Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Buried old wind slabs (persistent slab) vary in reactivity and warrant a site by site assessment.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Approach steep lee and cross-loaded slopes with caution.
- Be careful with wind loaded pockets while approaching and climbing ice routes.
Avalanche Problem 2: Loose Dry
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
New snow covers a facetted/weak upper snowpack in sheltered areas. Be cautious in very steep terrain and in confined features where a small sluff could build mass.
Travel and Terrain Advice
- Use caution above ledges and cliffs where small avalanches may have severe consequences.
- The shallow, weakening snowpack makes for difficult trail breaking at low elevations.
Avalanche Summary
No new avalanches observed or reported.
Snowpack Summary
Up to 15cm of snow (3 days), sits on pockets of old wind slab in exposed areas (these sit on weak facets and srfce hoar many locations), and a facetted upper snowpack in sheltered areas at all elevations. A strong mid snowpack crust is providing some strength around treeline. The faceting process (weakening) is well underway in the lower snowpack.
Weather Forecast
An arctic front has pushed the jet stream to our south. Cold air and L winds will persist through Thursday.
Thursdays forecast is for a mix of sun and cloud, alpine lows -18C, highs -14 C, and light wind.
A ridge sliding in from the Coast will give warming temps and light W winds in to the weekend.
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New snow covers pockets of old wind slabs on a weak interface in exposed alpine and TL features. Bigger, uniform features have the potential to trigger large avalanches and should be treated with caution.