Bollettino valanghe

East Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

An approaching front will bring a transitional day with high clouds. Increasingly strong winds may create shallow, but reactive wind slabs in the alpine. Steer around very steep slopes near ridgelines if you observe active wind transport. 

Problemi valanghivi

  • Wind Slabs

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

    Increasingly strong NW winds may drift low-density snow into shallow wind slabs at higher elevations. These should be on your radar if you travel into the alpine. Any slabs should remain small, but with weaker snow they could be reactive to human triggering. Look for active wind transport and wind textured surfaces to clue you in. Steer around very steep slopes that appear to be loading.

    Example wind drifting snow.

    Photo: Will Govus

Avalanche Discussion

Monday should be a transitional day with increasing high clouds and ridgetop winds ahead of a cold front that should arrive on Tuesday. Quieter weather has allowed the snowpack to settle out. Dry snow on shaded aspects has become faceted and weaker, while sun crusts and melt freeze crusts have gotten thicker everywhere else. NWAC Forecaster Katie Warren rode up in the French Cabin and Thorp Creek areas on Sunday, and observed some small loose wet slides. Observers at Holden noted a number of small, wet loose avalanches off very steep terrain above 6,500ft on Saturday. They also noted some very thin wind slabs above 7,000ft, and some deep, dry snow in the shade up high. They did get some variable test results on weaker snow beneath a thin crust from Valentines Day about 3ft down on a NE aspect at 5,600ft. A widespread avalanche cycle occurred throughout much of the Cascades on the 28th. You'll find evidence of recent large and very large avalanches, often involving wet snow in many areas. The storm dropped copious amount of snow, and the rain line climbed up to around 6,500ft.

For many areas, expect variable travel conditions with breakable crust and icy surfaces at lower elevations. You could find nice spring-like corn riding on southerly aspects at mid and lower elevations if you time it right, but high clouds may also limit the amount of softening on Monday. There are plenty of large, old piles to navigate. 

Avalanches are unlikely in areas such as Mission Ridge and Blewett Pass with a very shallow snowpack. Here, it rained to ridgetop, and a cooling trend has since locked things up. With any luck, this next system may prove a decent little shot of snow for that area. For more information on how our current snowpack compares to seasonal averages, check out the monthly Climatological Snow Depth Report. 

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