Bollettino valanghe

Mt Hood

Feb 8 – 9, 2019Northwest Avalanche Center
Vedi sulla mappa
Archiviato · scaduto 8 years ago

Pericolo valanghe

Sun
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Apri la mappa completa

In sintesi

New snow and wind will create dangerous avalanche conditions Saturday. You can trigger an avalanche on any steep wind loaded slope. Increasing easterly winds will load unusual aspects and build wind slabs on open slopes below treeline as well as higher terrain during the day. Storm slabs may form in wind sheltered areas below treeline. 

Problemi valanghivi

  • Wind Slabs

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

    Shifting winds will become stronger and more easterly during the day. This should easily transport recent and new low density snow onto a variety of aspects. Wind slabs will likely develop in all elevation bands as winds increase. Approach steep unsupported slopes with wind-drifted snow cautiously, feeling for firm or hollow sounding snow as a sign that wind slabs may be present. You can stay safe by traveling on ridges, wind-scoured areas and any slope less than 35 degrees.

  • Storm Slabs

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

    If storm slabs develop Friday night and Saturday, they may be touchy and break more widely than usual where they build over older, weaker snow. Avoid very steep open slopes and convexities and choose simpler terrain if conditions are touchy. Use small test slopes to gauge the storm slab problem.

    Loose dry avalanches will continue to be a concern in very steep terrain that isn't wind affected. Keep this in mind around terrain traps; you don't want a small but fast moving avalanche to take you on an unexpecting ride into trees or over a cliff.   

Discussion

Snow and Avalanche Discussion

After a long stretch of quiet avalanche conditions, the avalanche hazard is expected to deteriorate Friday night and Saturday as new snow and wind affect the Mt. Hood area. Widespread surface hoar was reported below treeline in the Mt. Hood Meadows area Friday.  Storm or wind slabs building on top of weaker snow, whether it's buried surface hoar or near surface facets will be more likely to produce avalanches Saturday.  For areas where the new snow stays unconsolidated, loose dry avalanches will become a problem in steep non-wind affected terrain.  

Snowpack Discussion

Regional Synopsis coming soon. 

Regioni coperte