Bollettino valanghe

Kootenay Boundary

Apr 13 – 14, 2021Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 5 years ago

Pericolo valanghe

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

In sintesi

Warm temperatures and sunshine will weaken cornices and the snowpack. Avoid exposure to sun exposed slopes and cornices, especially in the afternoon. 

Check out the latest Forecaster's Blog for more detailed information on managing these conditions.

Problemi valanghivi

  • Wind Slabs

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

    Wind slabs in lee terrain may still react to human triggers. 

  • Cornices

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

    Cornices are at their largest at this time of year, and become weaker with warm temperatures and solar radiation.

  • Loose Wet

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

    Surface snow will tend to lose cohesion and become unstable with solar warming during the day. Avoid exposing yourself to terrain where a small wet loose avalanche could have big consequences.

Confidence

Moderate - Uncertainty is due to how the snowpack will react to the forecast weather.

Weather Forecast

A ridge of high pressure, with sunny skies and high freezing levels will dominate the weather pattern this week.

Tuesday night - Mainly clear / moderate northeast wind / alpine low temperature near -1 / freezing level 1500 m, possible alpine temperature inversion

Wednesday - Mainly sunny / light to moderate northeast wind / alpine high temperature near 1 / freezing level 2500 m 

Thursday - Mainly sunny / moderate northeast wind / alpine high temperature near 2 / freezing level 2700 m 

Friday - Mainly sunny / light northeast wind / alpine high temperature near 3 / freezing level 2900 m

Avalanche Summary

There were a few size 1-1.5 human triggered wind slab avalanches reported over the past week. Small natural dry loose avalanches were also reported in the Kootenay Pass area.

Looking forward, wet loose avalanches are expected on steep solar aspects with sunny weather and rising freezing levels. Cornice failures will also become more likely. Wind slabs may remain reactive in leeward terrain featuresat upper elevations.

Snowpack Summary

A crust exists on the surface on solar aspects, and on all aspects up to about 1800 m. Dry snow can still be found on north aspects at higher elevations. Sunshine and rising freezing levels are expected to soften the surface crust during the day. The mid and lower snowpack are well settled and strong.

Terrain and Travel

  • Avoid sun exposed slopes, especially if snow surface is moist or wet.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.
  • Cornices become weak with daytime heating or solar exposure.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Carefully evaluate steep lines for wind slabs.

Regioni coperte