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Avalanche Forecast

Archived

Mar 23rd, 2020–Mar 24th, 2020

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

Regions

Sea To Sky.

New snow is creating heightened avalanche conditions on high elevation slopes.

Confidence

Moderate - Uncertainty is due to limitations in the field data.

Weather Forecast

Unsettled conditions with light flurries for the next few days.

MONDAY NIGHT: Cloudy with light flurries and up to 5 cm of new snow, light southwest wind, freezing level drops to valley bottom, alpine temperatures drop to -10 C.

TUESDAY: Mostly cloud with isolated flurries, light wind, freezing level around 1000 m, alpine temperatures reach -4 C.

WEDNESDAY: Mix of sun and cloud, light north wind, freezing level around 1000 m, alpine temperatures reach -4 C.

THURSDAY: Increasing cloud with light flurries in the evening, moderate southwest wind, freezing level around 800 m, alpine temperatures reach -6 C.

Avalanche Summary

No recent avalanches have been reported, but mountain travel and field observations have been very limited over the past few days. Last week there were many wet loose avalanches, but cooler weather and a dusting of new snow has probably made isolated wind slabs the main concern this week.

Snowpack Summary

5-15 cm of new snow now covers moist and crusty layers that formed over the past week. There is some uncertainty about how well the new snow will bond to these interfaces. A few high elevation, shaded slopes may still hold dry, previously wind-affected snow. The snowpack is generally strong and settled, with the exception of some areas in the eastern and northern parts of the region that have weak faceted snow near the base of the snowpack. However, this layer is considered dormant and has not produced an avalanche since February 20.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Closely monitor how the new snow is bonding to the old surface.
  • Stick to well supported, lower angle terrain.

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.