Bollettino valanghe

South Coast

Jan 31 – Feb 1, 2018Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

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

In sintesi

Significant accumulations of new snow are expected on Wednesday and Thursday. If winds are strong, the avalanche Danger may be HIGH.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5
    Recent heavy snowfall and high winds have created fragile new cornice growth. These monsters may surprise with nasty consequences. Use extra caution around ridge crests.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–2
    New snow and wind on Wednesday night are expected to form new storm slabs at all elevation bands. The new snow may be surprisingly reactive at lower elevations due to underlying crusts.

Snowpack Summary

Heavy rainfall soaked the upper snowpack at most elevations over Sunday night and Monday. High alpine elevations in areas like Sky Pilot and the Chehalis Range may have seen thick new storm slabs develop over the same time period. Below these elevation-dependant surface conditions, storm snow totals from the past week reached 110-180 cm. The crust that exists beneath these recent snow accumulations is likely to have now formed a solid bond to the overlying snow.

Confidence

Moderate - Wind speed and direction is uncertain on Thursday

Weather Forecast

Wednesday Night: 15-30cm of new snow / Moderate southwest winds / Freezing level at 800mThursday: 5-10cm of new snow / Moderate southwest winds / Freezing level at 1000mFriday: 20-30cm of new snow / Light southwest winds / Freezing level at 1300mSaturday: Light flurries / Light and variable winds / Freezing level at 2000m

Avalanche Summary

Areas that experienced recent heavy rain should see the snowpack quickly stabilize as temperatures cool. With that said, new snow that accumulates on this refrozen surface may form unstable new storm slabs before the new snow has a chance to form a solid bond. High alpine areas that haven't seen rain are on a different trajectory. Here, recently formed storm slabs will need more time to stabilize as they experience continued loading from new snow and wind.Looking forward, new snow and wind on Wednesday night is expected to promote a new round of storm slab activity in higher elevation lee terrain.

Regioni coperte