Avalanche Forecast
Avalanche Bulletin - Jasper National Park
Be mindful of solar radiation, even on partly cloudy days.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Best conditions on sheltered northerly aspects.
Avalanche Problem 2: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Watch for snowpack to become reactive if the sun comes out.
Travel and Terrain Advice
- Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.
- Avoid ice climbs exposed to steep rocky terrain on solar aspects during the middle of the day.
Avalanche Summary
Road patrol Tuesday noted loose wet avalanches to size one below treeline. An isolated loose, dry avalanche that ran size 2 was observed from steep terrain at 2400m on a shaded aspect near Parker Ridge and a field team triggered a size 1.5 windslab avalanche on moderate terrain on Mt. Kitchener at 3100m (60m wide, 60m long, 20-40cm deep crown).
Snowpack Summary
10-15cm of dense snow with moderate winds this week has created windslabs in lee features treeline and above. These windslabs are reactive on cooler, shaded aspects where they formed on a faceted surface. Loose wet slides are occurring below treeline in the late afternoon (particularly with direct sun) due to an increasingly isothermal snowpack.
Weather Forecast
Chance of an upslope storm on Thur evening with warmer temps and winds from the SE. Tonight freezing level to valley bottom. Wednesday cloudy with sunny periods and isolated flurries. Freezing level: 1800 m. Alpine high -1 C. Ridge wind south: 10-25 km/h. Warmer on Thursday with up to up to 10cm overnight and into Friday.
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Windslabs sit on a hard melt-freeze crust on solar aspects, and facets on polar aspects. Shaded slopes have been more reactive. Assess the bond at these interfaces carefully before committing to avalanche start zones.