Cornices
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible - Likely
- Taille
- 3–7
Cornices are expected to become weak with continued warm temperatures and solar radiation.
Bulletin d’avalanche
Voir sur la carteNorthwest Coastal
Feb 3 – 5, 2012Avalanche Canada
Archivé · expiré 15 years ago
Danger d’avalanche
Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Points saillants
Warm temperatures in alpine areas could cause large, unexpected avalanches, especially on south-facing slopes.
Problèmes avalancheux
Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Likely
- Taille
- 2–6
Rain and warm temperatures have promoted recent avalanche activity at low elevations that has run on a layer of facets buried around 20-Jan. This problem may creep higher in elevation with continued warm alpine temperatures.
Storm Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Likely
- Taille
- 3–7
Recent rain and warm temperatures have promoted avalanche activity on storm slabs. Alpine temperatures are expected to remain high and this problem is expected to continue through the forecast period.
Confidence
Fair - Freezing levels are uncertain
Weather Forecast
Saturday and Sunday: Dry or very light flurries, with alpine temperatures around -2C. Winds expected to be light southwesterly rising to moderate southeasterly. Monday: Clear with sunny spells. Temperatures below freezing at low elevations but alpine areas may see inversion conditions that will elevate temperatures to near zero.
Avalanche Summary
On Friday, slab avalanches up to size 3.5 were reported in response initially to rain and then during the day to intense solar radiation. On Thursday, numerous large (up to size 3) slab avalanches were reported out of lee terrain (SW predominantly) along Bear Pass during the warming period as the snow turned to rain. Lower elevations were especially active.
Snowpack Summary
Total snowpack depths pushing 5m at treeline are at new record levels for this time of year. Recent warm temperatures helped settle storm snow into a touchy surface slab at lower elevations. Other weaknesses can be found within the upper snowpack and the Jan. 20th facets down around 150cm. These create the potential for large step-down avalanches, but things seem to be settling rapidly. Strong winds associated with recent storms means large weak wind slabs and cornices on lee and cross-loaded terrain. Most snowpack concerns are limited to the surface layers. However, large triggers such as cornice falls and smaller avalanches stepping-down could affect deeper weaknesses.