Avalanches have the potential to run far in certain terrain. Stick to low angle slopes and avoid terrain traps such as gullies.
Confidence
Moderate - Timing or intensity of solar radiation is uncertain
Weather Forecast
Weather models disagree on the outlook for Thursday. It will be either mostly sunny, or totally overcast with light flurries in the afternoon. Winds will be moderate from the west and ridge-top temperatures will climb to -5 by afternoon. Temperatures will be get progressively warmer through the week.
Avalanche Summary
Widespread loose dry avalanches up to size 1.5 in Alpine areas of the Eastern Ranges due to the recent fresh snow. There has also been very isolated thin wind slab activity up to size 1.5 in Alpine and Treeline terrain. Further west, there was little to no avalanche activity observed.
Snowpack Summary
An upslope storm deposited only 10 to 15cm along the Continental divide, with as much as 25cm in the Front Ranges closer to Canmore. This new snow overlies a variety of previous surfaces including sun crust, wind slab, breakable wind crust, sastrugi and facets. A couple of reports today of very poor quality skiing in the Spray. No change to the mid-pack and basal layers - they are still primarily weak and facetted and only have some residual strength in the deeper snowpack areas. Expect occasional ski penetration to ground, especially at lower elevations.
Problems
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
Deep Persistent Slabs
Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.
Loose Dry
Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.