Avalanche Forecast Banff Yoho & Kootenay National Park

Date Issued: Valid Until:

Parks Canada snow safety, Parks Canada

Avalanche Forecast

Sat May. 4th ยท 4:00PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low
Persistent Slabs Persistent Slabs
Wind Slabs Wind 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

Localized snow amounts may vary at higher elevations. Deeper areas could release larger than expected avalanches.

Weather Forecast

Mixed sun and cloud with isolated convective flurries or rain at lower elevations is forecasted through the weekend with light to moderate SW wind.

Snowpack Summary

5 to 30 cm of new snow and recent winds have created soft slabs in immediate lees in the alpine. Moist snow observed on solar aspects, but alpine north aspects are staying dry. Concern still exists for a facet layer down 30-50 cm which is producing clean shears with snow-pit tests and has been reactive to skier triggering.

Avalanche Summary

No new avalanches were reported today.

Confidence

Problems

Persistent Slabs

Persistent Slabs

Though not widespread, where this layer does exist ,expect it to be most reactive in areas where a slab sits over previously formed crusts. On Tuesday we observed several large skier triggered and natural avalanches fail on this layer.

  • Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 2.5
Wind Slabs

Wind Slabs

Continued precipitation and moderate winds have formed small pockets of wind slab in immediate lee features at higher elevations. Though in many areas these slabs will be small, localized areas of heaver accumulations may have formed larger slabs.

  • Use caution in lee areas. Wind loading could create slabs.
  • The new snow will require several days to settle and stabilize.

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

Elevations: Alpine.

Likelihood

Possible - Unlikely

Expected Size

1 - 2
Loose Wet

Loose Wet

If the sun comes out for any length of time expect loose wet avalanches out of steep sun exposed terrain.

Aspects: South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood

Likely - Possible

Expected Size

1 - 1.5