Bulletin d’avalanche

Jasper

Mar 28 – 29, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Despite the moderate rating the forecasters do not have much confidence in this snowpack. The spatial variability and shallow nature adds to the complexity. There is a low probability of triggering but severe consequences if you get it wrong.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Some 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
    Unlikely - Possible
    Taille
    1–2
    This problem will increase with forecasted warm temps and intense solar radiation. The danger rating will rapidly increase particularly on thin snowpack zones and sun facing slopes.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    This problem has been most active in the Whistler/Portal Creek area but is widespread through the forecast region. When triggered, it will be big with serious consequences. Warm and sunny conditions will increase this danger.

Weather Forecast

Expect Monday night light flurries and -9. Tuesday will be freezing level of 2300m and variable clouds. A good overnight freeze Tuesday night and Northerly light winds. Wednesday and Thursday night there will be no freeze hovering around 2300m. Wednesday-Thursday will be very warm, sunny, and continued light North winds.

Snowpack Summary

Cold overnight temps and warming by midday is creating spring like snowpack and surface crusts. Significant variation in snowpack depth through-out the forecast area but generally shallow and below threshold in valley bottoms. Weak basal depth hoar exists. Maligne/Whistler creek areas less snowpack and higher spatial variability.

Avalanche Summary

Shooting cracks in the Maligne lake Bald Hills flats a result of surface crust over weak facets and shallow conditions. Loose wet slides on solar aspects in the south end of the park occurred on Friday with high temperatures. Saturday observed size 2.5 on SW'ly aspect near the Boundary and large serac collapse on the north glacier of Mt. Athabasca. 

Confidence

Freezing levels are uncertain on Wednesday

Régions couvertes