Avalanche Forecast
Issued: Jan 9th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
jleblanc,
Avalanche Canada
Dangerous avalanche conditions exist.
Make conservative terrain choices by choosing low-angle slopes and avoid overhead hazards.
Summary
Confidence
Moderate
Avalanche Summary
A skier accidentally triggered a small storm slab on south-west alpine lee feature near Blackcomb. Numerous size 1 wind/storm slabs were also human-triggered on steep terrain at treelien and above near Whistler. Limited travel and visibility in the mountains prevented recording more activity. The likelihood of avalanches will increase with the arrival of the forecast weather.
Snowpack Summary
Up to 35 cm of new snow has fallen into the region since the weekend. Ongoing southerly and previous northerly winds have affected the storm snow in any open terrain and near ridgelines. On sheltered slopes, up to 60 cm of powder storm snow can be found. Snow is heavy and moist at lower elevations.
A thick widespread crust formed in late December is down 40 to 70 cm. In the alpine, it is thin and breakable. Professionals are concerned that small avalanches may run down to this crust and create larger-than-expected avalanches.
Near the base of the snowpack, a weak facet/crust layer from mid-November can be found and remains a concern. In general, the snowpack is weak, faceted, and shallow.
Weather Summary
A frontal band will generate periods of moderate snowfalls Monday night. Overcast skies and dry conditions are expected by midday Tuesday. A deeper system is expected to push heavier snowfalls into the region late evening Wednesday.
Monday night
Stormy 10-15 cm, moderate southerly winds gusting 60 km/h, freezing levels around 1200 m, low of -4C at treeline.
Tuesday
Stormy 5-10 cm ending by midday, moderate southeasterly winds gusting 45 km/h, freezing levels rising to 1500 m, high of +1C at treeline.
Wednesday
Snow 5-10 cm starting midday at higher elevations, moderate southerly winds gusting 45 km/h, freezing levels around 1200 m, high of -2C at treeline.
Thursday
15-25 mm of wet snow/rain, moderate southerly winds gusting 60 km/h, freezing levels around 1800 m, high of 0C at treeline.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.
- Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
Problems
Storm Slabs
Strong southerly winds and additional overnight snowfalls will create touchy fresh slabs. Storm slabs may be most reactive where wind has loaded deep deposits into leeward terrain features in the alpine and treeline. Be aware that slab avalanches could step down to deeper layers and produce larger-than-expected avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 10th, 2023 4:00PM
