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Avalanche Forecast

Archived

Jan 26th, 2013–Jan 27th, 2013

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Cariboos.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Next active system (aka storm) is not expected until Monday and is likely to arrive with lots of wind. Tuesday may be cold and dry (if you're under the arctic air) or warmer with more snow (if you're south of the arctic front).Overnight & Sunday: WIND  West moderate to strong, TEMPERATURE around -10 C near treeline with freezing level to 600m possible, PRECIPITATION less than 10 cm of new snow possible.Monday: WIND NW moderate to strong, PRECIP 20 to 25 cm, TEMP -5 C but freezing level could climb again to 700m ahead of the cold frontTuesday: colder with -15 near treeline and below freezing at all elevations, light wind, and another 5 - 10 cm of snow

Avalanche Summary

No new avalanches reported from the first few sets of observations Saturday. Loose snow slides and soft slabs are running quite far and fast on the sugary facets the storm snow covers. Most reports were for small avalanches (to size 1.5) from steep terrain.

Snowpack Summary

Storm snow accumulations over the past few days are generally around 40 to 50 cm. This snow remained quite powdery & uncohesive on Friday but is starting to settle into a soft slab. That suggests the snowpack is gaining strength in most terrain, however it could change the avalanche character from relatively harmless loose sluffs to more dangers slab avalanches. The new snow covers a crust on steep S aspects and a patchy surface hoar layer on shady sheltered slopes at treeline and below. The early January surface hoar layer is down 70-90 cm. In the southern Monashees a freezing rain crust was reported on the surface Friday.

Problems

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.

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.