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Avalanche Forecast

Archived

Apr 7th, 2022–Apr 8th, 2022

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

Regions

Glacier.

A push of warm air continuing into Thursday night and forecasted precipitation/wind Friday will leave the avalanche hazard elevated. 

Weather Forecast

A frontal system brings rain at lower elevations and snow at upper elevations Fri.

Tonight: Isolated showers, Alp low 0*C, FZL 1700m, mod S winds, gust to 65

Fri: Flurries, 13cm Alp high -1, FZL 1900m, Light winds/Strong gusts

Sat: Few Flurries, Trace, Alp high -8, FZL 1000m, Light winds

Sun: Few Flurries, Trace, Alp high -7, FZL 900m, Light winds

Snowpack Summary

Surface crust form over Friday morning at treeline and in the alpine on all aspects. Below treeline expect isothermal/spring snow.

A series of late March/early April crusts are buried down below 30-80 cm of storm snow. This mostly fell as rain below treeline.

The December 1st crust is down 1.5-2m. Large cornices are present through out the park.

Avalanche Summary

As of 1600 Thursday: 2 small sz 1.5 loose moist natural avalanches from N aspects in the treeline along the highway corridor.

Wednesday:

Explosive hand charge testing at treeline on north and east aspects triggered 2 sz 1 avalanches, failing down 15cm below a soft slab.

A natural glide slab avalanche sz 3 was observed west of the rogers pass summit.

Confidence

Intensity of incoming weather systems is uncertain on Friday

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.

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.

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.