Large cornice failures are more likely during periods of hot and sunny weather. Use caution when traveling on corniced ridgetops and limit your exposure to slopes with large cornices overhead.
Lingering wind slabs may remain reactive on lee features in the alpine.
Lingering wind slabs may remain reactive on lee features in the alpine.
Use ridges or ribs to avoid areas of wind loaded snow.
Cornices may be weak and reactive to human triggers. They create a significant falling hazard, and can produce large slab avalanches as they fall onto the slope below.
Cornice failures are more likely during hot and sunny weather.
Small wet loose avalanches should be expected on steep, solar aspects when the sun comes out.
Avoid big, steep, alpine slopes that are getting cooked by the sun.
Friday night: Partly cloudy / Light west wind / Low of -4 / Freezing level 1200 m.
Saturday: Mix of sun and cloud / Light southwest wind / High of 4 / Freezing level 1800 m.
Sunday: Sunny in the morning, then increasing cloud throughout the day and 10-15 cm snow overnight ( rain below around 1200 m) / Moderate south wind / High of 3 / Freezing level 1700 m.
Monday: Cloudy / Moderate southwest wind / High of 2 / Freezing level 1500 m.
Several naturally triggered storm slab avalanches up to size 1.5 were reported on lee features in the alpine Thursday morning near Whistler.
We currently have very limited avalanche observation data from this region.
Please consider posting your observations to the Mountain Information Network (MIN). Photos of current conditions and avalanches are the most helpful.
Lingering wind slabs may remain reactive on lee features in the alpine.
The recent snow is sitting on a variety of hard snow surfaces, including crusts and wind scoured snow.
Below this, there are several crusts in the upper snowpack. In areas where there are weak facets sitting on top of the crusts, there is potential for large natural avalanches when freezing levels reach mountain tops for multiple days.
Avoid large slopes and avalanche paths during periods of intense warming.
Cornices are very large and more prone to failure during periods of intense warming.
