Bulletin d’avalanche

Jasper

Jan 31 – Feb 1, 2019Parks Canada
Voir sur la carte
Archivé · expiré 8 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

There is large uncertainty around forecast snowfall amounts on Friday and Saturday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    New snow on Sunday arrived with Strong winds (ranging from SW to N) creating windslabs over a variety of surfaces, including suncrust, surface hoar, and wind pressed areas.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3.5
    A natural avalanche Monday on this layer shows that only minor changes may wake this generally dormant dragon. Triggering is most likely in thin areas, with variable snowpack depth. Use terrain choice and safe practices to minimize consequences.

Weather Forecast

Thursday will be cloudy with scattered flurried. Treeline high temperature of -6C, with light-Moderate SW winds. Friday-Saturday: Temperatures stay steady around -5 until plummeting Saturday afternoon. 30cm of snow is forecast with light to moderate winds from the SW A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Sunday's snowfall along with SW - NW winds created wind slabs in lee and cross-loaded terrain. Expect a crust on solar slopes at treeline. The upper snow pack continues to settle and the layer of weak surface hoar is now buried 5-10cm deep. Below, a strong mid-pack sits over depth-hoar in the lower third of the snowpack giving sudden results.

Avalanche Summary

A natural Size 3 Deep Persistent slab was observed Monday on a steep (35+ degrees) Alpine South-West facing slope. Triggered by a smaller windslab, it stepped down to depth hoar and the ground. Several windslabs to Size 2 were also observed (Alpine S and E aspects). Help forecast - share observations HERE, on the Mountain Information Network!

Confidence

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

Régions couvertes