Lawinenlagebericht

Presidential Range

Mount Washington Avalanche Center
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Lawinengefahr

Fri
Hochgebirge
1 · Gering
Waldgrenze
2 · Mässig
Unterhalb
Keine Stufe
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Veraltet — dieser Lagebericht ist 2 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

There is the potential to trigger large avalanches in east and south-facing terrain today at middle elevations. As temperatures rise and sunshine melts  snow, the hazard will be increasing. Consider convex terrain features carefully as this may be where you are most likely to trigger an avalanche.

Lawinenprobleme

  • Wet Slabs

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

    Wet slabs could decrease in stability throughout the day, presenting an unlikely but high consequence event to human triggers. As these slabs continue to warm, meltwater may weaken bonds and increase instabilities within the snow. Due to the firm slabs, you may not see roller balls or much surface snow wetting that typically indicate wet snow instabilities.

    Look out for rapid warming today which would work to destabilize snow more quickly. Careful terrain consideration will be important as you are most likely to find this problem in steep rollovers or wind sheltered features where snow may be softer. You can reduce your exposure today by limiting travel on those features in steep terrain.

Avalanche Discussion

The moderate hazard rating for today is because of the large size of these remaining slabs in terrain. There is difficulty in predicting wet snow avalanches which is compounded by the destructive capability these avalanches have. For travel today, consideration of terrain features will be your best practice as there will be little to no warning signs of instabilities. This make up feels reminiscent of the 2/5 skier triggered Oakes Gulf avalanche early this season. This was triggered in a steep rollover and is the type of protected feature that you could find today’s problem in.

We removed upper elevations from this problem as temperatures are forecast below freezing today and they did not get above freezing yesterday. Verbal observations from skiers yesterday in Tuckerman Ravine confirmed icy, scoured, and firm conditions at the top of Left Gully and other gullies in terrain which will make finding an avalanche problem there unlikely.  

The other question forecasters grappled with today was how wet does a wind slab need to be to be called a wet slab? These slabs are firm and this may limit the snowmelt that could wet the snowpack. There is a possibility that these slabs remain dry and stay more like a wind slab, but if solar gain does affect the snowpack, this could increase instabilities today and summarizes why we settled on a wet slab today.

OBSERVATIONS: Please consider submitting an observation of what you are seeing in your travels. Submitting an observation hones your skills, informs other users, and improves our forecasts.

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