Bollettino valanghe

Lizard-Flathead

Mar 23 – 24, 2018Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

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

In sintesi

Strong winds are driving the alpine danger to CONSIDERABLE. Watch for whumphing and cracking below your feet and continue to make observations while gaining elevation towards alpine terrain.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    Changing winds from East-West continue to be strong, redistributing the recent storm snow onto most aspects. Wind slabs will likely be reactive to skier/rider triggers and loose dry avalanches may occur from steeper terrain features.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2.5
    Large looming cornices exist across ridgelines. Cornices are unpredictable and demand respect. They're more likely to fail during wind events or if the sun comes out.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

Saturday: Mainly cloudy. New snow 5-10 cm accompanied by strong southwest ridgetop winds. Alpine temperatures near -2 and freezing levels 1200 m.Sunday: Mix of sun and clouds. Ridgetop wind strong from the West and freezing levels near 1400 m.Monday: Cloudy with some sunny periods and isolated flurries. Ridgetop wind generally light with strong gusts from the southwest. Alpine temperatures near -4 and freezing levels 1400 m.

Avalanche Summary

On Friday, numerous natural storm slab avalanches were reported from North aspects above 1700 m. I suspect with the strong winds and new on Saturday this problem may persist.

Snowpack Summary

Up to 20 cm of new snow will initially have a poor bond to the plethora of old snow surfaces including a melt-freeze crust on sunny aspects, surface hoar on north aspects above 1600 m and moist snow surfaces below 1600 m. Wind slabs are building on most aspects due to the changing winds and overhanging cornices exist along ridgelines. Deeper in the snowpack, the mid-December and late-November weak layers are composed of crusts and sugary facets, which are down 150-300 cm. These layers are currently dormant.

Regioni coperte