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Avalanche Forecast

Archived

Mar 5th, 2021–Mar 6th, 2021

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 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

Kananaskis.

Watch the quality of the freeze overnight on Friday and be mindful of solar radiation if the sun comes out this weekend. Some new new will be needed as it looks like early april out there as opposed to early march!! Sheltered north aspects are the best skiing opportunities.

Confidence

Moderate -

Weather Forecast

The cooler air is forecast to move back in tomorrow with some light flurries expected. Winds are forecast to be light out of the SW. Freezing levels will be around 1800m (Burstall pass parking lot elev) but due to clouds overnight the quality of the freeze may not be great. Check the weather stations before you head out in the morning. If the sun does come out, expect stability to detr' quickly.

Avalanche Summary

A few loose wet slides out of steep solar areas at treeline and below was observe by midday when forecasters returned from the field. 

Snowpack Summary

Temperature crusts can be expected up well into the alpine on solar aspects and even on western aspects and on all aspects except pure north below treeline. This will be a layer to pay attention to as it get buried here this spring. The upper snow pack consists of a variety of windslabs that are overlying two inportant layers. The feb 19th facets as well as the Jan 29th interface. Despite not seeing much activity on these layers over the past few days they are still forefront in our minds. If anything the recent warm weather helped these layers to strengthen but the overlying windslabs are still stiff, and able to propagate if triggerred from a thin weak area. Dig, be curious and evaluate these interfaces as you go. Forecasters have felt drummy windslabs above treeline all week.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid lee and cross-loaded terrain.
  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • Be alert to conditions that change with elevation and sun exposure.
  • Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet

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.