Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible - Likely
- Size
- 1–2
Southwest winds have created wind slabs in the alpine and tree line.
Avalanche forecast
View on mapJasper
Feb 18 – 19, 2023Avalanche Canada
Archived · expired 4 years ago
Avalanche danger
Mon
Tue
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
1 · Low
Highlights
Expect avalanche hazard to rise on Sunday with incoming weather. Stay vigilant in regards to the deep persistent slab problem.
Avalanche problems
Deep Persistent Slabs
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1.5–3
The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Large natural and explosive triggered avalanches in the last couple of days have run on this layer.
Confidence
Moderate
Avalanche Summary
Two large avalanches noted in the Maligne and Churchill Ranges in the alpine on east facing slopes on Wednesday. No Patrol on Friday.
Don't forget to post avalanche observations to the MIN.
Snowpack Summary
Recent strong to extreme winds stripping exposed features and building wind slabs in the alpine and at tree line. In sheltered locations 30cm of low density snow lies over a generally weak mid and bottom snowpack with facets and depth hoar at the base. The height of snow is variable from 50 to 150cm.
Weather Summary
Saturday
Cloudy with sunny periods and isolated flurries.
Precipitation: Trace.
Alpine temperature: High -8 °C.
Ridge wind west: 15-35 km/h.
Freezing level at valley bottom.
Sunday
Flurries.
Accumulation: 11 cm.
Alpine temperature: Low -10 °C, High -6 °C.
Ridge wind west: 20 km/h gusting to 50 km/h.
Freezing level at valley bottom.
Detailed weather forecasts from Avalanche Canada: https://avalanche.ca/weather/forecast
Terrain and Travel Advice
- Expect slab conditions to change drastically as you move into wind exposed terrain.
- Keep in mind that human triggering potential persists as natural avalanching tapers off.