Issued: Apr 5th, 2023 4:00PM
The alpine rating is Deep Persistent Slabs., the treeline rating is , and the below treeline rating is Known problems include
Continually assess your local conditions. Periods of intense sun can quickly destabilize the surface snow.
A few skier-triggered storm or wind slab avalanches were triggered on Tuesday. All were relatively thin (10 -20 cm), occurring along exposed ridge features in the western Purcells.
On Sunday a size 3 naturally triggered, deep persistent slab avalanche was reported in the western Purcells (southwest of Panorama). It occurred in large alpine terrain, west facing at 2800 m.
On Friday a size 3 naturally triggered avalanche was reported in the Dogtooth Range. While the failure plane is unknown the report mentions impressive propagation.
Dry, powder snow remains on shaded (northerly) slopes. While moist snow or thin crusts exist on most solar slopes at all elevations.
The mid-snowpack may still contain a number of weak layers, primarily in sheltered treeline terrain. However, no recent avalanche activity has occurred on these layers suggesting the layers are likely no longer a primary concern.
The lower snowpack includes a widespread layer of large, weak facets and or depth hoar crystals. This weak layer continues to be responsible for several very large and destructive avalanches throughout the season.
Mostly clear, with cloudy periods. Light southwest ridgetop wind. Alpine temperatures -5 to -10 C. Freezing level at valley bottom.
Mix of sun and cloud. Light southwest ridgetop wind. Alpine temperatures 0 to -5 C. Freezing level 2000 m.
Mostly cloudy, with scattered flurries and trace accumulation. Light to moderate southwest ridgetop wind. Alpine temperatures 0 to -5 C. Freezing level 2100 m.
Mostly cloudy, with scattered flurries and trace accumulation. Light to moderate southwest ridgetop wind. Alpine temperatures 0 to -5 C. Freezing level 1900 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
- Back off slopes as the surface becomes moist or wet with rising temperatures.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
Deep Persistent Slabs
The base of the snowpack remains very weak. Avoid thin, rocky start zones and shallow areas with variable snowpack depths.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Valid until: Apr 6th, 2023 4:00PM