Avalanche Forecast
Issued: Nov 16th, 2021 4:52PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Storm Slabs and Loose Dry.
Timothy Johnson,
Large avalanches have been occurring near ridge top.
The Icefields Parkway will be open in the morning from Jasper to Parker Ridge Parking Lot. The rest of the highway will remain closed until later in the afternoon. Check AB511 for updates.
Summary
Weather Forecast
Wednesday: Cloudy with sunny periods.
Alpine temperature: -12 C.
Ridge wind southwest: 10 km/h.
Thursday: A mix of sun and cloud.
Alpine temperature: Low -13 C, High -10 C.
Ridge wind southwest: 10 km/h.
Friday: Cloudy with sunny periods and isolated flurries.
Precipitation: Trace.
Alpine temperature: Low -15 C, High -9 C.
Ridge wind west: 10-30 km/h.
Snowpack Summary
Around 60cm of new snow at Parker Ridge in the past couple of days. Moderate to strong SW winds are building wind slabs in the alpine and exposed treeline. This new storm snow is sitting on a variable snowpack depending on aspect and elevation with a melt freeze crust up to around 2500m, weak faceted snow near the ground and old melt freeze crusts
Avalanche Summary
In the Parker Ridge area on Tuesday there were several avalanches near ridge top in a "thin to thick" snowpack and rocky terrain where wind had firmed up the new snow. These avalanches stepped down to ground. A large avalanche was caused by explosives in a similar terrain feature propagating over 800m wide.
Confidence
Due to the number and quality of field observations
Problems
Wind Slabs
Recent large avalanches were observed near ridge top where new snow was impacted by the wind.
- Use caution in lee areas. Recent wind loading have created wind slabs.
- Keep an eye out for reverse loading created by N-NE winds.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Storm Slabs
Storm slabs are settling down but use caution and dig down to test the snow before committing to a slope.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
Even small avalanches in exposed terrain can have high consequences.
- Be careful of loose dry power sluffing in steep, confined or exposed terrain.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Nov 17th, 2021 4:00PM
