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Avalanche Forecast

Archived

Feb 13th, 2023–Feb 14th, 2023

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

Regions

Glacier.

Wind-affected slopes will demand caution, as storm slabs lurk at ridgeline and across open, exposed slopes.

The sun is packing a bit more punch these days. Solar aspects may see increased avalanche activity the next few days with its appearance.

Confidence

Moderate

Avalanche Summary

A natural avalanche cycle Sunday night/Monday morning saw numerous slab avalanches from sz 2-3.5. Ross Peak, Gunners, and Cougar Creek West paths had notable avalanches, with debris out on their fans at valley bottom.

Snowpack Summary

Strong SW winds and 30cm of overnight snow have formed a storm slab in lee and crossloaded features at Alpine/Treeline elevations. Sheltered areas hold deep, unconsolidated powder.

A thin sun crust was observed on steep S'ly aspects Monday from the short sunny period in the am.

The Nov 17 deep persistent weak layer has been dormant in GNP for several weeks now.

Weather Summary

Convective flurries will give way to a cool, clearing trend over the next few days.

Tonight: Clear periods, Alp low -11*C, light N winds

Tues: mix of sun/cloud, Alp high -10*C, light NW winds

Wed: sun and cloud, Alp high -11*C, light W winds

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Use small low consequence slopes to test the bond of the new snow.
  • Avoid exposure to slopes that have cornices overhead.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.