Bollettino valanghe

Banff Yoho Kootenay

Nov 20 – 21, 2013Parks Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

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

In sintesi

Lots of snow is available for transport. Tricky conditions at higher elevations will exist until the snow has time to settle and bond to the layers below. SH 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Stiffer wind slabs 20-50cm thick in exposed areas. NW winds Wed. will load SE slopes but expect to find these on numerous aspects.

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    Lots of snow available for transport and sluffing will be a major concern in terrain traps. Ice climbs below treeline such as Mt. Dennis will be prone to sluffing, especially if the winds pick up Wed.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Sunshine reporting a touchy storm slab interface down 40-80 cm. This needs time to bond to the previous surface below. Slides initiated on this layer could step down to basal facets or the Oct. melt/freeze crust where present.

Weather Forecast

It should dip below -20C tonight and alpine winds will shift to N/NW up to 65kmh for Wed. Thursday and Friday should only produce trace amounts of snow with slightly warmer temperatures.

Snowpack Summary

15-30cm over the last 24 hours, starting as dense snow which became lighter as temps cooled. Up to 50cm settled storm snow over the last few days. Many areas reporting less accumulation in the alpine. Moderate winds SW to NW creating wind slabs 20-50cm thick in the alpine, The basal Oct. crust can still be found on polar aspects in the alpine.

Avalanche Summary

Avalanche work at Sunshine produced avalanches to size 2 on many different aspects, one of which stepped down to the Oct. crust in a previously uncontrolled alpine area. Less snow reported at Lake Louise, and less activity seen. Limited visibility, but some naturals were observed to size 2.5 on Pilot Mtn. during a clearing.

Confidence

Due to the number of field observations on Tuesday

Regioni coperte