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 6th, 2021–Mar 7th, 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, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

New snow and wind will elevate the avalanche danger. Triggering avalanches at upper elevations is likely, especially in wind-drifted areas. Continue to make conservative terrain choices and steer clear of cornices while the storm snow settles and stabilizes. 

Confidence

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

Weather Forecast

A parade of storms continues through the weekend

Saturday night: Overcast, 5-15 cm of snow, strong south winds, freezing level near 700 m. 

Sunday: Mainly cloudy, 10-20 cm of snow, moderate to strong southwest winds, freezing level near 800 m. 

Monday: Clearing skies, isolated morning flurries with up to 5 cm of snow, light southeast winds, freezing level rising to 1300 m by end of day.

Tuesday: Mainly sunny, light southeast winds, freezing level rising to 1400 m. 

Avalanche Summary

Slabs in the new snow are expected to be touchy at upper elevations, where snow and wind have created conditions that are primed for triggering. 

Cornices may reach their breaking point. See this MIN for an example from Sky Pilot last Sunday.

Snowpack Summary

Another 15-25 cm of snow is forecast to accumulate by midday on Sunday above 800 m. Above 1300 m, this will add to the previous 25-40 cm of snow that blanketed slopes on Friday. Below 1300 m, new accumulations will fall on top of a warm crust or wet snow surfaces. The recent snow has been accompanied by moderate to strong strong south winds, forming touchier slabs on leeward slopes. Pay attention to how wind has redistributed snow and investigate the bond of the new and old snow interfaces as you travel in the backcountry on Sunday. Massive cornices exist on ridgelines, which can act as triggers on slopes below. 

Freezing levels remained elevated throughout Friday's storm, saturating the snowpack below 1300 m. A cooling trend over the weekend is expected to settle and strengthen the snowpack below this widespread March 5th rain crust. 

Terrain and Travel

  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Cornice failure may trigger large avalanches.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

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.