Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Ongoing snowfall will cause the hazard to build through out the day. It might be a good idea to finish your objective early.
Avalanche Problem 1: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- The new snow will require several days to settle and stabilize.
- Minimize overhead exposure during periods of heavy loading from new snow, wind.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
This problem is made up of 3 significant interfaces in upper snowpack. Incoming new snow may overload these layers, which have recently been reactive to skier testing and explosive control work, producing a few very significant results.
Travel and Terrain Advice
- Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
- Avoid steep convexities or areas with a thin or variable snowpack.
Avalanche Problem 3: Loose Dry
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Watch for sluffing in steep terrain.
Travel and Terrain Advice
- Be cautious with gully features.
Avalanche Summary
Avalanche control on Parkers Ridge Friday produced 2 large avalanches, size 2 and 2.5 on a N aspect running as the the persistent slab. On the 18th of 18 shots placed, a large crown appeared up to 1.5m thick x 150m long x 300m wide - interesting display of the variability in sensitivity and spacial distribution of buried weaknesses.
Snowpack Summary
Incoming new snow is building fresh storm slabs and is falling on a persistent slab made up of 3 weak interfaces in the top 30 to 50cm of the snowpack. Depth and distribution of these weak surface hoar/facet layers varies within the terrain; although buried surface hoar has consistently been found in sheltered features at TL.
Weather Forecast
An Atmospheric River is hitting the South Coast and giving moderate precip as far inland as Jasper.
Monday: Snow, 20 cm, High -3 C Low -9 C, light gusting strong SW wind, Freezing level 1700 meters.
Tuesday: Flurries, 6 cm, Low -10 C, High -6 C, Light gusting moderate W wind.
Wed: Cloudy with sunny periods, Low -16 C, High -10 C, light W wind.
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Incoming new snow and wind will build fresh storm slabs. If triggered these may step down and trigger the persistent weaknesses in the upper snowpack.