Lawinenlagebericht

Jasper

May 5 – 6, 2019Parks Canada
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Lawinengefahr

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

As Spring finally re-asserts itself, expect to see increasing activity with daytime warming.  Meanwhile, incremental loading by small snowfalls has maintained winter-like avalanche problems on shaded slopes.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2.5

    Wind slabs are more prevalent in the Marmot/Maligne areas than the icefields, as they received more recent snowfall and wind.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1.5–3

    Weak mid-pack facets, in isolated pockets on shaded, wind-sheltered alpine slopes. May also exist on shaded upper treeline features; and on solar aspects there is a (smaller) possibility of these failing on facets over a buried crust down 15-40cm.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–1.5

    Springs' increasing influence is encouraging the upper snowpack to shed recent snowfall, in loose snow avalanches. Snowballing or sticky snow are indicators of this problem.

Weather Forecast

Mon-Weds: Mixed sun & cloud, light winds, no significant precip, gradually rising freezing level. Initially cool overnight temps become warm by midweek.

Mon: Scattered cloud, Freezing levels 2500m, treeline low -4, High +3

Tues: Cloud & flurries developing. Freezing level 2600m, treeline low -1.5, high +5

Wed: Treeline Low -0.5, freezing level 2700m.

Snowpack Summary

Regular small, warm snowfalls have sustained Windslab and loose snow avalanche problems. This recent snow is settling rapidly, but overlies crusts and facets in the upper snowpack. The crusts are thick/strong on solar aspects. Occasional whumpfing at upper treeline & alpine. The snowpack remains faceted on shady aspects, and weak in shallow areas.

Avalanche Summary

On Sunday, a large natural slab avalanche was observed at 2400m on a NE aspect. This was on Pyramid mountain near Jasper, and was most likely a recent Wind Slab (size 2.5). Numerous small (size 1), natural loose dry avalanches were also observed on steep shaded alpine terrain near Marmot Basin.

Confidence

Due to the number of field observations on Sunday

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