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Archived

Avalanche Forecast

Apr 3rd, 2023–Apr 4th, 2023
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Bow Valley, Highwood Pass, Kananaskis, North 40, Spray - KLakes.

Good skiing continues to be found on North aspects. Two fresher looking avalanches along tent ridge.

Confidence

Moderate

Avalanche Summary

1 fresh crown reported on a Min on tent ridge, a fresh looking size 2 windslab in the tent bowl. Otherwise no new observed or reported.

Snowpack Summary

Roughly 10cm of snow has fallen since Saturday morning. This is settling rapidly. Anything with a hint of solar exposure now has a 3-5cm crust. Valley bottom is still unsupportive underneath the crust. The surface crust extends to at least 2200m and even higher on south and southwest slopes. At about 2000m there's a bit more structure and the snowpack is supportive. This is where the trouble layers start to become more apparent. The weak facet and depth hoar is down about 60-80cm at treeline and the weak basal layers are down about 120-150cm. Today small convective flurries throughout the area, But no real accumulation.

Weather Summary

Tuesday is looking to be mostly cloudy with scattered flurries. Up to 5cm. Day time highs of -9 and 10-20 km Southwest winds.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.

Avalanche Problems

Deep Persistent Slabs

Thin, shallow areas or heavy triggers are what will set this layer off. Avoid terrain with those characteristics. Intense solar radiation and daytime heating may wake up this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3.5

Persistent Slabs

There are two layers of concern here: 1) a buried sun crust (on solar) and facets (on polar) down 20-40cm, and 2) a facet/depth hoar layer down 80-100cm that was buried mid season. These layers have become more active within the recent additional snow load, and are more prone to triggering during periods of intense solar radiation.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1.5 - 2.5