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Avalanche Forecast

Archived

Jan 26th, 2013–Jan 27th, 2013

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

Regions

South Columbia.

Confidence

Good

Weather Forecast

Next active system (aka fresh snow?) not expected until Monday; 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 becoming west light to moderate, TEMPERATURE -5 to -10 C near treeline with freezing level to 900m possible, PRECIPITATION traces of new snow possible.Monday: WIND NW moderate to strong, PRECIP 15 to 20 cm late in the day, TEMP -5  near treeline but freezing level could climb again to 800m ahead of the cold frontTuesday: Another 15 to 20 cm of snow, light to moderate NW wind, slightly cooler  with -10 C near treeline.

Avalanche Summary

On Thursday small natural avalanche cycle took place in the storm snow up to size 2 which ran on the January 23rd interface mostly on N and E face. Friday either no new activity or small loose were common; a few small slabs. GNP was the expception with moderate Na cycle to size 3 Fri AM in low density HST.

Snowpack Summary

HST 40 to 50 cm over Jan 24 SH/sc. HST settling into soft slab - watch on solar and SH (esp BTL). Pockety WSL N & E aspects. Jan 4 SH down 90 TL & BTL. Rime or Zr CR reported in Monashees.(Eagle Pass, MPS)

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.