Bollettino valanghe

Bollettino valanghe

Payette Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Triggering Weak layers of facets and buried surface hoar in the upper 2 feet of the snowpack is becoming less likely, but still possible! When these weak layers fail they have been surprising people and have shown energy and potential to propagate fractures which have produced daily reports of human-triggered avalanches.  

Remain cautious on slopes steeper than 30 degrees: Use good travel protocols like checking layers in the snowpack and watching your partners from a safe spot while they are on slopes steep enough to slide, and make sure you are equipped with an avalanche transceiver, a shovel, and a probe on your person. 

 

Problemi valanghivi

  • Persistent Slabs

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

    The upper 2 feet of our snowpack have been responsible for producing human-triggered avalanches this past week almost every day. The chances of triggering these layers is winding down but may linger a bit longer than we want. Our test pits have been showing hard results with propagation (ECTP28 on MLK above Twin Lakes) mainly on Northern aspects, and the better that the locations were protected from winds the more preserved this layer is and is producing some easier failures, West mountain has preserved these weak layers even better than other locations that we have sampled. 

    The name persistent weak layer says it all and should drive just how conservative you are in your travel protocols and decision-making.  

    (1/16/2023)

    Photo of a machine-triggered avalanche in the Poison drainage. Taken by a skier from just South of the Tamarack ski area. It was believed to be within the last couple of days.

    Photo: Todd Leeds

Avalanche Discussion

Today's forecast is sponsored by Franklin Building Supply in McCall. Thank You for supporting the Payette Avalanche Center!

We have had reports on our observations page and social media almost every day this past week of human-triggered avalanches on skis and with snow bikes and snowmobiles. All of the reports that we have heard have had favorable outcomes, and to our knowledge, no one has been hurt. Most of the avalanches have been relatively harmless to people, or D-1. There have been a couple of D-2 avalanches that were large enough to injure, bury, or kill a person. These avalanches have all been in the upper 2 feet, failing on weak layers of facets that formed on the surface as well as surface hoar that has been buried.  Our test pits are showing signs of slowly strengthening, but there could be areas that are holding more sensitive layers that are well preserved.

Winds have calmed down over the last 48 hours and the chance of triggering a wind slab has also winded down. Use caution in and around cornices and wind-loaded terrain. Some cornices have grown from the South winds and are hanging quite far to the North and could break off easily.

***Be extra cautious on slopes steeper than 30 degrees: Use good travel protocols like checking layers in the snowpack and watching your partners from a safe spot while they are on slopes steep enough to slide, and make sure you are equipped with an avalanche transceiver, a shovel, and a probe on your back.