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Avalanche Forecast

Archived

Feb 19th, 2014–Feb 20th, 2014

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

Regions

Glacier.

Stick to simple, well-supported terrain with little overhead hazard. Let the snowpack heal itself before you launch into powder-seeking mode.

Weather Forecast

Mainly cloudy today with isolated flurries and gusting moderate to strong westerly winds. Freezing levels will remain in the valley bottoms. Thursday will bring more flurries, amounting to 5-10cm, along with moderate to strong westerly winds and cool temp's. A drying trend will begin on Friday.

Snowpack Summary

100-140cm of recent storm snow, deeper amounts west side of the summit, is settling over the Feb 10 facet/surface hoar/crust interface. The Jan 28  and Jan 22 surface hoar layers are 5-10cm below this interface. Test results yesterday above Hermit Hut had sudden planar results on the Feb 10 interface, including one large "whumph" at the test site.

Avalanche Summary

Avalanche control overnight produced numerous size 2-3.5's from all aspects, with many slides extending into the end of the run-out zone. The strong S-SW winds overnight likely produced natural activity in open alpine and tree-line elevations.

Confidence

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.