Avalanche Forecast
Avalanche Bulletin - Jasper National Park
The avalanche danger will rise on Monday as the freezing level rises to 3500m.
Avalanche Problem 1: Loose Dry
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.
Avalanche Problem 2: Deep Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Solar triggering is possible on steep south facing slopes.
Travel and Terrain Advice
- Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
Avalanche Summary
No patrol occurred on Saturday and nothing new was reported. A helicopter flight on Thursday observed numerous dry loose avalanches, size 1-2, along the Icefields Parkway and Maligne Lake Road on steep solar aspects, running to treeline. One size 3 slab avalanche was noted on a steep South facing slope that ran on the Halloween Crust to treeline.
Snowpack Summary
Melt freeze crust on steep solar aspects treeline and above. There is a well settled snowpack in most locations. A 30 - 70 cm thick slab overlies a crust and bonding appears to be strengthening at this interface. The Halloween Oct 31 crust sits near the bottom of the snowpack from treeline to 2700 m.
Weather Forecast
Strong Westerly winds beginning overnight and continuing through the day. Freezing level 1600m. Alpine temperature -4 . Starting Sunday evening, the temperature will rise through the day on Monday with the freezing level reaching 3500m. Temperatures cool on Tuesday. No precipitation is expected......
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Solar triggering of loose avalanches may occur in steep terrain. The entraining snow may have enough volume to knock ice climbers off or bury you in a terrain trap. Reactivity increases with afternoon sun.