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Avalanche Forecast

Archived

Mar 11th, 2022–Mar 12th, 2022

Alpine
Natural avalanches possible, human triggered probable.
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, 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

North Rockies.

10-20 cm of forecast snow and strong west winds on Friday night will form fresh wind slabs on lee features in open terrain.  

Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.  

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

FRIDAY NIGHT: Snow; 10-20 cm / Strong west winds / Low of -8 / Freezing level valley bottom.

SATURDAY: Mix of sun and cloud / Light west wind / High of -2 / Freezing level 1300 m.

SUNDAY: Mix of sun and cloud / Light west wind / High of -3 / Freezing level valley bottom.

MONDAY: Cloudy with flurries; 5-10 cm / Strong southwest wind / High of 1 / Freezing level 1500 m.

Avalanche Summary

A size 3 cornice failure that did not trigger a slab on the slope below was reported on Thursday.

Riders may get surprised by widely propagating storm slabs that are sitting on crusts and/or surface hoar.

Snowpack Summary

10-20 cm of forecast snow and strong west winds on Friday night will form fresh wind slabs on lee features in open terrain.

The new snow will be sitting on a variety of surfaces including hard wind affected snow, sun crusts on southerly slopes, and surface hoar on shady or sheltered slopes. Expect wind slabs to be most reactive where they are sitting on either a sun crust or surface hoar.

The mid and lower snowpack is generally well-settled and strong in most areas, with multiple crusts throughout. No recent persistent slab avalanches have been reported on these layers.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Minimize your exposure time below cornices.

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.