Bollettino valanghe

Jasper

Apr 4 – 5, 2013Parks Canada
Vedi sulla mappa
Archiviato · scaduto 13 years ago

Pericolo valanghe

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

In sintesi

Up to 20cm of new snow has been forecast over the next 24 hours. There will be good skiing in sheltered treeline locations.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    These heavy and unstable features can fall unexpectedly triggering deep large avalanches. With snow and SW winds forecast the significants and impact of these features should not be overlooked.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    With up to 20cm of new snow due tonight and tomorrow along with moderate SW winds we are anticipating soft storm slabs to be forming at upper elevations. Slab bonding is expected to be touchy on the current sun and temperature crusts.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Cooling temperatures have reduced the magnitude, frequency and distribution of these events. Pay close attention to the increasing air temperature and the thickness of the melt freeze crust. Rain events will increase the elevation range and aspect.

Confidence

Track of incoming weather systems is uncertain

Weather Forecast

Starting this evening light rainfall will transition into snow. Amounts will be greatest at upper elevations where over the next 24 hours 20cm may fall.  Winds will  be light out of the NE at lower elevations and moderate SW near ridge tops gusting strong. The overnight temperatures may not allow for good crust formation at mid treeline elevations.

Snowpack Summary

Below Treeline a supportive 15cm melt freeze crust provides temporary stability above a wet and unconsolidated snowpack. The crust thins with elevation and on slopes which are not South facing. By mid afternoon, or earlier on very hot days, this crust will melt and the avalanche danger will elevate considerably. The base of the snowpack is weak.

Avalanche Summary

Evening rain may see a short lived spike in wet avalanches at lower elevations this evening. The falling temperatures will put a stop to this as the rain transitions to snow. Ridge top winds will produce soft slabs with the new snow and where this happens to fall on an established melt freeze crust bonding will likely be poor, at least initially.

Regioni coperte