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

Dec 19th, 2018–Dec 20th, 2018

Alpine
Natural avalanches unlikely, human triggered possible.
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.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

Information from this area is limited, especially regarding recent avalanche activity. It is critical to supplement this forecast with your own observations. Back off if you see recent avalanches, experience whumphing, or see cracking in the snow.

Confidence

Low - Due to the number of field observations.

Weather Forecast

WEDNESDAY NIGHT: Cloudy with flurries, up to 5 cm, moderate southwest winds, alpine low temperature near -10°c. THURSDAY: cloudy with scattered flurries, up to 5 cm, northwest winds, 20-40 km/h, gusting to 60 km/h, alpine high temperature near -7°c. FRIDAY: Cloudy with sunny periods and isolated flurries, southwest winds, 25-40 km/h, gusting to 60 km/h, alpine high temperature near -8°c, low temperature near -11°c. SATURDAY: Cloudy with sunny periods and isolated flurries, southeast winds, 20-40 km/h, alpine high temperature near -9°c, low temperature near -11°c.

Avalanche Summary

On Sunday, recent slab avalanches, whumpfing, and cracking were observed in the Hankin area. See this MIN report. Natural slab avalanches were also reported last week during the start of the stormy weather, including two size 2 avalanches on east-facing wind-loaded slopes near treeline (1700m) and several smaller slabs in steep gullies at low elevations. See this MIN report from Ashman. Recent avalanches have likely failed in the storm snow and possibly on a weak layer from the early December dry spell found roughly 40-70 cm below the surface.

Snowpack Summary

A total of 40-70 cm of snow has fallen over the past week, likely forming storm slabs and wind slabs throughout the region. The combination of new snow and strong wind from the southwest is likely forming thicker and more sensitive wind deposits at higher elevations. The storm snow may still need a bit more time to form a good bond with the weak surface hoar (feathery crystals) and facets (sugary snow) that formed during the dry spell in early December. Information is very limited about the current strength of this potential weak layer. Deeper in the snowpack, there are several crusts including an early season crust with facets near the bottom of the snowpack.

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.