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Avalanche Forecast

Archived

Feb 4th, 2017–Feb 5th, 2017

Alpine
Natural avalanches possible, human triggered probable.
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 possible, human triggered probable.
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

Little Yoho.

Current forecasts are showing 15-20cm Saturday night through Monday. Ice climbers should be cautious approaching routes and climbing in gully terrain if snow amounts and valley winds materialize.

Weather Forecast

15-25 cm of snow is expected Saturday night through to Monday with an upslope component. There is still uncertainty with amounts. Mainly light to moderate East winds and the possibility of a "Yoho blow" which means increased valley winds. -15C as the high tomorrow and into the -20's for Monday.

Snowpack Summary

10-15cm over the last 24 hours. This sits on previous hard surfaces from winds last weekend. A generally weak snowpack exists below 2000m. At 2000m there is about 150cm with the Jan 17 surface hoar layer down 40cm. In the mid-pack, the Dec facets are around 20cm thick. Deeper snowpack areas closer to the Wapta have a much more solid snowpack.

Avalanche Summary

No new avalanches reported in the last 24 hours.

Confidence

Forecast snowfall amounts are uncertain on Sunday

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.