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Archived

Avalanche Forecast

Apr 29th, 2017–Apr 30th, 2017
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Banff Yoho Kootenay.

Good ski conditions continue. Watch for the quality of overnight freeze on your tour, and be off sun affected slopes early. Triggering of the deep persistent layer is currently going to be from a heavy load (cornice) or with high solar input. SH

Weather Forecast

5-10cm overnight along the divide and only a few cm to the East with mainly cloudy skies for the first part of Sunday.  A mix of sun and cloud for the afternoon. 

Snowpack Summary

30-50cm of settled snow from this past week. There are a variety of melt freeze crusts in the upper snow pack on all aspects and elevations except for due north above 2300 m. A basal weakness remains at the bottom of the snow pack. It is currently only reactive to large triggers like cornices but may wake up with solar warming.

Avalanche Summary

No new avalanches observed Saturday.

Confidence

Avalanche Problems

Loose Wet

Clearing skies Sunday afternoon will moisten the new snow on solar aspects increasing the likelihood of loose wet avalanches.
If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.Pay attention to sluffing off cliffs and steep solar terrain, signs of a warming snowpack.

Aspects: North, North East, East, South East.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices continue to fail especially with daytime heating. Minimize your time underneath these and remember that a cornice failure could also trigger the deep persistent slab on the basal facets.
Give cornices a wide berth when travelling on or below ridges.Cornices become weak with daytime heating, so travel early on exposed slopes.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3

Deep Persistent Slabs

The weak basal facets can produce large avalanches with large triggers or heat. Remember that the snowpack is generally strongest when it is cool and stick to planar, supported slopes with a deeper snowpack when entering steep terrain.
Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4