Avalanche Forecast
Avalanche Bulletin - Jasper National Park
The avalanche cycle will start early and continue late into the evening.
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Conditions are Extreme. Avoid backcountry: stick to ski resorts or trackset cross country trails.
- If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
With warm temperatures and solar radiation these events are likely to increase over the next few days from all aspects in the sun. Good triggers are falling sections of cornices. These events can run far into the valley below
Travel and Terrain Advice
- Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
Avalanche Problem 3: Cornices
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
All cornices should be considered unstable a this time. Stay away from them and away from terrain below them. Rising temperatures are causing cornices to fall triggering slopes below. Give them a wide berth.
Travel and Terrain Advice
- Avoid steep slopes below cornices.
- Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.
Avalanche Summary
The spring avalanche cycle will be in full swing over the next few days. Large and destructive avalanche can be expected from all elevations and running far into the valley bottom. Without an overnight freeze forecasted these events will start early, perhaps before midday. Explosive results on thursday produced numerous avalanche to size 2.5.
Snowpack Summary
Moist snow extends to treeline on all but the most Northerly slopes. On Southerly slopes this continues into the alpine. Persistent slabs can be found on most aspects at treeline and above. These have been reactive to large triggers like cornice failures. Below 1,900m the snowpack is going isothermal on a daily basis.
Weather Forecast
Very warm temperatures are forecasted with freezing levels extending high into the alpine, 3,700m. Virtually no overnight recovery of the snowpack is expected once out of the valley bottom. An inversion may make for better AM travel in the valley bottom. Pack your sun block.
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No overnight crust formation is expected at treeline and above. With most of the snowpack below 1,900m being isothermal expect these avalanches to start early on solar slopes at all elevations.