Avalanche Forecast
Avalanche Bulletin - Jasper National Park
New snow available for transport may be enough to overload existing and lingering instabilities.
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Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use caution on open slopes and convex rolls
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Persistent slabs sit on facets on polar aspects (more reactive recently), and a hard melt-freeze crust on solar aspects. Use a cautious approach in open terrain and assess the bond at these interfaces carefully before committing to a slope.
Travel and Terrain Advice
- Watch for signs of instability such as whumpfing, or cracking.
Avalanche Problem 3: Cornices
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Cornices continue to grow with fresh snow and wind. Several failures were noted in the past week, in most cases triggering a slab below.
Travel and Terrain Advice
- Give cornices a wide berth when travelling on or below ridges.
- Minimize exposure during periods of loading from new snow and wind.
Avalanche Summary
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Active cornice failures reported earlier in the week have triggered persistent slabs below ridge-tops. Good travel and riding conditions through the bulletin region.
Snowpack Summary
Recent snow has been blown in to an isolated wind slab up to 30cm thick. This has added to the previous slab sitting on a sun-crust on solar aspects and facets on polar aspects - these are now buried as deep as 60cm. Underneath the variable slab in the upper snowpack, as well as in shallow areas, the snowpack is generally facetted and weak.
Weather Forecast
Arctic air remained entrenched over the Prairies for Friday. Light winds shifting to the SW have brought a warmer, moist air mass into the bulletin region. Saturday morning is forecasted for some light flurries with total snowfall of 6cm for the day. Freezing level rising to 2300m and seasonally warm temps; alpine temp 1c.
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New moist snow available for transport with incoming flurries. This will build on surface layers and may be enough to overload existing and lingering instabilities.