Bollettino valanghe

Jasper

Jan 11 – 12, 2020Parks Canada
Vedi sulla mappa
Archiviato · scaduto 7 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Natural activity is tapering off but human triggered avalanches initiating in the basal weakness remains likely in the right spot. Conservative line choice and mitigating overhead exposure is the key for safely venturing out before the deep freeze!

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3

    Avalanche activity will taper off Saturday but human triggered avalanches are still likely.

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2

    Caution in steep gullies and terrain traps where a small sluff could have large consequences. Avoid terrain where this problem can initiate slab avalanches on deeper layers.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3

    On Wednesday numerous avalanches were observed throughout the region that failed to ground.

Weather Forecast

The arctic air mass continues to advance from the NE.

Saturday - Mainly cloudy with scattered flurries to 4 cm. Alp High -9 °C. Ridge wind SW10-25 km/h.

Sunday - Cloudy with sunny periods and isolated flurries. Ppt Trace. Alp Low -33 °C, High -18 °C. Wind SE10-20 km/h.

Visit CAA's Mountain Weather Forecast for more specific details.

Snowpack Summary

Up to 60cm new snow since January 1st. Consistent SW winds creating wind slab on lee aspects in the alpine and treeline. This overlies buried surface hoar up to 2000m in sheltered areas as well as buried wind slabs on lee features at treeline and above. Well consolidated midpack. The bottom of the snowpack consists of depth hoar and facets.

Avalanche Summary

Recent widespread avalanche cycle up to size 3 on all aspects and elevations - wind slab, dry loose and deep persistent slab.  Suspect continued slab development on lee features with natural activity tapering off.  Human triggering of wind slab and deep persistent remains likely.

Confidence

Due to the number and quality of field observations on Saturday

Regioni coperte