Bollettino valanghe

Elkhorns

Wallowa Avalanche Center
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Pericolo valanghe

Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 8 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Triggering a wind slab 1-3 feet deep remains possible along upper-elevation exposed ridgelines.  Avoid stiff, dune-like formations and corniced ridgelines.   Below the upper ridgelines, if you are riding terrain steeper than 30 degrees, you may encounter small loose snow avalanches- dry loose on the shady aspects, potentially wet loose rollerballs throughout rocky cliffbands on solar aspects.   

 This forecast is sponsored by Brooks Painting. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Winds have decreased, but isolated pockets of stubborn windslabs will likely still linger at mid and upper elevations.   Avoid areas that have stiff-looking or hollow-sounding snow surfaces.   If you see shooting cracks in stiff snow, like the one in this picture, you have likely found a windslab.  Use small test slopes to test the sensitivity of representative slopes.  When in doubt, select less consequential terrain.  

    Wind slabs are most likely on steep leeward slopes below cornices, ridgelines and saddles. Avalanches are also unlikely but not impossible in steep, sheltered terrain where new snow may have poorly bonded to the 1/3 crust. 

    Cracking of wind-loaded snow.  Shooting cracks from your ski tips are a great indication that sensitive windslabs may exist.  Select less consequential terrain if you see these red flags. 

Avalanche Discussion

Wind Slabs:

The wind slab problem should be straightforward to recognize and avoid along upper elevation ridgelines.  We have seen 6 large natural wind slab avalanches in the Northern and Southern Wallowas since last Tuesday.   We are now about 48 hours after the initial wind loading event, so any lingering windslabs will likely be less sensitive today.  There is still plenty of snow to be blown around, so monitor any new wind loading patterns and avoid terrain steeper than 30 degrees if you see active wind loading on those slopes.  

Loose Snow Avalanches:

Surface snow may be loose, and on shady aspects in terrain steeper than 35 degrees, you may encounter dry loose avalanches (or sluffs) that could entrain up to a foot of unconsolidated surface snow.  As the sun warms solar aspects- coupled with warming temperatures through mid-week, small and manageable wet loose avalanches may develop.  While likely not big enough to bury you, loose snow avalanches could carry you over consequential terrain (cliffs and rock bands) or into a terrain trap (gully, creek, or dense trees).  

What's going on deeper in the snowpack?

While the avalanche danger may be moderate, uncertainty is high and warrants its own conversation. Forecasters have been monitoring several buried crusts in the snowpack (12/18, 12/26, and 1/3), and small facets have been observed around these crusts.     Before committing to avalanche terrain, it's recommended to dig down in the snowpack to observe any weak snow around these crusts.  When higher degrees of uncertainty exist, always defer to less consequential terrain less than 30 degrees in steepness. 

What are you seeing in the snowpack? Please send us an observation!  Notable information includes the depth of any crusts and the hardness of the snow above and below these crusts, as well as the amounts of snow you encounter at various elevations. This observation is a perfect example of uncertainty at work in the current snowpack. 

Snowmobile Riding Clinic for Snow Professionals Feb 26-27

If you are a snow professional who’s interested in building your snowmobile skills and technique, or are looking to advance to the next level, the Wallowa Avalanche Center is offering a 2-day clinic on February 26-27.  This clinic is open to Avalanche Forecasters, ski patrollers, ski guides, and other industry professionals.  Click here to learn more.  

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