Lawinenlagebericht

Presidential Range

Mount Washington Avalanche Center
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Lawinengefahr

Sun
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 5 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Dangerous avalanche conditions exist and large human-triggered avalanches are likely, particularly on slopes where the wind overnight has been drifting snow. Natural avalanches are possible on steep east and southeast facing terrain. Blowing snow at the ridgelines is a red flag for snow loading onto the slopes below and increasing avalanche hazard.

Lawinenprobleme

  • Wind Slabs

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

    Today you can find fresh wind slabs on many aspects around the compass, but the largest will be found in east facing ravines including Tuckerman Ravine, Huntington Ravine and the Gulf of Slides. 

    The 8 inches of new snow yesterday was affected by northwest wind overnight creating 2 to 3 foot thick wind slabs in lee terrain. Natural avalanches may be possible where drifting snow accumulates the most.  Wind loading of any remaining new snow is likely to continue today with wind shifting west at 30 mph and increasing. Freshly formed slabs of wind drifted snow at these wind speeds will be on the softer side (1F) and reactive to a human trigger.

    Look for blowing snow at the ridgelines and signs of instability underfoot as red flags for this avalanche problem, though obvious signs of active wind loading are much more significant.

Avalanche Discussion

Both the Mt. Washington summit and Hermit Lake received just under 8 inches of new snow yesterday, with the Gray Knob Snow Plot to the north reporting 6 inches.  West wind today will continue loading available loose snow from the west to the east. While the east facing slopes are loading, wind slabs formed yesterday on westerly aspects will slowly decrease in sensitivity from the impact of the wind.  

The avalanche problem today is limited to new snow only. After two warm, rainy spells and a return to cold temperatures a thick crust will almost certainly exclude older snow from directly contributing to avalanche size. 

Keep in mind that danger ratings, and the terrain rose image used in this forecast are tools to indicate the areas with the greatest chance of finding the avalanche problem. Today especially, wind slabs of all sizes may be found on many aspects due to changes in wind direction over the last 24 hours. 

 

Thanks to everyone for taking the time to submit observations of snow and avalanche conditions, both inside and outside our avalanche forecast area. Please keep them coming.

The Lion Head Summer Trail is now closed for the season due to avalanche risk. The Lion Head Winter Route is open.

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