Boletín de aludes

North Columbia

Mar 24 – 25, 2021Avalanche Canada
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Archivado · caducó 6 years ago

Peligro de aludes

Fri
Sat
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

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

 

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2

    40-60 cm of recent snowfall has potential to form reactive slabs on some steep terrain features. The most likely spot to find reactive slabs is where there has been additional wind loading in lee terrain. There are also some surface hoar and crust layers in the upper snowpack, and while none of these layers are overly concerning, they may act as sliding layers for storm slabs.

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.

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