Lawinenlagebericht

South Rockies

Feb 9 – 10, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
2 · Mässig
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Kernpunkte

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    Pockets of wind slab are likely to exist at higher elevations on a variety of aspects and may react to the weight of a skier/rider. Steep sheltered terrain could see loose dry or wet snow avalanches depending on aspect.

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–4
    Large and potentially weak cornices loom over open slopes and may fail with daytime warming and solar radiation.

Avalanche Summary

There was one report of a size 1.5 slab avalanche from a steep south aspect in the alpine on Thursday that appeared to involve the recent storm snow. There were also a few size 1 loose snow avalanches were reported running out of steep terrain.

Confidence

Good

Weather Forecast

Sunday: A ridge of high pressure should maintain dry conditions and sunny skies. The freezing level is around 1600 m with mountaintop temperatures around -5. Winds are light from the northeast. Monday: The ridge should hold for one more day allowing for a mix of sun and cloud. The freezing level should be around to 1500 m. Winds increase to moderate from the west. Tuesday: A frontal system should move across the region bringing more cloud and a chance of flurries. The freezing level is around 1000 m. Winds are moderate from the southwest.   

Snowpack Summary

Up to 15 cm of recent snowfall has been redistributed into dense or hard wind slabs at higher elevations from variable winds. Moist snow or a hard sun crust is likley on steep solar aspects depending on whether or not the sun is shining. The new storm snow overlies old wind slabs in exposed areas, settled storm snow or spotty surface hoar in more sheltered terrain, and a crust on previously sun-exposed slopes. A variable interface (surface hoar/facets/sun crust) was buried on Jan 23 and is down about 20-40cm. In most locations it now appears to be well bonded. The lower snowpack is generally well-settled. Cornices in the region are reported to be well developed and loom over heavily used slopes. These cornices deserve our respect, especially with clear skies and warming forecast for the weekend.

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