Avalanche Forecast
Issued: Mar 2nd, 2024 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Persistent Slabs.
wlewis,
Avalanche Canada
Despite reduced danger ratings and natural activity, dangerous avalanche conditions still exist
Stick to very conservative terrain, avoid exposure to large slopes or overhead hazard
Summary
Confidence
Moderate
Avalanche Summary
On Friday explosive control and riders triggered slabs up to size 2.5, 40-100 cm deep. Storm snow remains reactive to human triggers, check out this MIN for more details.
Numerous large, remotely triggered avalanches have occurred throughout this storm, most recently reported on Thursday to size 3.
Observations are limited as operators are very cautious about stepping into avalanche terrain. We expect natural activity has tapered but human triggering remains likely.
Snowpack Summary
Storm totals vary from 50-120 cm throughout the Sea to Sky corridor. Strong south/west winds have created deeper slabs on north and east facing slopes.
Multiple weak layers exist in the upper and mid snowpack. The most concerning layer is buried 50-120 cm deep, with a layer of facets (or in sheltered areas, preserved surface hoar) above a crust. This layer is likely most concerning at treeline.
This layer continues to be sensitive to human triggers, producing large and remotely triggered avalanches from low-angle terrain, indicating the need for cautious decision making. This snowpack will take time to begin to settle and bond, with the significant new load of storm snow adding stress to these weak layers.
Weather Summary
Saturday Night
Cloudy with flurries delivering up to 5 cm of snow. 20-30 km/h southerlywinds. Freezing level drops to sea level.
Sunday
Mostly cloudy with isolated flurries. 20-30 km/h southeast winds. Treeline temperature -7 °C. Freezing level around 800 m.
Monday
5-15 cm of snow is possible by Monday morning.
Cloudy with flurries in the morning with clearing skies and sunshine in the afternoon. 10-20 km/hr southwest winds. Treeline temperature -10 °C. Freezing level around 500 m.
Tuesday
Mostly clear skies. 30-40 km/h northwest winds. Treeline temperature -10 °C. Freezing level around 500 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
- Remote triggering is a concern, avoid terrain where triggering slopes from below is possible
- Brief periods of sun could quickly initiate natural avalanche activity.
- Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.
Problems
Storm Slabs
Deeper and more sensitive slabs exist on north and east facing slopes near ridges. Danger may rise quickly if the sun appears.
Good travel habits are key, minimize your exposure to avalanche terrain and evaluate safe spots with caution.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Facets/surface hoar above a crust is most concerning at treeline elevations. Storm slab avalanches may step down to this layer resulting in very large, destructive avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Mar 3rd, 2024 4:00PM
