Bollettino valanghe

Jasper

Mar 12 – 13, 2023Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 4 years ago

Pericolo valanghe

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

In sintesi

Solar effect has been less influential than originally forecast and the snowpack structure has changed very little over the past week. The hazard remains moderate in the alpine and at treeline due to uncertainty regarding the reactivity of our deep persistent slab problem.

Shaded, polar slopes will have better skiing at treeline and below.

Problemi valanghivi

  • Wind Slabs

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

    Previous moderate to strong SW winds have formed wind slabs in exposed areas at tree line and in the alpine.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–3.5

    The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Use caution is thin snowpack areas where human traffic may be able to trigger this layer. Large triggers such as cornice fall or wind slab avalanches may also trigger this layer resulting in large avalanches.

Terrain and Travel Advice

  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Confidence

Moderate

Avalanche Summary

Avalanche control using explosives on Hwy 93N resulted in few wind slabs and numerous loose dry avalanches up to size 2 on Wednesday, March 8.

No new natural avalanche activity observed on Maligne Road or Icefields Parkway today.

Don't forget to post avalanche observations to the MIN.

Snowpack Summary

A weak sun crust can be found on sun-exposed slopes at lower elevations. Wind sheltered areas and sun-protected slopes have 20 to 40cm of low density facetted snow. There is extensive wind effect at tree line and above from previous SW winds.

The mid and lower snowpack is generally weak and faceted with depth hoar lingering at the base. Snowpack depth varies from 60 to 160cm.

Weather Summary

Sunday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -8 °C.

Ridge wind southwest: 10-25 km/h.

Freezing level at valley bottom.

Monday

Snow.

Accumulation: 17 cm.

Alpine temperature: Low -8 °C, High -3 °C.

Ridge wind southwest: 15-35 km/h.

Freezing level rising to 1700 metres.

Tuesday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -17 °C, High -10 °C.

Ridge wind southwest: 15 km/h gusting to 40 km/h.

Freezing level at valley bottom.

Freezing level rising to 1600 metres.

Detailed weather forecasts from Avalanche Canada: https://avalanche.ca/weather/forecast

Regioni coperte