Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Avalanche control work today on Parker Ridge today confirmed that triggering a large slab with a light load is quite possible. With isolated natural activity observed today as well, it is clear that the stakes are starting to rise...
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Watch for whumpfing, hollow sounds, and shooting cracks.
- Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Last week's storm snow with southwesterly winds has built soft slabs in open features. These were reactive Thursday, failing as small sluffs out of cliff terrain hit the slope.
Travel and Terrain Advice
- Be cautious as you transition into wind affected terrain.
- Be careful with wind loaded pockets while approaching and climbing ice routes.
Avalanche Summary
Natural windslab avalanches up to size 1.5 were observed Tuesday in windswept alpine moraine features. These events appeared to be running on the persistent slab interface down 30 to 50cm.
Snowpack Summary
Persistent slabs sit above 3 weak interfaces in the top 30 to 50cm of the snowpack. Depth and distribution of these weak surface hoar/facet layers varies with the terrain and vegetation shelter, but they are consistently found in sheltered features at TL and above. Windslabs have developed in open areas TL.
Weather Forecast
Saturday will see continued cool temps with cloud and the potential for light flurries. On Sunday a SW flow will bring 5-10cm of precipitation with winds increasing to moderate SW and temperatures rising into the -10C range.. Significant snow may arrive Monday as temps peak at -5 C in the alpine.
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This problem is made up of 3 significant interfaces in the top 30-50cm of the snowpack and deeper in isolated wind loaded locations. These slabs have been active to skier testing and explosive control work producing a few very significant results.