Today’s avalanche problem is wind slab. Winds ramped up last night, further scouring some areas while loading new snow in others. There is still a fair amount of icy old surface visible through the summit fog this morning but the larger pillows scattered around are large enough in the moderate rated areas to create concerns for human-triggered avalanches. Read on for more.
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The Sluice, Lip, Center Bowl, and Chute have Moderate avalanche danger. Natural avalanches are unlikely and human-triggered avalanches are possible. Heightened avalanche conditions exist in certain terrain features within these forecast areas.
Today’s avalanche problem will be in the form of wind slabs. Snow shower activity this morning, coupled with upslope snow showers this afternoon, may produce 2-4” of snow. This new snow will be falling on a refrozen rain crust with wind speeds in the 30-45mph range. Wind slabs sensitive to human-triggering may form in lee areas of a southwest wind and crossload in other areas. If wind and snow remain on the lighter side, expect only pockets of unstable snow. Snow totals near 4” with wind speeds at the upper end of the forecast velocity could develop larger areas of wind slab that will be harder to avoid.
This morning, there is a Low danger in the pockets of wind slab which developed on Tuesday. These are scattered in the steepest areas sheltered from a west wind like beneath the ice in the Lip and Center Bowl and in the mid sections of Chute and Left. Later today, it will become more possible to trigger these slabs as temperatures warm and rain falls. More wind slabs may develop on a south wind, this morning through mid-day, if new snowfall persists before changing over to rain. Anticipate the small pockets of older wind slab and any newer wind slabs developing today to become a wet slab/wet loose problem late in the day and overnight as heavy rain develops.
… Today’s avalanche problem continues to be Wind Slab. The 5-6″ (12.5-15cm) of low density snow that fell on Monday was delivered on moderate winds allowing for widespread wind slab to develop. Expect the most sensitive wind slabs to human triggers to be in the strong lee of mid-elevation Ravine terrain features such as under the Lip, under the Headwall, and above the narrows in the Chute….READ ON FOR MORE
Wind slab and avalanche danger will build throughout the day as winds increase. This wind slab will develop on very light density snow and is likely to be touchy even in Moderate rated areas. As the day progresses and loading continues, the likelihood of a naturally occurring avalanche and the potential size of an avalanche will increase, particularly in Considerable rated areas. Entering the floor of the ravine today will potentially put you in the path of avalanches.
Tuckerman Ravine has LOW avalanche danger. All forecast areas in Tuckerman Ravine have Low avalanche danger. Natural and human triggered-avalanches are unlikely. Watch for unstable snow on isolated terrain features. Huntington Ravine is under a General Bulletin. You will need to do your own snow stability assessments when traveling in avalanche terrain in Huntington. A […]
This advisory will expire tonight at 12:00 midnight. All forecast areas of Tuckerman Ravine have Low avalanche danger. Natural and human-triggered avalanches are unlikely. Watch for unstable snow on isolated terrain features. Huntington Ravine is under a General Bulletin. You will need to do your own snow stability assessments when traveling in avalanche terrain in […]
Spring hazards you need to know about include…very icy conditions make any slips or falls in steep terrain a very dangerous event. Stopping a fall can be near impossible on hard refrozen rain crusts. Using crampons and and an ice axe is helpful, but not foolproof…Multiple waterfall holes have opened in the Lip, including the open book hole responsible for a hiker fatality April 1, 2012…The Tuckerman Ravine Trail from Pinkham to Hermit Lake is wall-to-wall water ice for long stretches.
Tuckerman Ravine has MODERATE and LOW avalanche danger. The Lip and Center Bowl have Moderate avalanche danger. Natural avalanches are unlikely and human-triggered avalanches are possible. All other forecast areas in Tuckerman Ravine have Low avalanche danger with natural and human triggered-avalanches being unlikely. Lobster Claw, the Lower Snowfields, and Little Headwall are not posted […]
This advisory expires tonight at 12:00 midnight. Tuckerman and Huntington Ravines will have Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are likely. Dangerous avalanche conditions will exist. AVALANCHE PROBLEM: The Wind Slab avalanche problem discussed yesterday will begin as the first issue today. A rising temperature and rain showers will increase the potential for […]
AVALANCHE PROBLEM: Hard Wind Slab is the avalanche problem today. A period of snow, resulting in modest accumulations, ended about 28 hours ago culminating in very high winds gusting over 130mph (+208kph). You can expect most areas to be scoured of new snow resulting in a patchwork of hard slab that survived in the strongest lee areas of W and WNW winds. Anticipate variable surfaces and stability based on your location. Expect the easiest trigger point of hard slab to be on the outside edges where the depth is typically thinnest as well as shallow mid-slope spots that can be very hard to identify. Worldwide, these locations are classic triggering spots that users miss in their evaluations when skiing and riding.
This advisory expires tonight at 12:00 midnight. Tuckerman Ravine has Considerable and Moderate avalanche danger. The Sluice, Lip, Center Bowl, and Chute have Considerable avalanche danger. Natural avalanches are possible and human-triggered avalanches are likely. All other areas have Moderate avalanche danger. All forecast areas of Huntington Ravine have Moderate avalanche danger. Natural avalanches are […]
All forecast areas of Tuckerman and Huntington Ravines have LOW avalanche danger. Natural and human-triggered avalanches are unlikely. Lobster Claw, the Lower Snowfields, and Little Headwall are not posted due to a lack of snow in these areas. AVALANCHE PROBLEM: A remote threat of Wet Slab avalanches is the primary concern later this morning due […]
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This website is provided through a partnership between the White Mountain National Forest and the White Mountain Avalanche Education Foundation. The avalanche forecast applies only to backcountry areas, not operating ski areas, and describes general avalanche conditions which vary locally. The avalanche information provided is the sole responsibility of the USDA Forest Service.