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Avalanche Forecast

Archived

Apr 27th, 2024–Apr 28th, 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.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

Glacier.

Afternoon showers have the potential to destabilize the upper snowpack quickly, scale back your terrain use if it's raining.

Still getting out? Consider posting a MIN report!

Confidence

Moderate

Avalanche Summary

On Satruday, there were a few natural avalanches up to size 2.5 in the highway corridor. These were loose wet avalanches, triggered by convective showers and daytime warming.

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

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

Snowpack Summary

Heavy new snow with light to moderate wind has created fresh 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 off the central coast continues to push stormy weather (with cooling temps) our way.

Tonight: Clear periods/ isolated flurries. Alpine low -4°C, Freezing Level (FZL) 1600m. Gusty moderate Southwest ridgetop winds.

Sun: Cloudy, flurries (up to 5cm). High -2°C, FZL 1900m. Gusty mod SW wind.

Mon: Cloudy. Low -8°C, High -5°C, FZL 1700m. Mod W wind.

Tues: Flurries. Low -8°C, High -3°C, FZL 1900m.

Terrain and Travel Advice

  • Avoid exposure to areas with overhead hazard during periods of rain.
  • Snow is accumulating at higher elevations despite lower elevations being almost snow free

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.