Bollettino valanghe

West Slopes Central

Northwest Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Fri
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Open full map
Non aggiornato — questo bollettino è scaduto 2 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

Problemi valanghivi

  • Wind Slabs

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

    Very strong winds and moderate snowfall built unstable slabs on Wednesday in neighboring zones. Continued loading overnight will carry this hazard into Thursday morning as well. Be aware that a small wind slab avalanche could pull out a larger one that releases in deeper layers. When in doubt, just avoid slopes holding recently wind drifted snow to reduce the likelihood of triggering an avalanche.

    Many windward slopes are scoured down to crust while loaded ones hold thick, dense slabs. As usual, danger from wind slab avalanches is greatest in more wind exposed terrain, but strong winds have created slabs at lower elevations as well. If the wind is still blowing, drifting snow will show you which slopes are loading up. Track changes in snow texture, stiffness, and depth to hunt down fresh slabs if you find calmer conditions. Simple tests like hand shears and small slope cuts can show the bond of wind slabs to the layers below.

     

    (2/19/2025)

    A widely propagating slab on a heavily wind loaded slope in the Baker BC/West North. Triggered with a bit of stomping from the lower-angled terrain above.  Southwest aspect at 4700'.

    (HS-ASc-D1-I)

Avalanche Discussion

Thursday should bring slightly cooler temperatures but you might see a few sunbreaks in the afternoon. Keep track of slopes picking up some sun, and look for signs of instability like rollerballs or small wet avalanches. You are most likely to see these below cliffs or steep tree covered terrain.

Wednesday brought stormier conditions and more avalanche danger than expected to some parts of the Cascades. The west slopes of the Cascades picked up anywhere from 2-10” of new snow throughout the day. Observers in West North reported very strong winds, lots of wind transported snow, and reactive wind slabs on a variety of aspects. The slabs were failing at a thin layer of soft snow above a crust that formed a few days ago on all aspects. Less wind and snow were reported from Stevens Pass on Wednesday at mid-elevations with no new avalanches observed as of late afternoon. 

 

 

 

Regioni coperte