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Avalanche Forecast

Archived

Jan 30th, 2020–Jan 31st, 2020

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

Regions

Glacier.

Investigate how the new snow is bonding to the old surface, noting slab formation or stiffer feeling snow. Be weary on Southerly aspects if the sun stays out today, and cross-loaded terrain features at higher elevations.

Weather Forecast

Cloudy with sunny periods today, no precipitation expected, light to mod winds from the South, and FL rising to 1200m. On Friday, an atmospheric river will begin to set up over Rogers Pass. Copious amounts of precipitation are expected and freezing levels will rise further to 2000m by Friday night.

Snowpack Summary

20cm of new snow overnight, coupled with moderate to strong winds likely formed storm slabs in cross loaded terrain and immediate lees. The mid and lower snowpack is well settled, all of our persistent weak layers are currently dormant; however, they will be tested on Friday and Saturday if we receive the 80mm of precip, high FL and strong wind.

Avalanche Summary

No new avalanches were observed in the Highway Corridor or reported from the Backcountry yesterday. This morning we received a report of 3 natural avalanches in the Connaught drainage, that likely occurred last evening. Frequent Flyer size 1.5 stopping above the skin trail, Cheops Nth 4 size 2.5, and Cheops Nth 1 size 1.5.

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.