Avalanche Forecast
Issued: Dec 26th, 2018 3:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs.
mconlan,
Avalanche Canada
For the north of the region, be diligent around treeline, where a buried weak layer still lingers. See the forecaster's blog here, which describes this persistent problem.
Summary
Confidence
Moderate - Due to the number of field observations
Weather Forecast
WEDNESDAY NIGHT: Clear skies in the north of the region and mostly cloudy in the south, freezing level below valley bottom.THURSDAY: Mix of sun and cloud, moderate northwest winds, alpine temperature -8 C, freezing level below valley bottom.FRIDAY: Cloudy with light snowfall, light to moderate west winds, alpine temperature -6 C, freezing level below valley bottom.SATURDAY: Cloudy with snowfall, accumulation 10 to 15 cm, strong southwest winds, alpine temperature -3 C, freezing level 1800 m.
Avalanche Summary
Reports are limited, but no avalanches were observed in the region on Tuesday.
Snowpack Summary
5 to 10 cm of snow fell on Wednesday, covering what is reported to be a widespread weak layer of feathery surface hoar. Below this, about 30 cm of recent storm snow sits on a melt-freeze crust below around 1800 m. Reports are limited, but they suggest that the snow is bonding well to the crust.In the north portion of the region and possibly the far south, a weak layer of facets and surface hoar lies below all this storm snow, around 100 to 150 cm deep. The weak layer appears most prominent around treeline, up to 2000 m. There has not been reports of avalanche activity on this layer for 5 days. Although this layer is likely gaining strength, field observations show that slab avalanches remain possible on this layer where it exists.Near the base of the snowpack, a crust exists with weak and sugary facets beneath it. This could potentially still be of concern in high north-facing aspects where the snowpack rests on very smooth ground cover. A very large trigger, such as a cornice fall, would likely be needed to form an avalanche on this layer.
Problems
Persistent Slabs
A weak layer buried 100 to 150 cm still has the potential to produce large avalanches. This layer is likely most problematic in the north of the region and possibly the far south, around treeline and lower alpine elevations.
Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.Use conservative route selection and choose moderate-angled slopes with low consequence.Cornices are large and looming, and could trigger persistent slabs on slopes below.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 27th, 2018 2:00PM
