Bollettino valanghe

Blues

Wallowa Avalanche Center
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Pericolo valanghe

Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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In sintesi

Warming temperatures in the Blues today will increase the chances of triggering an avalanche, especially on solar aspects.  As the cold snow from Sunday's storm warms up, it will form into a slab, which rests above weak snow from last week's cold snap.  If you observe roller balls, and pinwheels and have to de-layer it's time to look for shadier aspects to recreate.  

This forecast is sponsored by Terminal Gravity Brewing in Enterprise, OR.  

Problemi valanghivi

  • Persistent Slabs

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

    On Sunday two WAC forecasters remotely triggered a large avalanche in the Blues near Lookout Mountain.  You can read more here.   The culprit was weak surface hoar that was buried beneath a foot of snow that fell on Sunday.  As they traveled along a road, the steep slope below them avalanched.  They had identified a buried weak layer earlier in the day while digging a snow pit and also observed shooting cracks from their snowmobiles on small test slopes.  

    You may feel the snowpack collapsing and observe shooting cracks as "red flag" indicators of instability.  Unfortunately, this is not always the case, and you must dig down a foot or two to look for strong snow over weak snow.  It would be really tempting to drop into a steep terrain feature in search of cold powder snow this weekend, especially as solar aspects warm up and the snow quality decreases.  Doing so could be dangerous, especially if the runout involves rocks, trees, or terrain traps.  

  • Loose Wet

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

    Warm temperatures, significant solar radiation and rising snow levels will turn on the wet loose factory today.  Wet loose avalanches often start out in steep terrain near rocks and trees and fan out as they collect more snow while traveling downhill.  They are good indicators of the surface snow warming and becoming more slab-like.  Avoid steep slopes with wet loose activity, as we know there is weak snow beneath the foot of fresh that fell last Sunday.  

    As daytime temperatures increase look for higher elevation shaded N-E aspects to recreate, or avoid traveling on or under sun-affected slopes >30 degrees.  Consider your route selection later in the day or as you are exiting the field, as you don't want to get caught traveling on or below steep terrain that has been getting a lot of sun.  

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