Lawinenlagebericht

Presidential Range

Mount Washington Avalanche Center
Auf der Karte ansehen

Lawinengefahr

Thu
Hochgebirge
1 · Gering
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
Open full map
Veraltet — dieser Lagebericht ist 3 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Strong winds have created isolated areas of unstable snow that could be triggered by a human. South and east facing aspects in the middle elevations are likely places to find wind drifted snow capable of producing a large avalanche. Look for wind actively moving snow across ridgelines as an indicator where drifted snow is being deposited.

Lawinenprobleme

  • Wind Slabs

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

    Many hours of extreme winds ravaged the upper and middle elevations of our Presidential Range, removing much of the recently fallen snow and placing it lower on the slopes. Alpine locations exposed to the wind are firm with wind-board surfaces that are Pencil hard with little to no avalanche potential. Leeward facing slopes in the middle elevations may be refilled with wind-transported snow from the alpine fetch. North and northwest winds overnight will have put the recently drifted snow onto south and southeast slopes, giving this location a moderate avalanche danger today.

    With an additional 1.4 inches of new snow yesterday, expect to find drifted slabs with variable hardness in the middle elevations. We have added the southwest aspects of the upper elevations as an outlier in the avalanche problem today. This is in response to the leftover snow that may not have yet been affected by winds from the northeast, which we will experience this morning. It is likely that the new snow has formed isolated pockets of softer slabs in confining terrain features on sheltered lee aspects facing south and east. Many of the slabs may be stubborn to human triggering with a few that could remain potentially reactive in wind protected areas. Cracking of the surface snow as you step onto a drifted slab is an indicator that there is an instability.

Avalanche Discussion

North and northwest winds have displaced most of the dry snow to aspects facing south and east. With gusting winds to 75 mph, expect firm surfaces in much of the upper and middle elevation areas exposed to these winds. Slopes facing away from the direct winds may have softer slabs with a potential for human triggered avalanches which could bury a person. 

As winds shift slightly out of the northeast today there is a possibility that snow, not eroded from the previous winds, will be picked up and moved to the southwest aspects in the middle and upper elevations. Look for banners of snow streaming from ridgelines indicating where the snow is being transported to. 

Today’s drifted slabs will be variable in hardness and isolated in distribution. Use strategic planning and route selection to avoid these deposits of unstable snow. Test in multiple locations the sensitivity and thickness of the slabs. Approach steep and confining terrain cautiously where the avalanche problem is expected, and feel free to back away from locations where cracking or hollow slabs exist. 

The Lion Head Summer Trail is CLOSED due to increased avalanche hazard. The Lion Head Winter Route is OPEN and the most direct route to the Mount Washington Summit from Pinkham Notch. 

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. 

Abgedeckte Regionen