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Avalanche Forecast

Archived

Feb 24th, 2013–Feb 25th, 2013

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

The timing and volume of snowfall will determine if the avalanche danger increases to considerable in the next few days.

Weather Forecast

Snow should come in light flurries over the next few days with snowfall up to 15cm Monday afternoon. However, it will come with strong westerly winds up to 100 Km/h at ridgetops which will scour the landscape. Some of that snow may deposit in Saskatchewan while the rest will be on lee aspects making more windslabs in sheltered terrain features.

Snowpack Summary

Variable windslabs exist at ridgetop and exposed alpine/ treeline locations. Where the snow is deeper, a solid midpack bridges the weaker layers below. Surface conditions range from wind scoured rocky patches, to sustrugi, to hard slab, with the rare pocket of sheltered soft snow offering a few turns. Un-supportive facets dominate lower elevations.

Avalanche Summary

No new activity was noted on Sunday's patrol. It has been a while since any significant avalanche activity occurred.  However, don't let your guard down since there is a lot of variability in the snowpack across the landscape. 

Confidence

Forecast snowfall amounts are uncertain on Monday

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.