Avalanche Forecast
Issued: May 3rd, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs, Wind Slabs and Loose Wet.
lisa paulson,
Parks Canada
Localized snow amount may very at higher elevations. Deeper areas could develop larger then expected wind slabs.
Summary
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
Small wet loose avalanches have been observed on solar aspects. Tuesday our field team observed several natural and skier triggered avalanches in the Observation Peak area. These avalanches were triggered on the persistent problem down 40 cm.
Confidence
Problems
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
Expected Size
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
Expected Size
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
Expected Size
Valid until: May 4th, 2019 4:00PM
