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Avalanche Forecast

Archived

Apr 26th, 2024–Apr 27th, 2024

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

Regions

Glacier.

It's warm and wet out there!

There will be stormy weather and fluctuating freezing levels, which could mean rain on top of fresh snow. If that's the case expect ski/snowboard quality to decrease and the avalanche danger to increase.

Still getting out? Consider posting a MIN report!

Confidence

Moderate

Avalanche Summary

On Friday there was a natural avalanche cycle triggered by rain & warm temps. This cycle produced avalanches up to size 3.5

There was also a report of a few skier triggered size 1's from the Herdman Couloir. MIN Report Here

On Monday, a field team in the Fidelity zone was able to ski-control several dry/loose sz 1 avalanches on N aspects, as well as ski-cut a wind slab on an E aspect.

Snowpack Summary

Heavy new snow with light to moderate wind has created storm slabs. These slabs sit atop a series of crusts on all aspects except high north faces, where they overlie dry snow.

The Feb 3rd crust, down ~110cm, is the dominant mid-pack layer and still produces isolated planar results when tested.

With high freezing levels expect rain soaked snow at treeline and below. This will shrink our already dwindling snowpack at lower elevations.

Weather Summary

A low pressure system is moving through the region, bringing stormy weather the next few days. There is uncertainty in the models about snow/rain amounts but most are showing steady precipitation & warm temps

Tonight: Cloudy with flurries. Alp low -1°C, Ridgetop wind: South 10-20 km/hr, Freezing Level (FZL): 1900m

Sat: Flurries: 7 cm, Wind SW 15-30km/hr, FZL: 2300m

Sun: Snow: 10 cm, Ridge wind SW 15-35, FZL: 1800m

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the old surface.
  • Avoid exposure to areas with overhead hazard during periods of rain.

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.