Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Unlikely - Possible
- Taille
- 1–2
Strong outflow winds may cause reverse loading. Use extra caution as you transition into wind affected terrain.
Bulletin d’avalanche
Voir sur la carteNorthwest Coastal
Feb 26 – 27, 2015Avalanche Canada
Archivé · expiré 12 years ago
Danger d’avalanche
Sat
Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
Points saillants
Use increased caution on sun exposed slopes during the afternoon warming.Are you a member of Avalanche Canada? Join today at avalanche.ca/membership
Problèmes avalancheux
Deep Persistent Slabs
NNEESESSWWNW- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Unlikely
- Taille
- 3–5
This is a very low probability problem with large consequences. A weak basal layer resulted in several full depth avalanches during the last sunny period which could be repeated this weekend. Avoid steep sun exposed slopes during the afternoon.
Confidence
Fair - Timing or intensity of solar radiation is uncertain
Weather Forecast
The ridge of high pressure rebuilds on Friday resulting in dry and sunny conditions for the next three days. On Friday, freezing levels should reach around 800m and alpine winds should be moderate-to-strong from the NE. On Saturday, the lower freezing level may reach around 1000m. However, an inversion may form and there is the potential for a layer of warm air to sit at alpine elevations. Alpine winds are forecast to remain moderate-to-strong. Conditions should be much the same on Sunday.
Avalanche Summary
On Tuesday, an explosive-triggered size 1 wind slab avalanche was reported. On Monday, numerous wet releases up to Size 2 were reported from steep sun-exposed slopes. Isolated cornice failures and ice falls were reported during the last sunny period. Last week several full-depth avalanches up to Size 3 were observed on all but North aspects. As we get increased sun and warming heading into the weekend, these types of avalanches could once again become a problem.
Snowpack Summary
A dusting of new snow may have buried the previously variable snow surface which may have included wind-pressed surfaces or old wind slabs, a sun crust or old rain crust, surface hoar, and/or surface facets. A layer of surface hoar buried in the upper snowpack has been reported in some areas and is worth investigating before committing to any big alpine terrain. At the base of the snowpack, weak facets may be persisting.