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Avalanche Forecast

Archived

May 4th, 2019–May 5th, 2019

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

Regions

Jasper.

Good skiing can still be found in sheltered areas in the alpine.

Weather Forecast

Sunday broken skies and no new snow, Freezing levels to rise to 2300M

Monday broken skies with no new snow, Freezing levels to 2500M

Tuesday mix of sun and cloud with no new snow, Freezing levels 2600M

Snowpack Summary

10cm-20cm recent snow (elevation dependant) covers widespread wind effect from previous N winds, overlying crusts and facets in upper snowpack. The crusts are bridging on solar aspects. Occasional whumpfing at upper TL and in the ALP. Snowpack structure is generally faceted on polar aspects and weak in shallow areas.

Avalanche Summary

No new observations from field teams today.

Confidence

Intensity of incoming weather systems is uncertain

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.