Bollettino valanghe

Silver Valley & Bitterroot Mountains

Idaho Panhandle Avalanche Center
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Pericolo valanghe

Wed
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Northeast and east wind today may build pockets of wind slab on the western half of the compass rose. While possible to human trigger, the small amounts of snow available for wind transport should limit size of new slabs. You can avoid this developing avalanche problem by sticking to wind sheltered terrain at slightly lower elevations or by identifying and avoiding wind loaded terrain 35 degrees or steeper. With these exceptions, most of our terrain has a few inches of snow over last week’s prominent crust and lacks an avalanche problem. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    An inch or slightly more of new snow today combines with a few inches of snow already on the ground to provide snow available for wind transport today. This limited snow available for today’s moderate northeast and east wind should keep size of new wind slabs small. Remember that while unlikely to bury you except in pronounced terrain traps, small avalanches can easily take you for a ride towards rocks, cliffs, trees, or other obstacles that might be down slope. Similarly, small wind slabs formed this weekend under westerly winds, and while reverse wind direction should scour this terrain today, a few now stubborn wind slabs might remain. You can identify wind slabs today by watching for signs of active wind loading. Know that any new snow thicker than approximately 6” above the prominent crust is probably wind slab.

    (3/7/2022)

    Wind affected snow, 3/7/22, Gold Hill ridgeline. Look closely at the bowl in the background and you'll find a small crown and avalanche debris from avalanches last week.

    Photo: Ryan Matz

Avalanche Discussion

Small amounts of new snow since late last week, accumulating to 6” or so, sits on top of a thick, refrozen rain crust that we’re finding on all aspects and elevations in the St. Regis & Silver Valley zone. The robust and supportable nature of this crust focuses our stability concerns on the snow above it for the near future. Though not a problem at this time, some near surface facets were found in the snow above the crust this weekend. This reminds us that with cold temperatures but no significant snow in the forecast this week, our surface snow might become a future weak layer. Currently, though, it provides some decent riding conditions at upper elevations in areas not affected by sun or wind. Watch for those avoidable wind slabs and enjoy the mostly stable conditions!

Regioni coperte