Bollettino valanghe

West Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

Wed
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 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

You’re most likely to trigger an avalanche on steep slopes holding recently wind-drifted snow. Check how well the new snow is bonding before committing to steep terrain, and use lower-angle slopes to reduce uncertainty.

Problemi valanghivi

  • Wind Slabs

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

    Moderate overnight winds will drift the light snow at the surface. Add another 1–3” of light new snow, and fresh wind slabs are likely to form on leeward slopes. Most should be small, but they may be hard to spot if covered by a few inches of softer snow. 

    Use scoured slopes, cornices, and drifts to figure out where a wind slab might be hiding. Stomp on small cornices and wind-drifted features to test reactivity. Hand shears can also help assess the bond of fresh wind slabs. Choosing slightly lower-angle, more planar terrain is an easy way to reduce your chances of triggering one.

    (3/17/2023)

    Wind scoured snow can help you identify slopes that might hold wind slab.

Avalanche Discussion

Look for rollerballs and wet snow on steep slopes receiving direct sun. Temperatures will be chilly, but a bit of warming combined with recent new snow could still produce small wet loose avalanches.

Observers in West North reported gusty winds drifting snow and filling in skin tracks above 5,000 feet. No fresh wind slabs were noted at mid elevations. The most notable observation was another skier-triggered slab on a very steep, unsupported mid-slope feature on the east aspect of Table Mountain. Several human-triggered slab avalanches were reported in this area over the weekend.

Overall, Stevens and Snoqualmie Pass have seen less snow and less avalanche activity over the past few days. Both zones picked up about 6 inches of new snow during the Valentine’s Day storm and saw a handful of avalanches over the weekend.

  

 

Regioni coperte