Lawinenlagebericht

Kootenay Boundary

Mar 21 – 22, 2015Avalanche Canada
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Lawinengefahr

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

Loose wet avalanches can really pack a punch at this time, especially below treeline as the temperature rises above freezing.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–3
    Watch for wind slabs at and above treeline, especially near ridge crest and lee of mid slope features like rock outcroppings and ribs.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    Small amounts of new snow resting on a crust combined with above freezing temps below 2000m are contributing to an active loose wet problem. These avalanches could quickly entrain mass growing bigger and running further than expected.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Monday

Weather Forecast

Sunday: Clear skies in the morning, cloud cover increasing throughout the day. Light S winds at treeline, moderate SW at ridgetop. No significant precipitation expected. Freezing level rising to 2000m.Monday: Overcast all day. 1 to 6mm of precipitation, 1 to as much as 15cm of convective snowfall. Freezing level at 1700m. Light NW winds at all elevations. Tuesday: Overcast skies. Freezing level at 1500m. Light variable winds at all elevations. No significant precipitation expected.

Avalanche Summary

Numerous natural and rider triggered avalanches to size 2 were reported Friday as moist storm snow slid on the robust mid-March crust.

Snowpack Summary

15 to 30 cm of new snow rests on the 15cm thick mid-March crust. Wind loaded features may have as much as 60 cm on the crust. During the heat of the afternoon, the snow surface has been reported to be moist or wet at all elevations on solar aspects and up to 2000m on north aspects. At many elevations, melt-freeze cycles are occurring with a weak surface crust forming overnight and then breaking down during the afternoon. Up to 35cm of snow from last weekends storm sits over the mid-March rain crust. Reports suggest that this snow is bonding well to the crust. Older deeply buried persistent weak layers still exist in the snowpack but are no longer expected to be reactive.

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