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

Jan 2nd, 2020–Jan 3rd, 2020

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

Regions

Glacier.

Natural avalanches have tapered off in the last 12 hours; however, human triggered avalanches remain likely. Avalanches were running full path yesterday, and could easily do the same today!

Weather Forecast

A brief reprieve from the recent onslaught of precipitation today; however, the heavy precipitation has been replaced by strong Southerly winds. Expect cooler temperatures today, and a mix of sun and cloud. Tomorrow a upper level warm front passes over Rogers Pass depositing another 20cm, strong to extreme wind and rising temperatures.

Snowpack Summary

50-70cm of storm snow now sits on the Dec 27th surface hoar. Strong S-SW winds are redistributing the storm snow on lee features in the Alpine and exposed areas of Treeline. The mid and lower snowpack has been settling and gaining strength; however, the Dec 11th surface hoar (5-12mm) still persists down 120-160cm.

Avalanche Summary

Widespread natural and Artillery triggered avalanche cycle yesterday up to size 3.5, all aspects and elevations. Numerous Naturals observed in the Highway Corridor (limited observations, due to poor visibility). 70 Artillery rounds fired, with good results. Some paths ran sympathetically to size 3.

Confidence

Timing or intensity of solar radiation is uncertain

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.