Lawinenlagebericht

Central Cascades

Central Oregon Avalanche Center
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Lawinengefahr

Thu
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

On Wednesday, it will be possible to trigger an avalanche on slopes with wind deposited snow from Monday night.  Be skeptical of any slopes near treeline and in the alpine that haven't been scoured down to the crust.  In many places recently wind hardened snow seems pretty well "adhered" to the old snow surfaces but don't count on that being the case.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2.5

    Wind speeds on Monday night and into Tuesday morning were Extreme, and we saw Intense blowing snow.  While the wind came primarily from the Southwest and West, actual patterns of blowing snow were somewhat unusual.  On Tuesday I found both wind hardened snow, and scoured slopes, even below treeline.  Assessing the extent and patterns of wind loading will be essential if you are riding near treeline, in the alpine, or even on large open slopes lower in the terrain.  I found pole probing (with an upside down ski pole) to be effective for observing how deep the new snow was, as well as how thick the hardened layer of wind slab was.  Wind Slab avalanches could be large on slopes with a large fetch, and potentially Very Large on isolated slopes at alpine elevations.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely
    Größe
    1–1.5

    Sunny skies and temperatures well above freezing would typically indicate a Wet avalanche problem.  However, due to the generally hard nature of our snowpack (wind hardened on lee slopes and completely scoured on windward slopes), I think that any Wet Loose avalanche activity will be minimal except on the steepest South slopes and directly below cliffs or rocks.  If you are observing rollerballs and pinwheels on these steep, South slopes, it will be worth considering Wet Loose avalanches.

Avalanche Discussion

We are having some serious swings in the weather.  Torrential rain on Saturday night and Sunday resulted in some large avalanches (see picture), particularly where Cornice collapses triggered Wet Slabs beneath.  As the temperature cooled off on Monday afternoon and snow began to fall, we had Extreme winds which affected most slopes to some degree.  Now on Wednesday, we'll see sunny skies and temperatures rising well above freezing.

It is notable that we have limited observations from high alpine elevations, and so I have Moderate confidence in my forecast for that terrain.

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