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Avalanche Forecast

Archived

Apr 12th, 2019–Apr 13th, 2019

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

Watch for fresh slab formation, especially in high elevation north facing features as a storm rolls into the region. If storm totals exceed 20 cm, the danger ratings should all be bumped up one level.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain on Saturday

Weather Forecast

The weather pattern looks more typically winter than we've seen in some time. Right now the weather models are in agreement that the region should receive 1 to 5 cm of convective snowfall Saturday with another 1 to 5 cm Saturday night. There is a bit of a lull Sunday and Monday before another shot of precipitation looks to make landfall on Tuesday.FRIDAY NIGHT: Freezing level around 1000 m, light west/northwest wind, trace of snow possible. SATURDAY: Overcast, freezing level around 1200 m, light to moderate south/southwest wind, 1 to 5 cm of snow.SUNDAY: Broken cloud cover, freezing level around 1300 m, light west wind, trace of snow possible. MONDAY: Scattered cloud cover, freezing level rising to around 1400 m, light variable wind, trace of snow possible.

Avalanche Summary

On Thursday small loose wet avalanches were reported from steep terrain. If you're out we'd love it if you would submit what you're seeing to the Mountain Information Network.

Snowpack Summary

Up to 20 cm of storm snow from last weekend now rests on a weak layer buried April 4th which consists of a 4 cm crust, surface hoar and facets. The recent snow has transitioned into a hard surface on most aspects and elevations with the exception of high alpine North aspects. Light to moderate wind generally out of the south over the last week may have formed wind slabs that may be sensitive to human triggering especially where it sits above the April 4th interface.Below treeline the snowpack is isothermal throughout much of the forecast region.

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.