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Avalanche Forecast

Archived

Jan 26th, 2023–Jan 27th, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

The region continues to see small amounts of overnight precipitation and northwesterly winds. Watch for newly formed reactive wind slabs as you transition into wind-affected terrain.

Confidence

High

Avalanche Summary

On Wednesday, we received a MIN report of a skier accidental avalanche from Nak Bowl. The avalanche happened when skiing over a convexity and likely released on a crust below the storm snow. A natural size 2.5 wind slab avalanche was also reported from Nak Peak area. This avalanche is suspected to have stepped down to deeper layers. Several loose avalanches were observed up to size 2 on south aspects from solar input and elevated freezing levels.

On Tuesday, several, size 1, natural loose dry avalanches were reported from within the storm snow.

Thank you for all the MINs, please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

30-40 cm of storm snow at alpine and treeline is being redistributed into deep pockets at higher elevations. Below 2000 m supportive crust is found 50 cm deep.

Generally, the snowpack is well-settled. Weak layers exist within the mid and lower snowpack but the thick crusts sitting above them make triggering avalanches on these layers unlikely.

Snowpack depths are roughly 150 cm at treeline and taper rapidly below 1500 m.

Weather Summary

Thursday Night

Mainly cloudy. Northwesterly ridgetop winds 40-60 km/h. 1500m temperature low of -2C. Freezing levels of 1000 m.

Overnight, cloudy with scattered flurries, 5-10 cm accumulation.

Friday

Mix of sun and cloud. Light northwesterly winds occasionally gusting to 30 km/h. 1500m temperature high of 0C. Freezing levels of 1500 m.

Saturday

Sunny with cloudy periods. Light northeasterly winds occasionally gusting to 40 km/h. 1500m temperature high -6C. Freezing levels of 800 m.

Sunday

Sunny. Moderate northeasterly winds occasionally gusting to 40 km/h. 1500m temperature high -12C. Freezing levels valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Use ridges or ribs to avoid areas of wind loaded snow.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.