Bollettino valanghe

Lizard-Flathead

Mar 22, 2019Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

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

In sintesi

Naturally triggered loose wet avalanches remain likely on Friday. Avoid sun exposed slopes during the heat of the day.

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2.5
    Sunshine and warm temperatures are peeling away layers of recent snow on sunny slopes as loose wet slides. Many recent loose wet avalanches have been entraining mass by gouging into the snowpack or triggering slabs.

  • Wet Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–3
    As the upper snowpack becomes moist or wet with warm temperatures and sunshine, the chance of wet slabs failing on weak, faceted snow in the mid snowpack increases. This repetitive stress test will be underway once again on Thursday.

Confidence

High -

Weather Forecast

THURSDAY NIGHT: Clear skies / Light, southeasterly winds / Alpine low 6 C / Freezing level 3000 m.FRIDAY: Sunny / Light, westerly winds / Alpine high 6 C / Freezing level 2800 m.SATURDAY: Mix of sun and cloud / Light, northerly winds / Alpine high 0 C / Freezing level 2400 m.SUNDAY: Snow/rain; 5-10 mm.  / Light, southeasterly winds / Alpine high -3 C / Freezing level 1700 m.

Avalanche Summary

Wednesday's reports show continued loose wet avalanches reaching size 2 on sun-exposed aspects. Several avalanches that began as loose wet point releases, then triggered small slabs which entrained or gouged out additional mass, significantly increasing the size and destructive potential of the avalanche.Reports from Sunday and Monday showed a continuation of natural loose wet avalanche activity focused on sun exposed aspects, with some releases reaching size 2.5 as they gouged into the snowpack to entrain more mass. Several large persistent slab releases have also been noted failing on large alpine features and reaching size 2.5. Failure planes in these events seem to indicate faceted snow in the mid-snowpack. At least one northeast aspect was included in these reports, suggesting some increasing potential for shaded aspects.Natural avalanche activity is expected to continue until things cool off a bit.

Snowpack Summary

Upper snowpack: Getting warm and moist during the day, maybe forming weak crusts overnight that deteriorate during the day. On sunny aspects the upper snowpack has become increasingly isothermal (slushy and cohesionless) with successive days of warming. Mid-pack: The mid-snowpack consists of weak facets (sugary snow). Recent loose wet avalanches have been gouging into this faceted snow and entraining additional mass. Occasional slab fractures have also initiated above these facets.The lower snowpack has recently been reported to be strong in deep snowpack regions, but its strength is in doubt in shallow areas where the long, cold drought in February weakened the basal (bottom of the snowpack) layers. Some of the largest recent slab avalanches have initiated in shallow snowpack areas in the alpine.

Regioni coperte