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Avalanche Forecast

Archived

Mar 1st, 2022–Mar 2nd, 2022

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.
Below Treeline
Natural avalanches unlikely.

Regions

North Rockies.

With no significant change in the weather for several days the primary hazard is wind slab avalanches at upper elevations.

Confidence

High - Confidence is due to a stable weather pattern; little change is expected for several days.

Weather Forecast

TUESDAY NIGHT: Cloudy with isolated flurries and trace amounts of snow, light to moderate wind from the south, treeline temperatures drop to -8 C.

WEDNESDAY: Mostly cloudy skies with some convective flurries bringing localized accumulations of 5 cm, light wind from the south with moderate gusts during flurries, treeline temperatures around -6 C.

THURSDAY: Mix of sun and cloud, light wind from the west, treeline temperatures around -8 C.

FRIDAY: Mix of sun and cloud, light wind from the north, treeline temperatures around -10 C.

Avalanche Summary

Several small (size 1) natural and human triggered avalanches were reported during the stormy weather over the weekend and into Monday. These included both slab and loose avalanches in the top 15-30 cm of new snow, primarily on north and east facing slopes.

Snowpack Summary

Recent flurries delivered 15 to 30 cm of snow, which has been wind affected in open terrain and is quickly settling due to mild temperatures. This snow covers a wide variety of hard layers, including wind-affected snow on alpine slopes and a sun crust on steep south-facing slopes. A widespread crust layer from mid-February is 50 to 100 cm deep in the western side of the range and 25 to 50 cm deep on the eastern side. The snowpack is generally well settled below this crust.

Terrain and Travel

  • Be carefull around freshly wind loaded features.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Use caution when approaching steep and rocky terrian.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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.