Avalanche Forecast
Issued: Jan 19th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Deep Persistent Slabs and Persistent Slabs.
Mikey,
Avalanche Canada
Despite the MODERATE hazard rating, conservative terrain selection is still recommended. A disciplined approach is required for a very slowly changing weak snowpack.
Summary
Confidence
Avalanche Summary
Nothin new today.
Snowpack Summary
A very thin crust exists just below the snow surface, but thankfully this crust disappears above 2000m. A buried layer of surface hoar down 15 to 30cm at treeline continues to produce shears, but the main concern in the snowpack is the persistent moderate shears failing down 70 to 80cm in the mid-November facets. Despite these layers gaining a bit of strength, the lower half of the snowpack remains very weak, and any avalanche initiated in the upper snowpack will likely step down to the lower weaknesses. Thin and rocky areas are of particular concern for triggering the deeper weak layers. Below 2100m the snowpack does not support the weight of a skier if you leave an established skin track.
Weather Summary
Expect a mix of sun and cloud on Friday. Temperatures will between -9c and -14c, along with moderate NW winds.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
- Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
Problems
Deep Persistent Slabs
Snowpack tests continue to indicate that human triggering of the deeper weak layers is a real possibility. Shallow rocky areas are particularly susceptible.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
If triggered the persistent slab is very likely to step down to the deeper instability and involve the entire winter's snowpack. Pay close attention at treeline where this layer is more commonly found.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 20th, 2023 4:00PM
