Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Feb 12th, 2023–Feb 13th, 2023

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

Regions

Glacier.

Strong winds and overnight snow will promote storm slab formation Monday morning.

Natural avalanche activity is likely Sunday night through Monday.

Confidence

Moderate

Avalanche Summary

Several sz 2-3 natural avalanches were reported from the backcountry Saturday.

Cheops North 4 had a loose avalanche step down to the storm slab interface lower in the path.

A sz 2.5 cornice failure off Mt Bonney scrubbed the face below down to glacier ice.

Snowpack Summary

This past week's 60cm of storm snow and strong SW winds have formed several potential failure planes in the upper snowpack, especially in wind exposed areas.

The mid-snowpack consists of generally well bonded, rounded grains.

The Nov 17 deep persistent weak layer, composed of large facets and in some locations a decomposing crust, has been dormant in GNP for several weeks now.

Weather Summary

A vigorous frontal system plows through Rogers Pass Sunday night, bringing strong winds, snow, and mild temps.

Tonight: snow, 20cm, Alp low -8*C, mod/gusting strong SW winds, 800m FZL

Mon: convective flurries, trace to 5cm, Alp high -8*C, light/gusting moderate W winds, 1000m FZL

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

Terrain and Travel Advice

  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.
  • 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.