Avalanche Forecast
Issued: Apr 5th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Loose Wet, Storm Slabs and Cornices.
swerner,
Avalanche Canada
Start and finish your day early. Warm temperature and sunshine will increase the likelihood of avalanche activity, especially on steep slopes that are baking in the sun.
A conservative approach to terrain is a great way to ease into your day while assessing along the way.
Summary
Confidence
Moderate - Uncertainty is due to the timing or intensity of solar radiation and its effect on the snowpack.
Weather Forecast
Wednesday: A mix of sun and cloud with strong solar input and light ridgetop wind light from the southwest. Freezing level 1400 m and alpine temperatures near -6 C.Â
Thursday: WARM. Freezing levels rise to 2500 m by the afternoon. Alpine temperatures +3C and ridgetop wind moderate from the southwest. No overnight refreeze.
Friday: Cloudy and warm with up to 10 cm of new snow. Freezing levels remain near 2500 m with alpine temperatures near +3C. Freezing levels should drop to 1400 m by Saturday with alpine temperatures near -10 C.
Avalanche Summary
On Monday, numerous natural and rider-triggered wind and storm slabs up to size 2 were reported. Some dry loose avalanches were also seen from steep terrain features up to size 1. Â
Avalanche activity will likely increase when the sun comes out Wednesday, especially on southerly slopes. Be aware of overhead hazards like failing cornices and big avalanche paths that are facing the sunshine.Â
Snowpack Summary
Up to 25 cm of new storm snow fell at upper elevations. Strong west to southwest wind will be redistributing the new storm snow in exposed high elevation terrain forming touchy wind slabs and developing large cornices. The upper 60 cm of the snowpack consists of multiple buried crusts.Â
The new snow brings 40-70 cm of snow above the late March melt-freeze crust and tapers rapidly at lower elevations. This crust is present up to 1900 m on all aspects.Â
Wednesdays' sun and warming will likely create moist/ wet surface snow on all aspects up to 1500 m and to the mountain top on southerly slopes.Â
Terrain and Travel
- Watch for changing conditions today, storm slabs may become increasingly reactive.
- If triggered loose wet avalanches may step down to deeper layers resulting in larger avalanches.
- Cornices become weak with daytime heating or solar exposure.
- Adjust your travel plans accordingly to the changing conditions of elevation and time of day.
Problems
Loose Wet
Sun and warm temperatures will weaken the snow surface on sun-exposed slopes, creating wet avalanches. Watch for wet and heavy snow and be aware of overhead exposure to big sunny slopes.
Wet loose avalanches could trigger deeper wet slabs.
Aspects: East, South East, South, South West, West.
Elevations: All elevations.
Likelihood
Expected Size
Storm Slabs
Up to 25 cm of new storm snow has accumulated throughout the region building fresh storm slabs. The slabs will be most reactive where they overlie a crust and when the sun comes out.
Moderate to strong southwest wind has redistributed the new snow forming wind slabs in lee terrain features in the alpine and at treeline.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
Springtime cornices are large and unpredictable. The sunshine can pack a punch and lead to cornice failures. Give them a wide berth when travelling at ridge crest and avoid overhead exposure.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 6th, 2022 4:00PM
