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Avalanche Forecast

Archived

Apr 18th, 2018–Apr 19th, 2018

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

Regions

South Coast.

Warming and sun on Thursday will weaken the recent snow and increase the likelihood of triggering avalanches. Be extra cautious on south-facing slopes. Avoid exposing yourself to hazard from large slopes or cornices overhead while its sunny or warm.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

TONIGHT: Clear. Ridge wind light, south. Temperature at treeline near +2. Freezing level 1600 m.THURSDAY: Mostly sunny. Ridge wind light, southwest. Temperature at treeline near +3. Freezing level 1600 m.FRIDAY: Cloudy. Rain changing to snow beginning in the evening. Precipitation 15-30 mm. Ridge wind light, south. Temperature at treeline near 0. Freezing level 1500 m, lowering to 1000 m.SATURDAY: Mostly cloudy, snow ending. Accumulation 10-20 cm. Ridge wind moderate, southwest. Temperature at treeline near -1. Freezing level 1200 m.

Avalanche Summary

We have received very little information on avalanche activity for this region. From what we have heard, skiers could easily trigger small loose wet avalanches on Monday. Natural loose wet avalanches were also observed in treeline and alpine terrain, particularly on southerly aspects. Over the weekend, large slab avalanches were also observed on the North Shore mountains that may have released during the storm on Friday. Read MIN report hereFurther north near Squamish reports indicated sun-induced natural activity on Sunday in alpine terrain.We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Above about 1200 m, 50 to 60 cm of moist snow sits on a predominant crust that formed at the beginning of April. The snow below this is well-settled and strong.Below 1200 m, a spring snowpack exists.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.