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

Mar 27th, 2021–Mar 28th, 2021

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

Regions

Sea To Sky.

 There is uncertainty with forecast precipitation amounts Saturday night through Sunday. If snowfall amounts materialize as forecast, then the avalanche danger will certainly be High. 

Confidence

Low - Forecast precipitation (either snow or rain) amounts are uncertain.

Weather Forecast

SATURDAY Night: Snow, accumulation 10-25 cm, moderate to strong southwest wind, treeline temperature around -4 C, freezing level 1100 m.

SUNDAY: Snow, accumulation 15-30 cm, moderate to strong southwest wind, treeline temperatures around -5 C, freezing level 1000 m.

MONDAY: Mix of sun and cloud, light northwest wind, treeline temperatures around -5 C, freezing level 1000 m.

TUESDAY: Mix of sun and cloud, light west wind, treeline temperatures around -3 C, freezing level 1100 m.

Avalanche Summary

A few cornices were triggered naturally and from explosives on Tuesday, Wednesday, Thursday and Friday. They were very large, as is expected at this time of year. Expect to see an increase in storm and wind slab avalanches on Sunday as new snow accumulates and the wind blows strong from the southwest. 

Snowpack Summary

Another 15-25 cm of new snow may have fallen Saturday night. This sits above a widespread melt freeze crust, with the exception of high north-facing terrain. It may also be sitting on small surface hoar crystals reported on north and east aspects in the alpine.

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.

Terrain and Travel

  • Minimize exposure during periods of heavy loading from new snow, wind or rain.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.