Bollettino valanghe

Stevens Pass

Northwest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Strong winds created slabs in exposed mid and upper elevation terrain, and avalanches are possible.  Use caution in steep or rocky terrain, where even a small slide could cause injury. Icy surfaces beneath the new snow make for both a great sliding surface for avalanches, and challenging conditions for backcountry travellers. 

Problemi valanghivi

  • Wind Slabs

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

    A backcountry user in the Lichtenberg area on Tuesday found small wind slabs near and above treeline primarily on west slopes.  They were small, only about 3 inches deep but propagating several feet out in front of them. They ran on the slippery crust beneath.  Around an inch of snow is forecasted overnight, and strong winds will continue to build slabs for us from now through Wednesday. Expect to find more small slabs lee to the south and east, but you might find them on other aspects as well. Loading from this wind direction is not common, so you may find deposits in unusual locations and further downslope than you might normally look. Search for them around features such as in gullies or near outcroppings, and along ridges and subridges. Snow may appear smooth and pillowlike, or textured. Expect the snow to feel stiffer, or hollow. Avoid slopes steeper than 35 degrees where you notice any of these snow characteristics.

    You will see wind slabs like this on Wednesday.

Avalanche Discussion

The 6 inches of snow we’ve received in the last few days is a welcome addition to our mostly firm preexisting snowpack. You will still notice the old snow layer, especially at lower elevations where a solid or punchy crust was previously at the surface. You may find icy surfaces at upper elevations where wind stripped the snow away, especially on south aspects.  Be wary, as these icy surfaces are potentially dangerous for travel, and they also make a good bed surface for avalanches to slide on. 

On the northern half of the compass you might find a weak layer of snow just under the snowfall that began on Sunday.  These aspects are probably where snow will be loading, and if these weak layers are present slabs may fail easily on the weak layer.  

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

Regioni coperte