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Avalanche Forecast

Archived

Mar 27th, 2021–Mar 28th, 2021

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

Regions

South Coast.

There is uncertainty with forecast precipitation amounts Saturday night through Sunday. If snowfall amounts materialize as forecast, then the avalanche danger will certainly be High.

Confidence

Low - Forecast precipitation (either snow or rain) amounts are uncertain.

Weather Forecast

SATURDAY Night: Snow or rain, accumulation 15-25 cm, moderate to strong west and southwest wind, freezing level rising to 1400 m with treeline temperature near 0 C.

SUNDAY: Snow or rain, accumulation 15-25 cm, moderate to strong southwest wind, freezing level 1100 m with treeline temperatures around -1 C.

MONDAY: Mix of sun and cloud, light to moderate northwest wind, freezing level around 700 m with treeline temperatures -3 C. 

TUESDAY: Mix of sun and cloud, light northwest wind, freezing level around 1000 m with treeline temperatures -1 C. 

Avalanche Summary

There have been no reports avalanche activity in the past few days. Strom slab and wet loose avalanche activity is expected to increase in the coming days with the arrival of new snow, rain and moderate to strong wind.

Snowpack Summary

A mix of rain and snow on Saturday night and Sunday may bring 30-50 cm of new snow to upper elevations. Forecast moderate to strong winds will redistribute this new snow. It will on 30-50 cm of snow that fell through the previous week. Rain at lower elevations may make the upper snowpack wet or moist as the freezing level hovers between 1200 and 1400 m through the storm. Along ridgelines, cornices are large and always have the potential of failing or being triggered from the weight of a human.

Terrain and Travel

  • Minimize exposure during periods of heavy loading from new snow, wind or rain.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • As surface loses cohesion due to melting, loose wet avalanches become common in steeper terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

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.