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Avalanche Forecast

Archived

Apr 5th, 2015–Apr 6th, 2015

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

Regions

Northwest Coastal.

Hazard may increase with daytime warming especially on slopes affected by solar input. Cornice features should be regarded with care.If you have observations to share, please tell us what you've seen here on the mountain information network

Confidence

Fair - Due to the number and quality of field observations

Weather Forecast

No precipitation in the forecast for the next few days. Daytime warming will bring freezing levels to around 1300m for the forecast period. Alpine winds are expected to be light from the E-SE.

Avalanche Summary

No recent reports of avalanches have been received

Snowpack Summary

Recent storm snow varies across the forecast area, with the biggest accumulations near the coast. With warming temperatures the storm snow is bonding slowly to the variety of old snow surfaces including a layer of surface hoar and facets buried on March 25th. This weakness, now down approximately 40 to 60cm has been touchy with a high propensity for propagating fractures. The problems seems more touchy in the northern part of the region, but has been reported throughout the northwest coastal area. Weaknesses have also been found within the recent storm snow with snowpack tests producing moderate sudden results in the top 20 to 40cm. The early March facet/crust persistent weakness is now down around a metre and appears unreactive with snowpack tests.

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.