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Archived

Avalanche Forecast

Apr 8th, 2021–Apr 9th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
3: Considerable
The avalanche danger rating in the alpine will be considerable
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: Jasper.

Avalanche control plannedon Hwy 93N on Friday between Parkers summer and Big Bend, follow AB 511 for up to date information. The Icefields region remains wintery and good travel and riding can be found, mostly in sheltered areas.

Weather Forecast

Thursday night: Cloudy with clear periods and isolated flurries.Trace. Low -11 °C.Friday: Flurries. Accumulation: 6 cm. Alpine temperature: High -7 °C. Ridge wind southwest: 20 km/h gusting to 50 km/h. Freezing level at valley bottom. Saturday: Scattered flurries. Risk of a thundershower. Accumulation: 4 cm.  Low -12 °C, High -9 °C.

Snowpack Summary

Up to 25cm of new snow with light winds. Snowpack shows strength and bonding in field tests; recurring instabilities are found close to surface. We are most concerned about potential to trigger deeper, persistent slabs (Fc, DH), especially as the snowpack changes with typical spring inputs (rain, sun, wet snow).

Avalanche Summary

A road patrol south today noted numerous loose dry avalanches. Most importantly, our field teams have observed few large slides running within deeper instabilities. One large slide of size 3 was observed today in Churchill slide path, a popular ski destination to many.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Wind Slabs

Significant snow is available for transport at all elevations, additional inputs forecasted. Expect wind slabs to be reactive to human triggering.

  • Be careful with wind loaded pockets, especially in steep confined alpine terrain.
  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Loose Dry

Solar input may trigger loose dry slides within new snow.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 1.5

Deep Persistent Slabs

Isolated large events continue to sporadically happen. Keep in mind the overhead exposure these slides my pose to lower elevation.

  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
  • Minimize overhead exposure during periods of heavy loading from new snow, wind.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5