Bulletin d’avalanche

Jasper

Apr 3 – 4, 2016Parks Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Rain on Monday will continue the avalanche cycle.  Will be hard to find any good skiing until we get back into classic spring melt freeze conditions.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Increase occurrence of cornice failures are being noted. It can act as a large trigger initiating deep weaknesses plus their sheer mass, whether or not it initiates an avalanche, would be like being hit by a car.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Be observant of overnight freezing temperatures relative to degree of surface freezing.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–4
    Warm overnight temps and forecasted light rain will increase the danger of this problem on Monday.  Shallow areas are likely trigger spots. Cornice falls could also act as a trigger. Consequences would be severe.

Weather Forecast

The freezing level will be around tree-line overnight. Overcast on Monday  with light rain and freezing level staying high. Similar conditions expected on Tuesday.

Snowpack Summary

Snow conditions are isothermal below 2200m, warm snowpack into the Alpine even on Northerly facing aspects. Persistent slab present at tree line and above. The snowpack at all elevations has a weak base and several mid-pack weaknesses. Many areas below tree line are under threshold especially lower elevations and southerly aspects. 

Avalanche Summary

A widespread avalanche cycle continues (beginning on Thursday). Point releases and wet slab avalanches to size 3 running at all elevations primarily on solar aspects. Fewer slides are occurring on northerly terrain. Ice climbs are cracking and collapsing because of the warm temps.

Confidence

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

Régions couvertes