Regions
South Coast Inland.
Snowfall amounts may vary throughout the region. Localized areas receiving more than 30 cm of new snow may have a higher avalanche hazard and danger may rise to HIGH.
Confidence
Moderate - Intensity of incoming weather systems is uncertain
Weather Forecast
WEDNESDAY: 15 cm (Duffy Lake Road) to 40 cm (Coquihalla) by Wednesday evening. Moderate to strong SW to W winds. Treeline temperatures remaining between -5 and -10 C.THURSDAY: 5 cm (Duffy) to 20 cm (Coquihalla) by Thursday evening. Moderate SW winds. Warming with treeline temperatures a getting close to zero.FRIDAY: Another 20 cm possible (Coquihalla) but dry further north (Duffy). Moderate SW winds. Temperatures starting to cool a few degrees.
Avalanche Summary
Only one slab avalanche reported: a size 2 on a South aspect in the alpine. Some loose dry sluffs reported from steep gullied terrain. Avalanche activity will increase with forecast snow, wind, and warming temperatures.
Snowpack Summary
10-35 cm of snow from the weekend is reportedly bonding poorly to facets and buried surface hoar, as well as crust on previously sun-exposed slopes. Reports from the Duffy Lake area on Sunday include easy whumphing and cracking observed at ridge top. The widespread mid-February crust can be found down 20-60cm and seems to be well-bonded, although is reportedly weakening. In the northern part of the region, a facet/surface hoar weakness buried early February, is now down 60-100 cm and remains reactive in snowpack tests. It is also suspected as the failure plane in at least one of two recent large persistent slab avalanches in the Hurley Pass area. In the Cascades (e.g. Coquihalla), the mid and lower snowpack are well settled and strong. Forecast new snow is likely to arrive with strong SW winds and warming temperatures.
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.
Storm Slabs
Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.