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Avalanche Forecast

Archived

Mar 24th, 2021–Mar 25th, 2021

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

North Columbia.

Human triggered avalanches are possible on steep open slopes where recent snow has formed slabs. However, in many areas the snow remains loose.

 

Confidence

Moderate -

Weather Forecast

 

WEDNESDAY NIGHT: Cloudy with some lingering flurries delivering up to 5 cm, 20 km/h northwest wind, treeline temperatures drop to -7 C.

THURSDAY: Mostly cloudy with some light flurries but no notable accumulations of snow, 20-30 km/h northwest wind, freezing level reaches 1500 m with treeline temperatures up to -5 C.

FRIDAY: Cloudy wiith some light flurries but no notable accumulations of snow, 20-30 km/h west wind, treeline temperatures around -5 C.

SATURDAY: Cloudy with scattered flurries and 5-10 cm of snow, 20-40 km/h southwest wind, freezing level climbing to 1600 m, treeline temperatures around -3 C.

Avalanche Summary

Recent avalanche activity has primarily been small (size 1-1.5) avalanches in the top 15 cm of snow, many of them dry loose sluffs rather than slabs. A few larger slab 2 avalanches were reported in Glacier NP on Monday and Tuesday. There were also a few human triggered slab avalanches in the Revelstoke area, including this snowmobile triggered avalanche on Boulder Mountain on Monday.

Snowpack Summary

10-20 cm of fresh snow brings totals over the last week to 40-60 cm. This sits above an interface that formed during the mid-March dry spell, which consists of a widespread crust (except on north-facing slopes above 1800 m). n some terrain (primarily wind affected terrain) the surface snow has settled into a slab, however in many areas this snow remains loose. Large cornices loom over alpine ridgetops. Spring temperatures and sun are producing a melt-freeze snowpack below 1500 m and higher on solar slopes.

Terrain and Travel

  • Avoid areas where the snow feels stiff and/or slabby.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Be careful with open slopes and convex rolls, especially in more extreme terrain.
  • 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.