Bollettino valanghe

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Northwest Avalanche Center
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Pericolo valanghe

Sat
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
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In sintesi

As significantly more rain impacts our snowpack, very large unpredictable wet avalanches could run naturally. You could also still trigger smaller wet avalanches on steep slopes. In this uncertain and low likelihood, high-consequence situation, default to lower-angle terrain and don't linger beneath large avalanche paths. 

Problemi valanghivi

  • Wet Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1.5–2.5

    Wet slabs are notoriously difficult to predict, but we suspect that if we're going to see wet slabs, the 1" of rain headed our way on Friday might be enough to get them moving. If you're braving the deluge for some time in the mountains, avoid lingering in gullies or runouts from large overhead avalanche paths. If you're sinking deeply into wet heavy snow, stick to lower angle slopes to avoid triggering wet avalanches. 

    Very large avalanches that begin in alpine areas may run through gullies into lower elevations.  Plan your route carefully and add more buffer between you and avalanche runouts connected to bigger slopes. Minimize your time under slopes with overhanging corncies.  At lower elevations, even small wet avalanches can be forceful enough to injure you or push you into other hazards, even if they're not big enough to bury you.

    (3/26/2025)

    This wet slab avalanche failed 2-3ft deep on a crust last season. With rain, similar avalanches could occur on Friday. 

    WS-N-D3-O

    Photo: WSDOT

Avalanche Discussion

Friday will bring the last, but aggressive, pulse of moisture from this seemingly never-ending atmospheric river event. In the next 24hrs you can expect over 1" of rain with moderate winds. Temperatures will be slowly cooling throughout the day, but the timing likely won't allow for much snow accumulation. You might see a dusting of white at upper elevations by late in the day. 

There is a chance that if you climb through the rain into the very upper elevations, small wind slabs may form in isolated terrain features. If you've made it up to dry snow, watch for cracking in wind-stiffened snow as a sign that you could trigger a small avalanche. 

On Tuesday, an observer in the Silver Star area found wet snow conditions and small wet loose avalanches running below cliffs.  Before the warmup, an NWAC forecaster in the Blue Lake area on Sunday reported minor cracking in wind-drifted snow and easy triggering of loose avalanches in sheltered terrain. The stormy week prior delivered 2-3 feet of snow over the March 8th crust. There was a favorable bond at this interface on Sunday, but will all the water headed this way, we won't rule out wet slabs running on this crust.

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