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Avalanche Forecast

Archived

Apr 18th, 2024–Apr 19th, 2024

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

Regions

Glacier.

Expect a variety of conditions between different elevation bands & keep your head on a swivel while moving through wind-effected terrain.

Recent snow may slide easily on the crust and may gain enough mass to push you off your intended line.

Confidence

High

Avalanche Summary

No new natural avalanches were observed in the hwy corridor on Thursday.

A field team on Wednesday observed a natural size 2 wind slab avalanche which started at ridge top and ran on north facing terrain. Explosive control on Wed produced a size 1.5 wind-slab from a tree-line slide path.

Over the weekend there was a natural avalanche cycle triggered by strong sun and high freezing levels. All observed avalanches were loose/wet and no bigger than size 2.5.

Snowpack Summary

10-20cm of snow covers a crust that exists everywhere but high north. Recent winds have blown the new snow into wind slabs in immediate lee features.

The upper snowpack consists of a series of laminated crusts from the recent spring like conditions. The Feb 3rd crust is the dominant mid-pack layer down ~110cms and still produces isolated planer results when tested.

Below tree-line, the snowpack has gone through a number of melt freeze cycles and is in spring conditions.

Weather Summary

High pressure continues until Saturday where the ridge breaks up and light precip & unsettled conditions set in.

Tonight: Clear, Low of -10°C. Nil precip, freezing level at valley bottom.

Fri: Sunny, Alp high -3°C, light northeast winds, FZL 1800m.

Sat: Sunny with cloudy periods, Nil precip, high 3°C FZL 2300m

Sun: Flurries, 12cm, high 0°C. Moderate to Strong West winds, FZL 2000m

Terrain and Travel Advice

  • Be carefull around freshly wind loaded features.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.