Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Likely
- Taille
- 1–2.5
Moderate SW winds and warming temps continue to add to the windslab problem.
Bulletin d’avalanche
Voir sur la carteJasper
Jan 9 – 10, 2019Parks Canada
Archivé · expiré 8 years ago
Danger d’avalanche
Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Points saillants
Large features without previous activity remain a concern, it is still possible to trigger very large avalanches.
Problèmes avalancheux
Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible
- Taille
- 1.5–3.5
The Dec. 11th layer of facets and surface hoar is buried more than a meter deep. This layer is strengthening but was active during the recent storm.
Deep Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible
- Taille
- 1.5–4
The base of the snowpack is weak and facetted in shallow areas and will likely be for some time. The new snow in combination with a skier has the potential to overload this weakness.
Weather Forecast
The ridge of high pressure is replaced as a Pacific low moves inland today, with warmer air and snow flurries for Wednesday and Thursday.Wednesday: Cloudy with flurries (up to 6cm accumulation). Alp High -4C, Low -6C. Moderate SW ridge wind, freezing level 1600m.A detailed mountain weather forecast is available from Avalanche Canada.
Snowpack Summary
Moderate winds building fresh windslabs at ridgetop. Up to 85cm of snow fell between Jan 2-4. This overlies previous widespread wind effect from strong to extreme SW winds (many exposed areas were scoured to ground). The Dec. 11th layer persists mid-snowpack. The basal snowpack is weak in shallow areas - many recent avalanches failed on the ground.
Avalanche Summary
Continued reports to the south of human and explosive triggered large avalanches.Jan 5th helicopter control produced numerous large-very large avalanches. One very large avalanche on Sunset pk. buried the Parkway and destroyed 10-20 hectares of mature timber.A natural cycle of numerous large to very large avalanches occurred Jan 3rd and 4th.