Lawinenlagebericht

Jasper

Mar 24 – 25, 2013Parks Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

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

Good overnight freeze is occurring; however, the sun packs a punch. The danger will increase in the afternoons at all elevations particularly on South aspects, gullies, and sun affected bowls. Gauge the amount of overnight freeze to start your day.

Lawinenprobleme

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3
    Cornices will become increasingly prone to failure as the days get warmer. They are a hazard in themselves plus their failure is a large trigger which may initiate large avalanches potentially running full path. Watch what's overhead. 

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3
    The March 13 90cm of snow has melded with the snowpack making for a deep persistent slab. North and South winds make it present on a variety of aspects overlying weak basal facets. Cornice failures can trigger this in a big way.

Weather Forecast

Monday to Wednesday will be clear skies, strong diurnal temperature fluctuation, and light W to NW winds. Freezing level is incrementally increasing each day this week. Monday it will be 1700m, Tuesday 1800m, and clouds on Tuesday evening may prevent a good overnight freeze starting the day off warm for Wednesday.

Snowpack Summary

A variable thick slab exists in alpine and treeline locations on a variety of aspects. It is over a strong midpack except in shallow locations where you could trigger basal facets or depth hoar weakness at the ground. At treeline in south facing terrain, their is a suncrust 80 cm deep. Strong diurnal temperature fluctuations have helped stability. 

Avalanche Summary

No Sunday patrol. Nothing new noted on Saturday's Icefield's patrol with good visibility. A size 3 noted on Friday off Indian ridge main peak up Whistler creek scrubbing to ground, cornice fall trigger, and ran far. Thursday in Shangrila a size 3 was triggered by cornice fall in the afternoon heat, scrubbed to ground, 2m crown, and ran full path.

Confidence

Freezing levels are uncertain

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