Bulletin d’avalanche

Jasper

Feb 14 – 15, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Strong winds and new snow are building fresh windslabs and burying evidence of previous activity. Human triggering remains a serious concern in avalanche start zones that have not had activity in the past week.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5
    Up to 15cm of new snow is being blown in to fresh windslabs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5
    Persistent slabs remain a problem. The main concern is for areas exposed to large triggers such as cornices and large South facing alpine terrain exposed to the sun.

Weather Forecast

An upper level northwest (Aleutian) flow is pushing a couple of cold fronts through our area on Wednesday.  Up to 10-15cm of snow is forecast, with strong SW switching to light NE winds and seasonal temperatures.  Thursday we will see a bit of a break in the precip, and possibly some sun.  On Friday more snow is forecast.

Snowpack Summary

5-10cm of new snow has been blown in to fresh slabs by moderate to strong SW winds. These wind slabs overlie a settled upper snowpack which is sitting on the persistent weak layers in the mid snowpack. Many slopes had avalanche activity on these weak layers during last weeks storm, slopes without previous activity remain suspect.

Avalanche Summary

A couple of fresh slab avalanches (likely failing on a persistent mid snowpack weakness, and up to size 2) were observed by field teams at treeline elevations on Tuesday - likely triggered by significant wind transport and warming temperatures.

Confidence

Forecast snowfall amounts are uncertain

Régions couvertes