Wind Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–1.5
Recent snow has been redistributed by southwest wind in exposed alpine areas. The most suspect slopes are terrain features immediately adjacent to ridges.
Avalanche forecast
View on mapPurcells
Apr 17 – 18, 2019Avalanche Canada
Archived · expired 7 years ago
Avalanche danger
Fri
Sat
Alpine
2 · Moderate
Treeline
1 · Low
Below
1 · Low
Highlights
Isolated wind slabs may be found up high. The freezing level is expected to rise Thursday afternoon: continue to assess the surface snow and expect loose wet activity if the snow is moist or wet.
Avalanche problems
Loose Wet
NNEESESSWWNW- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–1.5
The snow surface will weaken rapidly with the freezing level rising to 2500 m and possibly some rain on Thursday. This will quickly increasing the likelihood of triggering loose wet avalanches.
Confidence
Moderate - Freezing levels are uncertain
Weather Forecast
WEDNESDAY NIGHT: Cloudy with isolated flurries, trace accumulation, moderate west wind, alpine temperature -3 C, freezing level 1900 m.
THURSDAY: Mix of sun and clouds with isolated flurries, accumulation trace to 5 cm, moderate southwest wind, alpine temperature -1 C, freezing level 1900 m rising to 2500 m.
FRIDAY: Cloudy with rain, accumulation 10 to 15 mm, light to moderate southwest wind, alpine temperature 1 C, freezing level 2500 m.
SATURDAY: Mix of sun and clouds with isolated flurries, light northwest wind, alpine temperature -4 C, freezing level 1900 m.
Avalanche Summary
Small loose wet avalanches were triggered during afternoon warming. Otherwise, no new avalanches were observed.
Snowpack Summary
Recent snowfall amounts are variable across the region, ranging from 10 to 30 cm, with the most on the west side of the region. This snow has remained dry in northerly alpine terrain. All other aspects and elevation bands will have either wet surface snow or a melt-freeze crust due to an increasing freezing level and heat from the sun. The snow may moisten on Thursday as the freezing level rises to 2500 m.
Weak and sugary faceted grains remain at the bottom of the snowpack in the alpine, producing a low likelihood but high consequence scenario. Steep, rocky areas with a shallow snowpack are the most likely places to trigger this layer.