Lawinenlagebericht

North Columbia

Apr 1 – 2, 2017Avalanche Canada
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Archiviert · abgelaufen 10 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

The snowpack still hasn't adjusted to spring weather at high elevations. Keep your guard up and an eye on overhead hazards while persistent slab problems are still in play.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    3–4
    Large, destructive avalanches have recently been reported running on deeply buried weak layers. Cornice fall and smaller storm slab avalanches have been common triggers for these slides, which have the potential to reach the end of runout zones.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–3
    Recent snow and wind have formed storm slabs that may remain reactive to human triggering on Sunday. This problem is more pronounced in wind affected areas at higher elevations, so be vigilant for signs of recent wind loading.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    Daytime warming and/or solar radiation may deteriorate the surface of the snowpack at lower elevations and on solar aspects. Snow that becomes moist will have the tendency to sluff from steep terrain, either naturally or with a human trigger.

Confidence

Moderate -

Weather Forecast

Saturday night: Scattered flurries bringing up to 5 cm of new snow. Light southwest winds.Sunday: A mix of sun and cloud with scattered flurries and about 5 cm of new snow. Light west winds. Freezing level to 1400 metres with alpine temperatures around -7.Monday: A mix of sun and cloud. Light northwest winds. Freezing level to 1500 metres with alpine temperatures around -6.Tuesday: Cloudy with sunny periods. Light southeast winds. Freezing level to 1800 metres with alpine temperatures around  -4.

Avalanche Summary

Reports from Friday showed several deep persistent slab releases to Size 3.5 having occurred within the previous 24 hours with natural, cornice fall, and rider triggers. One of these featured a crown fracture of up to 3 metres in depth. Numerous wind slabs were also observed releasing naturally to Size 2.5 while natural loose wet and loose dry slides ranged from Size 1.5-2.Reports from Thursday include numerous observations of storm slabs releasing naturally from Size 1-2.5 throughout the region. Natural triggers (including natural cornice fall) featured prominently in reports. Crown fractures generally ranged from 30-40 cm and northeast to northwest aspects were the most active.On Wednesday, numerous storm slabs up to Size 2.5 were observed. Several Size 1 storm and wind slabs were also reactive to rider triggering.

Snowpack Summary

About 10 cm of new snow fell over Friday night and Saturday morning, burying a temperature crust at about 1900 metres and below as well as sun crust all the way into the alpine on most solar aspects. The new snow brings recent storm snow totals at upper elevations to 40-60 cm. This storm snow is dry up high and moist at 1800 m and below. 90-130 cm of accumulated snow now overlies a rain crust below 2000 m and sun crust on solar aspects at higher elevations. New wind slabs are developing on leeward slopes and behind terrain features and large, fragile cornices exist along ridgelines. At higher elevations, the February weak layers are down 150-190 cm and woke up during last week's storm with many avalanches stepping down to them. The deep mid-December facet layer and November rain crust both still linger near the bottom of the snowpack and a few avalanches and cornice falls have also stepped down to these layers last week resulting in some very large full depth avalanches. These layers remain a real concern while touchier wind slabs and cornices continue to present the risk of acting as a trigger for deeper weaknesses.

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