Bulletin d’avalanche

Waterton Lakes

Mar 13 – 16, 2022
Voir sur la carte
Archivé · expiré 5 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Freezing levels expected to hover at 1800 m for the next few days and rain is expected Tuesday. Likelihood of loose wet cycle below treeline will increase through the forecasting period.

Assess bond of new snow at higher elevations to old surfaces.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    Extreme winds have created hard windslabs up to 70 cm deep in alpine.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5

    Strong SW winds and 20-30 cm of snow is forecast for Monday, Tuesday. This will create fresh storm slabs that may not bond well to wind slabs. Investigate bond of new snow to old surfaces thoroughly.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Rain is forecasted to 1800m Monday Tuesday. Steep terrain below treeline will likely see wet loose activity on the March 3 melt freeze crust. Watch for signs of pin wheeling.

Weather Forecast

Sunday: Mainly cloudy with isolated flurries. Moderate to strong SW winds. Alpine high -3. Freezing level 1800m.

Monday: Flurries, 9 cm accumulation. Strong SW winds. Alpine high -3, low -7. FL 1400m.

Tuesday: Periods of snow, 17 cm accumulation. Moderate gusting extreme SW winds. Alpine high -3, low -7. FL 1800m.

Snowpack Summary

Extreme SW winds and warm temps have pressed surface snow and created windslabs up to 70cm deep in alpine. This overlies old windslabs and the March 3 rain crust. An additional 50 cm of settling snow over the Feb 15 crust that exists up to 2000m. Lower snowpack is well settled 1F to P. HS 250-300 cm near the continental divide.

Avalanche Summary

A Na size 2.5 wind slab avalanche was observed on Bertha peak on March 12. Several other wind slab avalanches to size 3 were reported in the park this week. As always keep those Mountain Information Network observations coming.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes