Lawinenlagebericht

Banff Yoho Kootenay

Apr 20 – 21, 2018Parks Canada
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Archiviert · abgelaufen 8 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Kernpunkte

Expect a poor freeze below 2300m Saturday and increased PM danger if the sun pops out. We will be switching to "spring conditions" over the next couple of days. The coming week looks to be a warm one.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    20-50 cm of storm snow has fallen over the past few days which had intense wind loading earlier in the week. These previous wind slabs are losing sensitivity, but some new snow and strong winds on Saturday will add to this problem in the short term.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1.5–3
    A few avalanches in the last two days were much deeper than the majority. Some of these clearly stepped down to the March 15 crust and on shaded aspects were likely sliding on facets associated with the same burial date

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Sun wont be a major issue for most of the day Saturday, but watch for some clearing skies later in the afternoon, especially in the front ranges. With a poor freeze lower elevations could also be a concern if we receive some rain.

Weather Forecast

10cm along the divide and only a few cm (maybe some light rain) along the eastern slopes expected Saturday. A poor lower elevation freeze can be expected, temps will start to cool as a cold front moves through mid day. Upper elevation SW winds will increase through the day. Next week looks like a dramatic warming trend.

Snowpack Summary

Up to 50 cm of storm snow near the divide affected by strong SW winds Tuesday evening. Several buried temperature crusts exist to 2000m on all aspects and to ridge tops on solar slopes, including the Mar 15 sun crust down 35-50 cm in the alpine. Moist snow at lower elevations, with the entire snowpack becoming moist near valley bottom.

Avalanche Summary

Avalanche control yesterday produced mainly windlslabs in the sz 2 range 20-50cm deep with decent propagations up to 50m wide. Several of these events entrained more mass as they moist snow at lower elevations. During flights, evidence of a natural cycle to sz 3 could be seen in the Banff region mainly Ne facing windslabs from the last 48 hours.

Confidence

Freezing levels are uncertain on Saturday

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