Avalanche Forecast Jasper National Park

Date Issued: Valid Until:

Parks Canada jasper snow safety, Parks Canada

Avalanche Forecast

Tue Apr. 23rd ยท 4:16PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low
Wind Slabs Wind Slabs
Persistent Slabs Persistent Slabs
Loose Wet Loose Wet

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low

The recent winds have left windslabs in immediate lee features in the alpine & upper treeline.

Weather Forecast

Wednesday: Broken skies and slightly cooler temps -10 in the alpine along with moderate west winds. Trace precip. Freezing Level 1700M

Thursday: The skies should clear and give a excellent overnight recovery with lows in the -15 range. Winds will be generally light westerly.

Friday: Warmer temps -6 and cloudy skis, Freezing level to rise to 2100M

Snowpack Summary

Previous moderate to strong south westerly winds have created Fresh wind slabs in immediate lee features in the southern part of the bulletin region. this snow now overlies several crusts / facet layers in the upper 40cm, and a faceted layer down 70cm on shady aspects. Expect isothermal snow at lower elevations (below treeline).

Avalanche Summary

Recent whumfing in low angle alpine terrain.

1 size 1.5 Steep N aspect alpine, cornice triggered windslab that appears to have stepped down to a persistent layer.

Confidence

Problems

Wind Slabs

Wind Slabs

Continued winds Tuesday redistributed recent storm snow to lee features combined with new snow, and warm temperatures.

  • Use caution in lee areas in the alpine and treeline. Recent storm snow has formed wind slabs.
  • Watch for whumphing, hollow sounds and shooting cracks.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood

Likely - Possible

Expected Size

1 - 2
Persistent Slabs

Persistent Slabs

New load with warm temps could increase the likelihood of triggering.

  • Note recent avalanche activity.
  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3
Loose Wet

Loose Wet

Cooling weather on Wednesday should keep the snow cold. Watch out for sunny periods and slopes catching the sun.

  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects: All aspects.

Elevations: Below Treeline.

Likelihood

Possible

Expected Size

1 - 1.5