Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
Increasing westerly winds will continue to build slabs in lee areas at treeline and in the alpine.
Avalanche forecast
View on mapWaterton Lakes
Dec 10 – 13, 2019Parks Canada
Archived · expired 7 years ago
Avalanche danger
Wed
Thu
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
Highlights
Increasing winds will continue to build slabs in the alpine and treeline. Approach wind affected terrain with care.
Avalanche problems
Persistent Slabs
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely
- Size
- 2–3
A combination of melt freeze crusts and facets from early season snowfalls is lurking at the bottom of the snowpack. These layers are unlikely to be triggered by people but smaller avalanches in the recent storm snow have been stepping down.
Weather Forecast
Tuesday: Cloudy with isolated flurries and an inversion with alpine highs of -2. Moderate to strong west winds.
Wednesday: Cloudy with isolated flurries with inversion breaking down and an alpine high of -7. Moderate west winds reaching strong to extreme overnight.
Thursday: Cloudy with flurries, alpine high of -5. and strong west winds.
Snowpack Summary
15-25cm storm snow coupled with moderate west winds has formed new slabs in the alpine. This overlies previous windslabs and a crust below 1800m. A melt freeze crust facet combo formed at the start of the season sits at the bottom of the snowpack. Though unlikely to be triggered by people, we have seen other avalanches stepping down to this layer.
Avalanche Summary
Saturday night's snowfall brought enough snow and wind to trigger a limited avalanche cycle in lee alpine terrain along the Akamina Parkway. In two cases these stepped down to early season weak layers on east aspects in the alpine. No new avalanches observed in the less snowy front ranges.
Confidence
Due to the number and quality of field observations