Avalanche Forecast
Regions: Little Yoho.
Continued natural avalanches are expected on solar aspects over the next 24-48 hours, and cornice failures may continue to trigger the deep persistent layer on the lee aspects. Continue to avoid large avalanche terrain features and avoid climbing in gullies with any exposure to the sun.
Confidence
Moderate
Avalanche Summary
No new avalanches have been reported in this region.
To the east in the weaker snowpack, a deep size 3 on Pilot Mountain, a large, deep size 3 on Puzzle Peak crossed the standard uptrack (solar triggered probably). Finally, a large natural avalanche in Kananaskis Country ran over some ice climbs on Mt. Kidd.
Snowpack Summary
3-day storm totals Sunshine 21 cm, Simpson, 13 cm, Stanley 12 cm, Bosworth 25 cm and Bow Summit 34 cm.
This new snow has fallen on a freshly buried (March 12) layer of surface hoar, facets and sun crust and in the next few days we will see how well it bonds. Generally, we expect the snowpack to settle well over the next few days as the storm snow finds its place. The basal facets are less pronounced in this region with deeper snowpack and will become less reactive over the next few days.
Weather Summary
Sunny skies are forecasted for Thursday with afternoon cloudy periods. Light morning N-NW winds will ease to very light westerly. Freezing levels between 1300 to 1500 m with alpine temperatures ranging between -10 to -15C. Friday & Saturday, clear skies continue, daytime freezing levels climb to 1800 m with warmer alpine temperatures ranging between -5 and -10 C.
For a more detailed forecast click here.
Terrain and Travel Advice
- Uncertainty is best managed through conservative terrain choices at this time.
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
Avalanche Problems
Storm Slabs
Surface snow from the past few days of storms will settle into a slab over a new weak layer buried on March 12. We are still gathering information on the status of this freshly buried weak layer. Additional observations will help determine whether we have a new persistent weak layer, or not and its distribution.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood: Possible - Likely
Expected Size: 1 - 2
Deep Persistent Slabs
With the forecasted solar input and warm temperatures, we may see more cornice failures and smaller avalanches triggering this deep layer. Give careful consideration to the slopes overhead, as large avalanches may run well into the runout zone or into lower-angle terrain. Avoid big terrain features and be especially cautious in thin or rocky areas, where triggering is more likely. The weak depth hoar at the bottom of the snowpack inspires little confidence and will continue to wake up with each new storm or warming event.
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Possible
Expected Size: 2 - 3.5
Persistent Slabs
Three persistent weak layers formed in January are down 60-110 cm. Buried sun crusts on steep solar slopes present the greatest concern for triggering, however, weak facets and isolated surface hoar can be found on the same interfaces on shaded aspects.
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Possible
Expected Size: 1.5 - 3