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Avalanche Forecast

Archived

Mar 26th, 2021–Mar 27th, 2021

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

Regions

South Coast.

Mainly overcast Saturday prior to the next round of precipitation on Saturday night into Sunday.

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

FRIDAY Night: Mostly cloudy, moderate northwest wind, freezing level around 1100 m with treeline temperatures -1 C. 

SATURDAY: Mainly cloudy with flurries starting in the afternoon, moderate west and southwest wind, freezing level rising to 1200 m with treeline temperature near 0 C.

SUNDAY: Snow, accumulation 20-40 cm, moderate to strong southwest wind, freezing level 1000 m with treeline temperatures around -3 C.

MONDAY: Mix of sun and cloud, light to moderate northwest wind, freezing level around 1000 m with treeline temperatures -2 C. 

Avalanche Summary

There have been no reports avalanche activity in the past few days.

Snowpack Summary

10 to 15 cm of snow accumulated on Tuesday night, forming new storm slabs and wind slabs in exposed terrain. This snow overlies 35 to 45 cm of snow from Sunday, which has settled and bonded to the snowpack below. The snow surface may moisten at upper elevations on Saturday as the freezing level hovers around 1300 m. Along ridgelines, cornices are large and always have the potential of failing or being triggered from the weight of a human.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

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.