Avalanche Forecast
Lizard Range and Flathead
Expect persistent slab avalanche activity to continue as the snow sitting above the persistent weak layer further settles and consolidates into a slab. Adopt a conservative approach in the coming days.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.
- Choose supported slopes without convexities at treeline where buried surface hoar may be preserved
- Watch for whumpfing, hollow sounds, and shooting cracks.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Moderate winds have created fresh wind slabs in the alpine.
Travel and Terrain Advice
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
- Be cautious as you transition into wind affected terrain.
- Use ridges or ribs to avoid pockets of wind loaded snow.
Avalanche Summary
On Thursday there was a report of a skier triggered Size 2 avalanche in Orca bowl involving a group of 11 with 4 people caught and partially buried. See here for details on the MIN. This avalanche occurred on a northeast aspect at 1975m and reportedly running as a windslab sitting on a crust.
Additionally, there have been several natural avalanches between 1600m and 1800m on steep or open glades on all aspects. This is where the mid-December layer has been most active.
Snowpack Summary
A persistent weak layer buried mid-December is 40-70 cm below the surface. This layer can be found in a variety of locations, but most commonly between 1600m and 1800m and consists of crusts on south and west facing slopes and feathery surface hoar in sheltered areas at and below tree line. It has been producing sudden results in recent snowpack tests.
At higher elevations, wind has modified the snow pack creating a stiffer snow on top of softer snow condition. The lower snowpack is generally well settled with a thick prominent crust that was buried near the end of November. This crust has generally been reported to be unreactive, however it is possible that it may have been the bed surface for a skier triggered avalanche that happened on Thursday (See Avalanche Activity section above for details).
See here for a recent forecaster blog for a summary of the tricky conditions in the snowpack and strategies on how to work around a persistent slab problem.
Weather Forecast
Occasional flurries with minor accumulations through the forecast period.
SATURDAY: 2-5cm Friday overnight into Saturday, with another 2-5cm possible throughout the day / Light to moderate southwest wind / Alpine temperature -4 / Freezing level 900m
SUNDAY: Cloudy with flurries / Light to moderate west wind / Alpine temperature -4
MONDAY: Cloudy with isolated flurries, accumulation 3-10cm possible / Light southwest wind / Alpine temperature -3
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A weak layer composed of surface hoar and/or crusts is buried 40-70 cm below the surface. This layer continues to be reactive to human traffic.