Lawinenlagebericht

Mt Hood

Feb 11 – 12, 2019Northwest Avalanche Center
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Archiviert · abgelaufen 8 years ago

Lawinengefahr

Wed
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
4 · Gross
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Kernpunkte

Continued heavy snow, wind and warming will tip the balance and lead to surprising and life-threatening avalanches. With very dangerous avalanche conditions, traveling in avalanche terrain is not recommended. Put extra space between where you travel and any terrain where avalanches could start or run to overhead slopes.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–2

    Ridgetop winds have averaged 20-40 mph and gusting to 70 mph. 2-3 feet of storm snow combined with these strong winds are building deep slab layers. Any wind-affected snow is likely to be very sensitive to natural and human triggering. Most wind slabs will be forming over faceted (weak) snow above a firm crust (sliding bed surface), which is a prime recipe for very dangerous slab avalanches. Avoid avalanche terrain and stick to low angle terrain well away from open slopes above.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1

    Continued heavy snowfall at gradually warmer temperatures will form unstable slabs that will produce large natural and human-triggered avalanches. A very weak underlying snow structure exists in most areas, consisting of weak snow that may be poorly bonded to a hard crust, especially on any southerly facing terrain. Winds will keep the storm slab problem confined to sheltered terrain. These avalanches may be life-threatening and run long distances. It will be best to avoid avalanche terrain on Tuesday.

Discussion

Snow and Avalanche Discussion

2-3 feet of storm snow has already fallen as of Monday afternoon. An additional 1-2 feet of denser heavily wind affected snow overnight and Tuesday will tip the balance and create very dangerous avalanche conditions.  Safe travel may be found only in non-avalanche terrain and lower-angle slopes well away from where avalanches start, run or stop.

Professions triggered 1-2’ wind slabs with slope cuts on west through southwest slopes in the White River Canyon at 5500 to 6500 ft on Sunday afternoon.

White-out conditions Monday prohibited views of avalanche control results in higher terrain. 

Snowpack Discussion

New Regional Synopsis Coming Soon

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