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Avalanche Forecast

Archived

Jan 12th, 2014–Jan 13th, 2014

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

Regions

Northwest Inland.

Confidence

Poor - Freezing levels are uncertain on Tuesday

Weather Forecast

Synopsis: A ridge of high pressure will build to the south deflecting a series of storms at the North Coast.  A moist, sub-tropical moisture stream looks to feed these systems with moisture spilling over the coast ranges into the inland regions. Tonight and Monday:  Flurries overnight continuing through Monday / Moderate to strong west winds /  Freezing level 600m..Tuesday: Heavy snow becoming rain/ Strong to extreme southwest winds / Freezing levels 2500m in the Bulkley, 1500m north of the Skenna Wednesday: Cloudy / Light northwest winds / Freezing level 800m

Avalanche Summary

No new avalanches observe

Snowpack Summary

A recent profile from 1400m elevation on a Northwest aspect in the Hankin area shows the height of snow to be about 155 cm.Up to 50 to 65cm cm of low density snow now overlies heavily wind-affected surfaces at upper elevations and well developed surface hoar or crust at mid-treeline and below.  These layers will be something to watch as the overlying snow settles into a more cohesive slab.The mid and lower snowpack are found to be generally gaining strength with depth until the bottom 20-40cm where weak faceted crystals exist down to the ground.

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.