Lawinenlagebericht

South Columbia

Feb 16, 2017Avalanche Canada
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Archiviert · abgelaufen 10 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Watch for conditions that change with elevation. Heavy rain at lower elevations means heavy snow up high.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Touchy fresh wind slabs are likely lurking below ridgecrests and behind terrain features at higher elevations.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3
    A persistent weakness down 50-80 cm remains remains sensitive to light triggers in isolated areas. Smaller avalanches have the potential to step down to this layer.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Loose wet sluffs are expected in steep terrain features at lower elevation. Although generally slow moving, they can easily take you for a ride and run significant distances. They also have the potential to trigger slabs on the slopes below.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

THURSDAY: 10-20 mm of precipitation with moderate southerly winds and freezing levels around 2000 m.FRIDAY: Unsettled conditions with isolated flurries, moderate becoming light southwesterly winds and freezing levels dropping to 1500 m.SATURDAY: A mix of sun and cloud with flurries possible late in the day, light winds and freezing levels around 1300 m.

Avalanche Summary

Reports from Tuesday include continued natural loose wet avalanche activity up to size 1.5 on steep sun exposed slopes. On Monday, natural Size 3 was reported on a northeast aspect at 2500 m, and a natural cornice triggered Size 2 slab avalanche was observed on a southeast aspect at 2500 m. A MIN report from Sunday describes a remotely triggered size 3 avalanche on London Ridge. Click here for more details. Rain at lower elevations is expected to destabilize the upper snowpack resulting loose wet sluffing and potentially increasing the sensitivity of triggering persistent slab avalanches. In the alpine, touchy new wind slabs have the potential to step down and trigger persistent slab avalanches.

Snowpack Summary

Around 10 cm fresh snow has fallen at higher elevations accompanied by strong southerly winds, while elsewhere the snow surface has become wet, loose and cohesionless from rain and previous sun-exposure. Rapidly settling storm snow from last week is still bonding poorly to the previous snow surface from early February, which is now down 60-80 cm and includes a sun crust on steep sun-exposed slopes, faceted snow, as well as surface hoar on sheltered open slopes. Recent strong winds from the south and west had redistributed the recent storm snow in exposed terrain forming wind slabs.  The mid and lower snowpack are generally well settled and stable in deeper snowpack areas but may be faceted and weaker in shallower areas.

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