Jasper National Park Avalanche Forecast
May 1st, 2019 4:21PM
The alpine rating is Persistent Slabs., the treeline rating is , and the below treeline rating is Known problems include
Winter still exists in Jasper! Good skiing can be found in the right locations.
Cold and snowy for the next few days, Wednesday night around 10cm with light westerly winds with alpine temps around -4. Thursday flurries with an alpine high of -2 with around 5-10cm of accumulation with freezing levels up to 2100m. Friday flurries with alpine temps -5 moderate winds with strong gusts from the west with freezing levels at 1800m.
5-15cm new low density snow overlies previous slabs built from N winds that may still be reactive in isolated alpine terrain where a crust is present. Buried facet layers remain a concern with small whumpfs and variable test results. Most concern is on protected northerly alpine features or where they sit on buried crusts.
A team in the Columbia Icefields on wednesday did not observe any new avalanches. To the South of our region (Bow Summit), 2 large (size 2 - 2.5) persistent slabs were remotely triggered on alpine SW aspects Tuesday. On Sunday, 1 Large (size 2.5) Persistent slab was observed in the Maligne Range on an East aspect, in convex alpine terrain.
The two main concerns for persistent slabs are: Recent slabs from northerly winds. Especially steep solar terrain where a prominent sun crust would be. Next the concern for a midpack facet weakness in sheltered upper treeline and alpine features.
- Watch for signs of instability such as recent avalanche activity, and whumpfing/cracking underfoot.
- Carefully evaluate big terrain features by digging and testing on adjacent, safe slopes.
Valid until: May 2nd, 2019 4:00PM