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Avalanche Forecast

Archived

Apr 21st, 2019–Apr 22nd, 2019

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

Regions

Jasper.

Use conservative route finding to manage a freshly loaded persistent problem.

Keep an eye out for building windslabs.

Weather Forecast

Monday upto 8cm of snow accompanied by moderate SW winds gusting to 55km. Freezing levels to rise to 2200M

Tuesday will see cloud with an additional 5-10cm throughout the day along with moderate west winds. 2200M freezing levels

Wednesday will see slightly cooler temps -6 with winds remaining in the moderate west range and lower freezing levels 1900M

Snowpack Summary

15cm of recent settled snow now overlies several crusts / facet layers in the upper 40cm, and a faceted layer down 70cm on shady aspects. Expect isothermal snow at lower elevations.

Avalanche Summary

Recent whumfing in low angle alpine terrain.

Natural and controlled avalanche cycle on friday produced persistent slabs, wind slabs and loose dry avalanches to mainly size 2 max size 3 in the alpine. 

Confidence

Intensity of incoming weather systems is uncertain

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.

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.