Avalanche Forecast Jasper National Park

Date Issued: Valid Until:

Parks Canada timothy johnson, Parks Canada

Avalanche Forecast

Wed Apr. 24th ยท 4:00PM

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 Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Watch for building wind slabs in the alpine.

Weather Forecast

Parker Ridge:

A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: High -2 C.

Ridge wind west: 10-20 km/h.

Freezing level: 2100 metres.

Snowpack Summary

Ongoing moderate to strong westerly winds have created fresh wind slabs in immediate lee features. This snow now overlies several crusts / facet layers in the upper 40cm, and a faceted layer down 70cm on shady aspects. Expect unsupportive slush 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

Timing, track, or intensity of incoming weather system is uncertain on Friday

Problems

Wind Slabs

Wind Slabs

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

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

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2
Persistent Slabs

Persistent Slabs

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

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

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

Elevations: Alpine.

Likelihood

Possible - Unlikely

Expected Size

1.5 - 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