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Avalanche Forecast

Archived

Feb 13th, 2022–Feb 14th, 2022

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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

A modest helping of snow in the days to come should help to improve ski quality but may limit travel plans into the alpine with decreased visibility. Good skiing remains in sheltered areas at treeline and above.

Weather Forecast

A low will cross the divide Monday bringing around 5cm through Tuesday morning. Freezing levels should remain at valley bottom. SW winds may reach just into strong values in the alpine early Saturday as the warm front arrives and then increase a bit and shift northwest late in the day as the cold front follows through. Another system will follow..

Snowpack Summary

Extensive wind effect in exposed areas and wind slabs in lee areas at treeline and above. The Jan30 surface hoar/ sun crust interface remains reactive in isolated pockets. New sun crusts on solar slopes into the alpine and a thin temperature crust all aspects to 2100m. Shallow snowpack areas remain weak and faceted.

Avalanche Summary

One example Sunday of a skier remote avalanche at treeline in KNP and a few Saturday of naturals in the alpine in YNP. Visitor Safety staff in YNP observed what looked to be a sz 2.5 Na on NE aspect on Cathedral Crags at 2300m estimated at 200m wide 30-50 deep and at least 24 hrs old.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Tuesday

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.