Avalanche Forecast
Issued: Feb 10th, 2021 3:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
jcoulter,
Avalanche Canada
Wind and extreme cold is not a fun combo! Be mindful of wind loaded features and use a conservative mindset when planning objectives in these temperatures.
Summary
Confidence
Weather Forecast
WEDNESDAY NIGHT - Cold / light to moderate east wind / alpine high temperature near -30
THURSDAY - Still cold, but still sunny / light to moderate east wind / alpine high temperature near -24
FRIDAY - A mix of sun and cloud / light east wind / alpine high temperature near -17
SATURDAY - Cloudy, trace of snow, light south east wind / alpine high -13
Avalanche Summary
Suspect there is continued snow transport building slabs with the recent variable wind. A Feb 9th MIN observation shows some stiff wind affected snow over sugary facets.
Evidence of recent natural wind slab avalanches (likely occurring Saturday) were observed on Sunday as discussed in this MIN report. Small loose dry avalanches were also reported, in some cases likely triggered by the sun.
As the recent low-density snow becomes more consolidated and forms a slab, the likelihood of avalanches may increase.
Snowpack Summary
Cold temperatures are encouraging surface faceting and variable winds are impacting loose snow. The late January interface is down 30-50 cm, consisting of isolated surface hoar in sheltered locations, and previous wind effect in exposed areas. On solar aspects, a buried sun crust can be found below 1000 m.
The lower snowpack has two decomposing crust layers. The upper crust is 70-140 cm deep and continues to show occasional hard, sudden results in snow pits. The deeper crust at the bottom of the snowpack is more prevalent in shallow snowpack ranges. These deep persistent layers seem to be dormant under the current conditions, but shallow rocky slopes should still be carefully assessed and approached with caution.
Terrain and Travel
- Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
Problems
Wind Slabs
Variable wind may form reactive slabs on multiple aspects, and outflow winds continue to impact loose snow and reverse load features. Avalanches will be most likely in wind loaded areas and where the snow feels stiff or punchy. Be mindful of loose-snow or sluff in steeper features.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 11th, 2021 4:00PM
