Bollettino valanghe

Presidential Range

Mount Washington Avalanche Center
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Pericolo valanghe

Sat
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

New snow and wind today will build wind slabs that could be reactive to a human trigger. Natural avalanches may become possible as winds increase. These slabs are likely to be limited in size and location. Look for these slabs near the tops of lee gullies and ridges. Additionally, loose dry snow may form slabs beneath steep terrain features and could grow large enough to carry and possibly bury a person. Evaluate snow and wind loading carefully today on these specific terrain features. The danger rating is MODERATE today with large avalanches possible in specific terrain features. We may exceed this danger rating if we reach the upper end of forecast snowfall or wind speed during daylight hours.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    A thin rain crust developed at all elevations Wednesday afternoon and evening, though this is confirmed only in the southern portion of the range and Crawford Notch. This crust will provide a poor bonding surface for new snow falling today. New snow sluffing from steep buttresses  today could build these wind slabs more quickly than wind alone. The size of any new wind slabs is directly related to the new snow falling today. Older wind slabs appear to be settled and  unreactive though exceptions may exist in pockets and in extreme terrain. 

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–2

    Recent cold temperatures and crusts may be driving a faceting problem in areas of thinner snowpack. This problem is likely limited to lower and perhaps some middle elevation areas.  Look and listen for collapsing and whumpfing. This problem seems to be occurring at the ground but may be occurring at other crusts higher in the snowpack. Recent snowfall may have stressed the weak layers.

    (2/4/2021) This observation comes from not far from our forecast area and may be indicative of processes occurring here. Be on the lookout for collapsing and whumpfing, especially in areas with a thin snowpack.

Avalanche Discussion

Our previously limited snowpack is now becoming complex as weather patterns have shifted due to our position in a trough. Stable snow does exist in the terrain but this stability trend is not increasing. Direct action avalanches such as wind or storm slabs are often straightforward to evaluate in the field, but the recent cold weather and mix of crusts that now exist should have you digging regularly as you move around in the field. 

A solo skier who was reported missing Tuesday evening was found Wednesday evening. The individual was buried in a terrain trap beneath the main gully of the Ammonoosuc Ravine following a ski tour to the summit on Monday. MWAC staff, Mountain Rescue Service and Fish and Game Conservation Officers extend our sincerest condolences to friends and family. 

 

Your avalanche, snowpack, or weather observations are extremely valuable to the forecasters at MWAC. Help create a more accurate avalanche forecast by submitting your observations here. 

Listen to the weekly MWAC Outreach Podcast provided by Ski The Whites. Discussions include snowpack information, weekend outlook, and general avalanche related info. 

Thursday, February 11 @ 7PM - Patagonia Films Event - Solving for ZIn this film, IFMGA Mountain Guide Zahan Billimoria explores his relationship with risk and reward in the mountains where stunning cinematography and engaging storytelling make this film truly stand out. This event is FREE and we are excited to host Zahan live at the end of the showing to answer some of your questions live! 

The Harvard Cabin is open for camping only with no entry allowed inside the cabin.

Please Remember:

  • Safe travel in avalanche terrain requires training and experience. This forecast is just one tool to help you make your own decisions in avalanche terrain. You control your own risk by choosing where, when, and how you travel.
  • Avalanche danger may change when actual weather differs from the higher summits forecast.

For more information contact the US Forest Service Snow Rangers, AMC visitor services staff at the Pinkham Notch Visitor Center, or the caretakers at Hermit Lake Shelters or seasonally at the Harvard Cabin (generally December 1 through March 31). The Mount Washington Ski Patrol is also available on spring weekends.

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