Avalanche Forecast
Issued: Jan 10th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs, Deep Persistent Slabs and Wind Slabs.
CG,
Avalanche Canada
Persistent weak layers may be triggered from shallow, rocky areas. The resulting avalanche may start well away from where you are currently standing.
With this is mind, be mindful of other groups above and below. Remotely triggered avalanches ruin everyone's day!
Summary
Confidence
Avalanche Summary
One sz 2 loose, solar-triggered avalanche was observed Monday in the Mannix path, stopping mid-path.
Several small loose sluffs (size 1 or less) from steep solar aspects were also observed during brief sunny periods on Monday.
Snowpack Summary
5-10cm of new snow has freshened up the surface. Small lenses of wind slab are found immediately on ridgetops and in their lee. This sits on a settled upper snowpack. There may be a thin sun crust on steep S-SW aspects from Monday's sunshine.
The December 23rd facet interface is down ~60cm and appears to be gaining strength, but remains a concern in shallow snowpack areas.
The November 17th facet/crust/surface hoar layer is down ~100cm and has become less reactive in snowpack tests. When it does fail, there is a dramatic 'drop' of the entire snow column. Spooky!
Weather Summary
There's a storm on the horizon, but things always look bigger from a distance! One more day of calm, then a warm, wet storm on Thurs/Fri.
Wed: mix of sun/cloud, Alp high -4*C, 1200m FZL, light SW ridge winds
Thurs: snow and rising temps later in the afternoon, 10-15cm, Alp high -1*C, 1600m FZL, mod/strong SW ridge winds
Fri: flurries, 10cm, Alp high -1*C, 1800-2000m FZL, light to gusty moderate SW ridge winds
Terrain and Travel Advice
- Be carefull around freshly wind loaded features.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
Problems
Persistent Slabs
30-60cm of settled snow buries the Dec 23 facet interface. This layer will be a concern in thin rocky areas, on convex rolls, or in areas where the snowpack is unsupported.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
The Nov 17 layer, down 60-120cm, consists of facets, a rotting crust in some locations, and decomposing surface hoar. Though becoming less likely to trigger, the resulting avalanche would be quite destructive.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
10cm of snow and moderate Southerly winds Sunday night into Monday formed fresh wind slab in the alpine and into the tree line. If triggered these wind slabs could step down to deeper instabilities.
Aspects: North, North East, East, South East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 11th, 2023 4:00PM
