Bollettino valanghe

Bollettino valanghe

Payette Avalanche Center
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Pericolo valanghe

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

In sintesi

Rain on snow up to 7,700 feet today will increase the chance of triggering wet loose avalanches on all aspects below 8,000 feet which could step down up to 3 feet deep to buried weak layers. Wind slabs up to a foot thick in Northern terrain may still be sensitive to the weight of a person under the additional stress of rain and warmth. 

Use extra cautious travel protocols around cornices, ridgelines, and all steep slopes, especially shaded rocky terrain where the snow is the weakest.

Today's forecast is sponsored by Rocky Talkie 

Problemi valanghivi

  • Loose Wet

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

    Rain on snow all the way up to 7,700 feet along with sustained warm temps through the night are going to increase the chances of small natural wet loose avalanches on steep slopes below 8,000 feet. 

    Human-triggered avalanches are possible on slopes steeper than 30 degrees. The warmer snow that has fallen above the rain line will be upside down and likely run in steep terrrain. Be cautious in run-out zones and where there are overhead hazards as small natural wet loose avalanches are possible in very steep and rocky terrain. 

    (1/27/2024) Public observation from Lick Creek East of McCall of rollerballs on the surface.

  • Wind Slabs

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

    Friday, W/SW winds were blowing and drifting snow all day and formed slabs up to a foot thick on North and East aspects. Time has not helped heal these slabs much as they formed over persistent weak layers, and given the added stress of rain and warm temps, you are still going to want to be cautious near ridgelines and cornices today where the sensitivity is greater. 

     Local terrain features can alter prevailing wind patterns. Wind loading can be expected across multiple aspects as you gain elevation. Look for clues like shooting cracks from your skis, sled, or board. Pay attention to the snowpack collapsing and sounds like whumpfing.

    (1/27/2024) Not well-bonded hard wind slab on the North aspect of Sgts 7700', peeled off easy and clean with a ski kick.

  • Persistent Slabs

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

    Persistent weak layers formed during a dry spell in late December were buried on New Year's Day, and are now 2-3 feet deep.

    Although it's becoming less likely, triggering a persistent slab avalanche 2-3 feet deep is not completely impossible today as temps and rain and human triggers can get the upper snowpack moving and cause a step down to deeper weak layers and create a large avalanche, especially in steep, wind-loaded terrain above 7000'.

    This link to our observation page shows the breakdown of instability and recent avalanche activity during the past week. We've observed several large, natural avalanches within the past 7-10 days. Instability peaked earlier this week. As the name implies, persistent slab problems tend to persist for a while even after instability has peaked. All of these persistent slab avalanches failed above 7000' on N, NE, and E facing slopes.

    (1/26/2024)

    Looking across the crown line, estimated 400' across

    Photo: Kevin Studley

Avalanche Discussion

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