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Avalanche Forecast

Archived

Apr 4th, 2022–Apr 5th, 2022

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

Regions

Lizard-Flathead.

Continue to make conservative terrain choices. The storm snow likely hasn't bonded to the underlying crust.

Confidence

Moderate - The snowpack structure is generally well understood.

Weather Forecast

Monday night: Stormy with 5 to 10 cm expected. Moderate to strong southwest winds and freezing levels falling to 1400 m.

TUESDAY: Mostly cloudy with around 5 cm of new snow expected. Moderate west wind and freezing level around 1600 m.

Wednesday: Sunny with no new snow expected. Light to moderate westerly winds and freezing levels rising to 1900 m.

Thursday: Sunny with no new snow expected. Moderate southwest winds. Freezing level rising to 2100 m.

Avalanche Summary

On Monday ski cutting produced storm slab avalanches up to size 1.5 in the alpine and treeline. Several size 1.5 natural storm slab and dry loose avalanches were also observed.

Snowpack Summary

New storm and wind slabs will have form throughout the day on Monday. Below this a crust exists on all aspects to around 2500 m and likely to mountain top on sun affected slopes. This crust will likely be found near the surface at low elevations and become moist as the freezing level rises. 

 The mid and lower snowpack are generally strong and well bonded.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Closely monitor how the new snow is bonding to the crust.

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.