Avalanche Forecast
Avalanche Bulletin - Little Yoho
Avalanche control will take place on Mts Hector, Bosworth, and Stephen. Overnight recoveries are not expected to be sufficient in many or most locations. Avoid early moist snow, isothermal pockets, sunny locations, and overhead hazard.
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Watch for clues, like sluffing off of cliffs, that the snowpack is warming up.
- Use extra caution on slopes if the snow is moist or wet.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
A few deeper avalanches have occurred in the last few days. Some stepped down to the March 15 crust. On shaded aspects these were likely sliding on facets formed at the same interface. This will wake up again with intense heating or large triggers.
Travel and Terrain Advice
- Avoid shallow snowpack areas where triggering is more likely.
- Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.
Avalanche Problem 3: Cornices
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Cornice failures are occurring on a regular basis now with warm temperatures and intense solar inputs. These large triggers have caused failures on the persistent weak layers deeper in the snow pack in a few places in the last couple days.
Travel and Terrain Advice
- Minimize exposure to overhead hazard from cornices.
- Cornices become weak with daytime heating, so travel early on exposed slopes.
Avalanche Summary
Ongoing wet snow avalanches are occurring in the afternoons. These vary by aspect and elevation but can get larger as they slop into low elevation isothermal pockets.
Snowpack Summary
Isolated wind slabs are present in the alpine. Crust or moist snow on all solar aspects depending on temperatures. Buried temperature crusts to 2000m on all aspects and to ridge top on solar slopes, including the Mar 15 crust down 40-70 cm in the alpine. Moist snow at lower elevations, with the entire snowpack becoming moist near valley bottom.
Weather Forecast
Thursday and Friday look to be warm with ~ 3500m freezing levels, light winds and weak overnight freezes.
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Loose wet avalanches are expected to be common over the next couple of days until overnight freezes return. Be aware of sun, early soft snow, and the slopes above you. Even small wet avalanches hurt.