Avalanche Forecast
Issued: Feb 9th, 2015 9:22AM
The alpine rating is Storm Slabs and Deep Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Poor - Due to the number of field observations
Weather Forecast
Remnant moisture from the pineapple express will bring light precipitation to the region on Tuesday morning. By the end of the day, a warm dry ridge of high pressure will develop bringing progressively warmer temperatures and clearing throughout the forecast period. Tuesday: Light snowfall and overcast skies / Moderate northwest winds / Freezing levels at or near valley bottom Wednesday: Mix of sun and cloud / Moderate southwest winds / Freezing level climbing throughout the day to 2000m Thursday: Mix of sun and cloud / Moderate southwest winds / Freezing level climbing to 2700m
Avalanche Summary
Observations have been essentially non-existent in recent days. This likely speaks more to a lack of observers rather than actual conditions. I'm confident recent storm loading has produced large storm slab avalanches at higher elevations, while loose wet or wet slab avalanche activity occurred at lower elevations where rain fell.
Snowpack Summary
Since Febraury 5th, moderate to heavy precipitation fell throughout the region. The rain line during the storms generally hovered around 1700m, although there were periods where rain fell into the alpine. In the alpine, heavy accumulations of moist, dense snow have been pushed by strong southwest winds into much deeper deposits in upper elevation lee terrain. The recent storm snow overlies a hard crust layer (which may have overlying surface hoar) which was formed in late January. At lower elevations, continuous rain has saturated the snowpack. I'm sure cornices are large and fragile.In the mid to lower snowpack, you may find the mid-December crust/facet/surface hoar combo. At lower elevations rain has likely destroyed what was left of this layer. At higher elevations recent storm loading may have produced very large avalanches at this interface, although observations have been extremely limited.
Problems
Storm Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 10th, 2015 2:00PM