Bollettino valanghe

Northwest Coastal

Dec 21 – 22, 2022Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 4 years ago

Pericolo valanghe

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

In sintesi

Strong outflow winds are expected to continue to affect all elevations.

Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Wind slabs exist in the alpine and open areas at treeline elevations due to reverse loading created by strong outflow winds. Winds slabs could overlie a weak layer of surface hoar, facets, and/or a crust. Any avalanche in the upper snowpack has the potential to scrub down to these deeper weak layers, making for larger-than-expected avalanches. This is especially relevant at treeline elevations, where surface hoar is more likely larger and better preserved.

Confidence

Moderate

Avalanche Summary

No avalanches have been reported in these areas. If you venture into the backcountry, please consider submitting a MIN report, as it helps to strengthen our data gathering.

Snowpack Summary

Surfaces at upper elevations are highly wind-affected and variable due to switching winds. In some parts of the region, a crust exists on south aspects. Now-faceted snow still exists in protected areas at lower elevations.

A layer of large surface hoar crystals, buried in early December, is found down 20 to 50 cm. This layer has been producing small but remotely-triggered avalanches recently. Continued reverse-loading is increasing the likelihood of triggering these slabs.

The lower snowpack is well consolidated above the mid-November crust, found at treeline below 1200 m.

Weather Summary

The same story continues with the bitterly cold arctic air mass over the region. Gusty outflow winds through the coastal inlets and extremely cold temperatures are expected to persist through Thursday night. An abrupt change in the weather pattern is expected for the weekend.

Tuesday night

Mainly sunny. No precipitation. Northeasterly wind 30 km/h at ridge tops. Low of -24˚C.

Wednesday

A mix of sun and clouds. No precipitation. Northeasterly wind 45 km/h at ridge tops. High of -24˚C.

Thursday

Mostly cloudy. Isolated flurries. Northeasterly wind 20 km/h at ridge tops. High of -20˚C.

Friday

Snow 15-20 cm. Southwesterly wind 50 km/h at ridge tops. High of -18˚C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be carefull around freshly wind loaded features.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.

Regioni coperte