Avalanche Forecast
Avalanche Bulletin - Jasper National Park
The likelyhood of natural triggering has decreased with cool temps. Preserved weaknesses in the mid snowpack still warrant a cautious approach in some areas, particularly at treeline.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use conservative route selection, choose moderate angled and supported terrain with low consequence.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
10-15cm of new snow that arrived Saturday and Sunday is being redistributed by light to moderate NW winds. This new snow may also be hiding older stiffer windslabs from last weeks heavy snow and strong SW winds.
Travel and Terrain Advice
- Be cautious as you transition into wind affected terrain.
- If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.
Avalanche Problem 3: Loose Dry
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
The new snow that fell Saturday and Sunday has triggered a few slabs as it has sluffed off of rock faces or steep terrain. Consider the potential for this if you enter steep or confined terrain such as ice climbs.
Travel and Terrain Advice
- Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.
Avalanche Summary
A good look around today with clear skies. Saw two naturals in the Maligne area in the morning. A few notable avalanches seen through the tenure most of which were at least 48 hrs old; generally windslabs in the alpine to sz 2.5 and a few persistent slabs in the low alpine.
Snowpack Summary
15 cm of new snow arrived last weekend with light N winds. This sits over previous wind slabs formed by 40cm of snow pushed around mainly by strong SW winds. Mid-pack persistent weak layers, mainly preserved Jan 7 surface hoar down 40 to 60cm and the rotten Dec 15 facets sitting just below are still a concern but remain stubborn to triggering.
Weather Forecast
Arctic air will dominate with few clouds, light winds, highs near -10 and lows near -20C. Warm, wet, pacific air is forecast to over-ride the arctic air Wednesday morning. This system may bring up to 25mm of precip with moderate winds and temperatures nearing -5C.
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Field teams observed whumpfing and moderate test results Sunday and Monday in sheltered zones around treeline on these layers. Shallow areas seem to be the areas to watch in the alpine.