Avalanche Forecast
Issued: Apr 6th, 2021 3:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Loose Wet and Cornices.
mkoppang,
Avalanche Canada
Wednesday will start off clear before a storm moves in later in the day giving us 20-25cm and strong SW winds. Watch for the winds to increase ahead of the front and make the upper snowpack more windslabby. Start EARLY if you headed out and beat the heat!
Summary
Confidence
Weather Forecast
A cold clear night is forecast overnight tonight with a clear morning on Wednesday. As the day progresses a system will move into the region giving us up to 20cm of snow by Thursday morning. Winds will be strong Wednesday out of the west with the arrival of the front. With spring, when the sun is out watch for intense solar radiation to decrease the stability on the solar aspects.
Avalanche Summary
A recent sz 2 avalanche on Mt Sparrowhawk that was cornice triggerred was 40-200cm deep and ran for close to 200m crossing the regular uptrack. This was one of the deeper avalanches that has occurred recently. There were also a few loose wet avalanches on steep solar aspects later in the day.
Snowpack Summary
Winds were light on Tuesday and as a result there wasnt much change in the current snowpack structure. 10-12cm of snow is overlying a variety of different snow surfaces in the alpine with isolated windslabs at cols and crossloaded features. With winds increasing on Wednesday, these slabs may become more reactive and easier to find. Surface snow was moist by midday on solar aspects. At treeline and below travel is fast in the morning on surface crusts and mushy in the afternoon. Early starts with careful consideration of overhead hazards already in the sun is critical.
Terrain and Travel
- Avoid steep convex slopes.
- Cornices become weak with daytime heating or solar exposure.
- Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
Problems
Wind Slabs
Isolated windslabs are being found at Cols and on crossloaded features. As winds increase on Wednesday they may become more widespread.
Aspects: North, North East, East, South East, South, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
When the sun comes out expect a quick deterioration on solar aspects. Freezes have been marginal down low lately, which also contributes to the quick change.
Aspects: South East, South, South West, West.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
With intense solar radiation and warm daytime temperatures, cornices will become fragile. Simple answer is: stay away.
Aspects: North, North East, East, South East, South, South West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 7th, 2021 3:00PM
