Bollettino valanghe

Northwest Coastal

Mar 4 – 5, 2022Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 5 years ago

Pericolo valanghe

Sun
Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

With fair weather comes the desire to get after it. However, there's some interesting things going on in the upper snowpack so listen to what it is telling you and continue to investigate for the existence of buried weak layers on the features you are riding. 

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    A number of days of sun and high freezing levels will likely wake up cornices. Avoid slopes with cornice hazard above. 

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2

    Weak, feathery crystals buried 30-50cm are producing isolated avalanches. This problem seems mainly isolated to sheltered treeline features, however, I would assume it exists in the alpine until proven otherwise. 

Confidence

Moderate -

Weather Forecast

Friday night: Mainly clear. No precipitation. Light winds from the north. -9°C in the alpine. 

Saturday: Mainly sunny. No precipitation. Light winds from the north. A low of -9°C and a high of +3°C in the alpine. Freezing levels rising to 1400m. 

Sunday: Mainly sunny. No precipitation. Moderate winds from the north. A low of -5°C and a high of +3°C. Freezing levels rising above 2000m. 

Monday: Mainly sunny. No precipitation. Light winds from the north. A low of -5°C and a high of +2°C. Freezing levels at 1500m. 

Avalanche Summary

There have been isolated, skier reactive slab avalanches to size 1.5 reported on weak, feathery surface hoar crystals buried 25-50cm at treeline and in the lower alpine. 

A professional operation reported a slab avalanche being triggered by a wet loose avalanche from above on Thursday. 

Snowpack Summary

There's a lot going on in the upper snowpack. Careful assessment is recommended. 

There is now a crust on the surface at lower elevations and on solar aspects at treeline.

Feathery, weak surface hoar crystals buried around February 26th are now found down 25-50cm most prominently at treeline elevations. There have been reports of this layer being reactive to skier traffic. 

A thick crust buried in mid-February is now found down 60-100cm. Though there has been little avalanche activity reported on this layer, it should be treated with suspicion. 

The lower snowpack is effectively bridged by the layers above and we do not expect avalanches to be triggered in the lower snowpack at this time. 

Terrain and Travel

  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Surface hoar distribution is highly variable. Avoid generalizing your observations.
  • Avoid travelling on slopes below cornices.
  • Firm cornices can pull back into flat terrain at ridgetop if they fail.

Regioni coperte