Avalanche Forecast
Issued: Apr 8th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Loose Wet.
ahanna,
Avalanche Canada
Heightened avalanche conditions exist on leeward slopes where new and recent snow has been wind-loaded into reactive slabs.
We will likely see an increase in avalanche danger in the following days with warming temperatures and sun.
Summary
Confidence
Moderate
Avalanche Summary
Wind slabs and cornices were reactive prior to the weekend. Natural and human-triggered wind slabs size 1-2 were reported in the White Hills and Big Level areas. Wind slabs were predominantly on east aspects in the alpine. Natural cornice falls were observed in the Tablelands.
Snowpack Summary
Small amounts of new snow continue to accumulate. Around 10 cm of recent snow sits over wind-hardened surfaces in the alpine and crust at lower elevations.
Snow from earlier in the week appears to be well-bonded to an underlying rain crust but contains a few storm interfaces 20-40 cm deep that remain reactive in snowpack tests. This may include a layer of graupel which could be slow to bond.
The remainder of the snowpack is composed of alternating layers of crusts and wind-hardened snow, effectively bridging any deeper weak layers.
Weather Summary
Saturday night
A trace of new snow. Moderate northwest wind. Alpine low -12 C.
Sunday
Flurries intensifying in the afternoon, accumulating around 5 cm. Moderate westerly wind. Alpine high -8 C.
Monday
5-10 cm overnight then clearing to mostly sunny. Moderate northwest wind. Alpine high -2 C. Freezing level rising to 500 m.
Tuesday
Mostly cloudy. Moderate southwest wind. Alpine high +3 C. Freezing level rising to 1500m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Be especially cautious as you transition into wind affected terrain.
- Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
- The more the snowpack warms-up and weakens, the more conservative you`ll want to be with your terrain selection.
Problems
Wind Slabs
Small amounts of new snow and wind are forming fresh wind slabs in leeward terrain features. They may be especially reactive where they sit over a crust at lower elevations.
In the alpine, older wind slabs may be more stubborn to trigger but given their density and thickness, could potentially have high consequences.
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
After the weekend, as temperatures warm and skies clear, loose wet avalanches will become increasingly likely. Recent soft snow will be especially sensitive upon first exposure to positive temperatures or strong sun. Watch for signs of warming like moist or wet snow, pinwheeling and point releases.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Apr 9th, 2023 4:00PM
