Avalanche Forecast
Issued: Mar 9th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
JSmith,
Avalanche Canada
Lingering wind slabs may remain reactive to human triggers in the alpine. Steep, rocky, cross loaded features below alpine ridgetops are some of the most likely places to trigger wind slabs.
Summary
Confidence
High - Confidence is due to a stable weather pattern with little change expected.
Weather Forecast
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TUESDAY NIGHT: Cloudy with isolated flurries; 0-3 cm. / Moderate, southwest ridgetop wind / alpine low temperature -10 / Freezing level valley bottom.
WEDNESDAY: Cloudy with flurries; 2-5 cm. / Light, southwest ridgetop wind / alpine high temperature -6 / Freezing level 700 m.
THURSDAY: Sunny / Light, northwest ridgetop wind / alpine high temperature -4 / Freezing level 1200 m.
FRIDAY: Mix of sun and cloud / Moderate, west ridgetop wind / alpine high temperature -2 / Freezing level 1500 m.
Avalanche Summary
On Monday, evidence of a previous small cornice failure triggering a size 2.5 windslab on a north aspect in the alpine was reported. Additionally, several naturally triggered wet loose avalanches up to size 1.5 were reported on steep, rocky, sun exposed slopes.
On Saturday, at least three large to very large (size 2.5 to 3) wet slab avalanches were observed at low elevation (1100-1400 m) on south aspect slopes, triggered in response to warm temperatures and strong sun.
Snowpack Summary
Up to 25 cm dry soft snow can be found on shaded aspects above around 1500 m. On south-facing slopes and at lower elevations expect crusty snow in the morning and soft moist snow in the afternoon. Winds have slackened off of late, but recent wind slabs and cornices still pose a hazard close to steep ridgelines.
The lower snowpack has strengthened over the past week as previous persistent weak layers have become unreactive. The main layers that we had been tracking were a layer of facets that was buried in mid-February (60-100 cm deep) and a layer of surface hoar and/or a crust that was buried in late January (80-120 cm deep).
Terrain and Travel
- Wind slabs may be poorly bonded to the underlying crust.
- Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Caution around slopes that are exposed to cornices overhead.
Problems
Wind Slabs
You may find pockets of wind slab behind exposed ridgelines in the alpine. Cornices may be present as well.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Mar 10th, 2021 4:00PM
