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Avalanche Forecast

Archived

Dec 25th, 2013–Dec 26th, 2013

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, 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

South Rockies.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Thursday: Mainly cloudy / Moderate west winds with extreme gusts / Freezing level at 1500mFriday: Mix of sun and cloud with some flurries / Moderate west winds with extreme gusts / Freezing level at 1400mSaturday: Mainly cloudy / light winds / Freezing level at 1100m

Avalanche Summary

On Monday there was widespread natural and human-triggered activity within the top 15cm of snow to size 1 in the Elk Valley South area. The activity occurred in response to new snow and wind. On Christmas Eve explosives control in the region produced a few size 1 wind slabs. On the same day a backcountry skier triggered a size 2 slab avalanche on an alpine slope in the Harvey Pass area. The slab was reportedly 70cm deep and 150m wide and was thought to have slid on the late-November crust/facet interface. There were no reported injuries with the avalanche.

Snowpack Summary

There appears to be a lot of snowpack variability across the region. Snowpack depths at treeline seem to vary from 50 - 110 cm with high variability in wind-exposed areas. Mostly modest amounts of low density snow have fallen over the last week and have likely been shifted into small wind slabs in exposed areas. Located just below the surface is a layer of weak faceted crystals which formed during the cold snap at the beginning of December. At this point, there does not seem to be enough of an overlying slab to create a widespread problem. In the mid pack is the late-November/early-December interface which is made up of surface hoar, a crust, and/or facets. This layer is typically down 30-70cm and has reached the tipping point for rider triggering in the Harvey Pass area. Check out this video of a recent snowpack test on this layer. A buried crust from mid-November can be found near the base of the snowpack below 1650 m and is breaking down into facets.

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.