Bollettino valanghe

South Coast Inland

Feb 26 – 27, 2021Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 6 years ago

Pericolo valanghe

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

In sintesi

New snow and wind have formed reactive storm slabs at all elevations. Conservative terrain choices will be critical to playing safe on Friday.

Expect hazard to be HIGH in portions of the region that receive 20 cm. or more snow Thursday night.

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    Cornices are large, looming, and require extra caution under the current conditions.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–2.5

    New snow and wind have formed touchy storm slabs reactive to human triggers; especially in wind affected terrain.

Weather Forecast

  

THURSDAY NIGHT: Snow; 5-15 cm. for most of region except up to 25 cm. in Coquihalla area / Strong, northwest ridgetop wind / Alpine low -12 / Freezing level 500 m.

FRIDAY: Cloudy with isolated flurries; 0-3 cm. / Light, northwest ridgetop wind / Alpine high -6 / Freezing level 900 m.

SATURDAY: Mix of sun and cloud / Light, northwest ridgetop wind / Alpine high -7 / Freezing level 800 m.

SUNDAY: Cloudy with isolated flurries; 0-3 cm. / Strong, southwest ridgetop wind / Alpine high -3 / Freezing level 1400 m.

Confidence

Moderate - Uncertainty is due to the timing, track, & intensity of the incoming weather system. Forecast snowfall amounts are uncertain.

Avalanche Summary

No new avalanches were reported in this region on Wednesday. However, the incoming snow and strong northwest winds are expected to form storm slabs reactive to human triggers; especially in the Coquihalla area where higher snowfall amounts are expected.

Snowpack Summary

Storm slabs formed by 10-20 cm. of new snow and strong southwest shifting to northwest winds have formed storm slabs that are expected to remain reactive to human triggers; especially in wind affected terrain.

A weak layer composed of a crust, facets or surface hoar depending on elevation/aspect is now down 70-120 cm. This layer that was buried in late January continues to be noted in snowpack tests with mixed results. There have been no recent avalanches reported on this layer. Large triggers, such as an avalanche in motion, cornice fall, or intense loading from snow/ wind and/or a rapid rise in temperature can awaken these deeper weak layers.

The lower snowpack is well settled and strong in most areas.

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Use increased caution at all elevations. Storm snow is forming touchy slabs.
  • Expect slab conditions to change drastically as you move into wind exposed terrain.
  • Extra caution is needed around cornices under the current conditions.

Regioni coperte