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 22nd, 2025–Feb 23rd, 2025

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

Regions

Glacier.

The storm slated to hit Rogers Pass will heavily load the persistent weak layers and a natural avalanche cycle is expected.

Human triggered avalanches are very likely. Travel in avalanche terrain is not recommended.

Confidence

Low

Avalanche Summary

Artillery avalanche control is planned Saturday night.

Natural avalanches were observed in the park up to size 2.5 on Saturday. Avalanche activity is expected to increase overnight Saturday with the forecast for heavy snowfall.

Avalanches may run further than anticipated as the new storm slab sits on a layer of facets.

Snowpack Summary

20-30cms of heavy new snow sits on a faceted upper snowpack from the previous cold snap. Surface snow is moist and sticky below 1450m.

A weak layer of surface hoar, facets and/or suncrust (Jan 30th) is 20-50cm down. This layer is still easy to pick out in pitwalls and produces results in tests. Watch out when this layer gets overloaded!

The mid & lower snowpack is well settled & strong.

Weather Summary

Weather models are struggling with snowfall amounts, but they do seem to agree either moderate or heavy snowfall is possible.

Tonight 16cm. Alpine low -4°C. Ridge winds SW gusting to 65km/hr. Freezing Level (FZL) 1400m

Sun 5cms. Alp high -3°C. Ridge wind SW 20km/h gusting 60. FZL 1500m

Mon 10cms. Alp high -4°C. Ridge wind SW20km/hr gusting 80. FZL 1400m

Tues 7cm. Alp high -3°C. Ridge wind SW 15km/hr. FZL 1400m

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Stick to non-avalanche terrain or small features with limited consequence.

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.

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.