Boletín de aludes

Northwest Inland

Feb 12 – 14, 2021Avalanche Canada
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Archivado · caducó 6 years ago

Peligro de aludes

Sun
Mon
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Still windy and cold! Be mindful of wind loaded features and use a conservative mindset when planning objectives in these temperatures.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2.5

    Variable wind has formed reactive slabs on multiple aspects, and outflow winds continue to impact any remaining loose snow and reverse and cross load features. Avalanches will be most likely in wind loaded areas and where the snow feels stiff or punchy. Note that in some places avalanche hazard may be elevated where winds have penetrated into unexpected places even at lower elevations.

Confidence

Moderate -

Weather Forecast

FRIDAY NIGHT - A few clouds/ strong to extreme south east wind / alpine high temperature near -20

SATURDAY - Partly cloudy, strong to extreme south east wind / alpine high -16

SUNDAY - Increasing cloud, light flurries possible, light to moderate south west wind / -17

MONDAY - Cloudy / light flurries possible / highs of -13

Avalanche Summary

A size 2 natural windslab was reported near the ski area. Wind slabs have also been reactive to human triggering in wind loaded and cross loaded features. Most ski cut results have been in the size 1 to 1.5 range, but bigger terrain features could produce larger propagation and bigger avalanches! 

Check out this forecaster MIN post from Microwave from Thursday to see the widespread wind effects. 

A Feb 9th MIN observation shows some stiff wind affected snow over sugary facets.

Evidence of recent natural wind slab avalanches (likely occurring Saturday) were observed on Sunday as discussed in this MIN report. Small loose dry avalanches were also reported, in some cases likely triggered by the sun.

Snowpack Summary

Hard slabs, scoured slopes and sastrugi will be present where outflow effects have been the strongest. In more sheltered zones, reactive wind slabs will be found on a variety of aspects and elevations due to terrain effects and the variable wind directions.

In more sheltered areas, the cold temperatures are encouraging surface faceting. The late January interface is down 30-50 cm, consisting of isolated surface hoar in sheltered locations, and previous wind effect in exposed areas. On solar aspects, a buried sun crust can be found below 1000 m. 

The lower snowpack has two decomposing crust layers. The upper crust is 70-140 cm deep and continues to show occasional hard, sudden results in snow pits. The deeper crust at the bottom of the snowpack is more prevalent in shallow snowpack ranges. These deep persistent layers seem to be dormant under the current conditions, but shallow rocky slopes should still be carefully assessed and approached with caution. 

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Be aware of the potential for wide propagation.

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