Avalanche Forecast
Issued: Feb 22nd, 2017 4:11PM
The alpine rating is Storm Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Moderate - Due to the number of field observations
Weather Forecast
We're into a stable and benign weather pattern with cooling temperatures and isolated flurries.THURSDAY: Cloudy with sunny breaks and isolated flurries / Light variable winds / Freezing levels at valley bottom / Alpine high temperatures near -7 Celsius.FRIDAY: A mix of sun and cloud and isolated flurries / Light variable winds / Freezing levels at valley bottom / Alpine high temperatures near -8 Celsius.SATURDAY: Cloudy with light flurries in the afternoon (local accumulations 5-10cm possible) / Light southwest winds / Freezing levels at valley bottom / Alpine high temperatures near -7 Celsius.
Avalanche Summary
On Tuesday ski tourers near Kimberley remote-triggered a Size 2 wind slab on a southeast aspect near 2600m.On Monday afternoon we had three spooky large avalanches: one natural and two triggered by humans:1) A Size 2.5 persistent slab (40-75cm thick) near Golden was triggered by a skier on a northeast aspect near 2300m. See here for this great MIN post.2) A Size 3 persistent slab (50-120cm thick) near Golden was remote triggered by a touring party on a southeast aspect near 2300m.3) A Size 2.5 persistent slab (30cm thick) near Invermere ran naturally on a north aspect near 2600m.Storm slabs from recent snowfall remain sensitive to light triggers and have the potential to step down and trigger persistent slab avalanches.
Snowpack Summary
We've had minor snowfall amounts (10-25cm) over the past several days (and some higher amounts in the south) with moderate southerly winds in some locations. Expect to find 25-40 cm of more recent snow bonding slowly to buried Feb 15th surface hoar and/or a sun crust, and blown into wind slabs at higher elevations. Storm snow from previous weeks is still bonding poorly to the Feb 3rd surface hoar / sun crust layer, which is now down 60-80 cm.At 2000m and below a (supportive) melt-freeze crust can be found on almost all elevations and aspects. The sun is starting to pack a punch and can trigger loose snow avalanches mid-day. The sun is also creating a thin crust on steep southerly aspects.A persistent weakness buried mid January is now down 80-150 cm and the November crust is down around 180 cm. These deep persistent weaknesses still have the potential to wake up and become reactive with human triggers. (See MIN post above).
Problems
Storm Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Feb 23rd, 2017 2:00PM