. Alpine high -4°C. FZL 1600m

Terrain and Travel Advice

  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.
  • Limit exposure to steep, sun exposed slopes, especially when the solar radiation is strong.

Problems

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.