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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Regions
Northwest Inland.
There is quite a bit of uncertainty with forecast snowfall amounts and wind speed this weekend. This forecast is based on 10 to 15 cm of snow falling Friday night. If less than 5 cm of snow falls, then danger will be low at all elevations.
Confidence
Low - Timing, track, or intensity of incoming weather system is uncertain
Weather Forecast
The weather models are having a pretty tough time getting a handle on the current weather pattern and even the professional meteorologists are pulling out their hair. The freezing levels are thought to be fairly accurate, but the wind and precipitation values should be taken as a suggestion at best.FRIDAY NIGHT: Moderate to strong south/southeast wind, freezing level around 1000 m, 1 to 11 mm of precipitation expected which could translate to 5 to as much as 15 cm of snow in favored locations.SATURDAY: Broken cloud cover, freezing level rising to 1500 m, light to moderate south/southeast wind, trace of snow. SUNDAY: Broken cloud cover, freezing level around 1500 m, moderate to strong southwest wind, trace of snow possible.MONDAY: Broken cloud cover, freezing level around 1300 m, moderate to strong southwest wind, trace of snow possible.
Avalanche Summary
There have been no recent avalanche observations in the region. If you're out this weekend we'd love it if you would submit what you're seeing to the Mountain Information Network.
Snowpack Summary
Storm snow falling through the weekend is unlikely to bond well to the mix of old surfaces that include both crust and surface hoar. This will likely only be a problem at and above treeline. Below treeline the snowpack is isothermal throughout much of the forecast region.Previously, sun exposed slopes in the alpine and all aspects at treeline and below were becoming moist to wet during the heat of the day. Dry snow may still be found on north-facing slopes in the alpine. At these locations, 30-50 cm of well settled snow overlies a layer of facets (sugary snow) that was buried around March 10th.
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.