Posts

Avalanche Fatality, Ammonoosuc Ravine

Wednesday, February 3, 2021, a NH Fish and Game officer contacted the lead snow ranger at the USFS Mount Washington Avalanche Center to ask for assistance in locating the vehicle of an individual who was reported missing on Tuesday night, Ian Forgays, a 54 year old male from Vermont. Recent communications between Ian and his friends suggested that he had been planning a day of backcountry skiing, either in Ammonoosuc Ravine or Monroe Brook on the west side of Mount Washington, on Monday, Feb. 1, prior to the start of a significant winter storm arriving Monday night and continuing Tuesday.

Human-triggered avalanche in Left Gully

Events:

On January 22 at 3:20 pm, a skier was caught by an avalanche triggered by his party and carried from near the top of Left Gully almost to the floor of the ravine. A ~six inch slab of new and wind deposited snow released from the uppermost start zone from skier 2’s feet as skier 1 made their first turn. Skier 1 was quickly swept into and under the moving debris and lost their skis and poles. When the flow stopped, they found themselves buried face down, fortunately with their head very near the surface, but the rest of their body buried by two feet or more of debris. They were unable to move but could raise their head for a breath.

Skier 2 did not see their friend and skied away. (Edit: Skier 2 found their friend but, without a shovel, was unable to dig them out.) Ultimately, skier 2 alerted others down by the Connection rescue cache. Bystanders closer to the scene began to dig out skier 1. Others arrived, including Hermit Lake and Harvard Cabin caretakers and later, snow rangers, to assist.

Analysis:

Just prior to the avalanche, a snow ranger suggested to the two skiers, who did not have beacons, shovels or probes, that they ski the lower angled slope between Right Gully and LC or the lower section of Left, if they skied anything at all. They later told snow rangers that the excitement of new snow drove them to the top and into the upper start zone where the incident then unfolded. These two were very helpful to the community by honestly sharing their story with snow rangers.

There were no natural avalanches reported that day which carried a Moderate danger rating, though the forecast included possible human triggering of D1-2 wind slabs. This pair was among many poorly equipped skiers or skiers traveling alone. Low visibility marked conditions for the day with periods of moderate snow squalls and minor wind loading at the tops of gullies.

Reading the forecast carefully, applying safe travel techniques, and carrying the proper equipment are fundamental to recreating in avalanche terrain. It is critical to acknowledge that the majority if avalanche incidents and fatalities occur in Moderate danger rating days where the avalanche hazard may include the potential for isolated, stubborn but large avalanches OR widespread, smaller avalanches, such as this day. Both can carry real consequences.

Left Gully, Tuckerman Ravine.  Photo taken three days after the event: 1/25/2021

 

Editors note: Skier one’s skis were found later and returned by a good samaritan. Also, Skier One reported that his GPS watch recorded a total vertical drop during the avalanche of 850′ and a max speed of 53 mph. 

April 11, 2019 Avalanche Fatality, Raymond Cataract

Around lunchtime on Thursday, April 11, 2019, two hikers took a break on the summit of Lion Head. This ridge separates Tuckerman Ravine from a stream drainage to the north known as Raymond Cataract. While on Lion Head, they noted a skier descending into Raymond Cataract, an ephemeral, but recently popular ski descent only possible during winters with a deep snowpack.

The hikers remarked on the solid and skillful turns the skier was making and watched him descend out of view. At the same time, two skiers skinning up the Tuckerman Ravine Trail watched a solo skier make a couple of turns in upper Raymond Cataract and then returned their focus to skinning. Unknown to anyone, within a few turns of both sightings, Nicholas Benedix would ski over a convex 39 degree bulge and trigger a fatal avalanche.

NHPR at Hermit Lake

We had the privilege of spending the day with Sean Hurley from NHPR a couple weeks back. Here are the results of tour of the east side in in pictures and audio. Once again, Lily proves herself to be the most popular and interesting snow ranger while Sean demonstrates one of the most soothing and mellow voices on the radio today. 😉

Got a Mount Washington or Presidential Range tale to tell. Contact Sean at NHPR.

Human Triggered Avalanches

On April 7, 2018, seven avalanches occured in Tuckerman Ravine. All were human triggered. This write-up discusses the weather and snowpack that lead up to these events, an objective summary of the events, and an analysis of factors that lead to at least five people being caught in one of the avalanches.

Weather

In the week leading up to April 7, 2018, our snowpack saw two rain events. The first was March 29 and 30 which delivered 0.75” of rain followed by 0.32” of rain on April 4. Both of these rain events were followed by hard freezes. On Friday, April 6, light snow showers began just after noon and continued through sunrise the following day. By the time snowfall stopped, the snowplot at Hermit Lake recorded 16cm (6.3”) of 9% snow while the summit recorded between 7 and 8” (this is an estimate based on hourly observations as the total snowfall was recorded as less due to excessive blowing snow) of snow. When snowfall began on Friday, wind at the summit was around 30mph from the south. Overnight, wind direction shifted to the west and speeds increased to 60-70mph. Weather on Saturday April 7 was clearing skies, winds diminishing to around 40mph from the west, and temperatures in the single digits on the summit and reaching into the 20sF at Hermit Lake. This weather pattern built a robust melt-freeze crust over which wind slab was built from new snow and wind April 6-7. This touchy wind slab was the avalanche problem involved in all known avalanches on April 7.

Summary of Events

During the morning of April 7, three avalanches were intentionally triggered by skiers. All three were ski cuts, two occurring in Lobster Claw (both SS-ASc-R1-D1.5-I) and one occurring on the rollover of the Little Headwall (SS-ASc-R1-D1-I). Slab depths were up to 14” and all occured on a layer of softer snow immediately above the melt-freeze crust. Of note in the Little Headwall was that the second skier through was able to trigger the “hangfire”, or slab remaining above the crown of the initial avalanche.

Examining the crown in Little Headwall. MWAC photo.

We have less definitive information on the Left Gully and Chute avalanches, which occurred shortly before and after the Hillman’s Highway avalanches, respectively. We believe that no one was caught or carried by either avalanche, both of which were triggered unintentionally. Left Gully, which was rated Moderate, produced an avalanche from a relatively thick though isolated pocket, while Chute, which was rated Considerable, produced a larger in area avalanche from a thinner slab. Both are estimated SS-ASu-R2-D1.

Unlike the other avalanches this day, the avalanches in Hillman’s Highway did involve a number of people being caught and carried. At approximately 2:00 pm, at least 40 people were climbing and skiing in Hillman’s. An individual climbing uphill from the looker’s right fork to the looker’s left fork triggered the initial avalanche as they entered the looker’s left fork. This person was not carried in the slide. The crown of this avalanche was approximately 300’ below the top of Hillman’s and ran ⅔ of the way down (SS-AFu-R2-D2-I). Of the many people in the avalanche path, at least 5 were caught and carried. USFS Snow Rangers responded to the incident and identified one injured skier who was ultimately transported to Pinkham Notch with a back injury that was not life threatening. Another individual who was also caught and carried sustained a minor injury to their hand.

Looking at the crown of the first avalanche in Hillman’s Highway. Photo by Kurt Schleicher.

The second avalanche was triggered around 2:30pm, within minutes of the initial Snow Ranger team arriving on scene. The trigger was unknown at the time, but consensus of bystanders is that this second avalanche was triggered by the same individual who triggered the first, having topped out on the ridge and beginning to ski the hang fire slab above the initial crown. This second avalanche was smaller (SS-ASu-R2-D1-I) and luckily did not capture any people or result in injuries.

Analysis

Many opportunities for learning are presented by this day which which fortunately did not involve more serious injuries. First, it’s an excellent reminder that avalanche conditions can develop during the spring months which bring crowds of backcountry skiers to Tuckerman Ravine. As with any time of year, these avalanches can widely vary in size and character. Avalanches can be of minimal concern on certain spring days, but April 7 was a day with avalanches as the primary concern for alpine travelers. On any such day, anyone venturing into avalanche terrain should bring a beacon, shovel, probe, and knowledge to use them effectively.

Carrying avalanche rescue gear is a cardinal rule for travelling in avalanche terrain. Another is travelling one at a time through areas exposed to avalanche danger. This requires recognizing avalanche terrain, which includes both terrain capable of producing an avalanche and terrain threatened by avalanches. A phrase often heard in the courtyard is, “It’s just Hillman’s”. All of Hillman’s Highway is avalanche terrain. On top of that, it’s easily the biggest gully in Tuckerman Ravine and is particularly confined. Exposing one person at a time to avalanche danger is crucial, particularly on a day like April 7. It’s likely that nobody would have been injured had this been the case.

Avalanche danger was Moderate in Hillman’s Highway on this day, which forecasts natural avalanches as unlikely and human triggered avalanches as possible. These possible human triggered avalanches can be either small and in many areas or large and in specific areas. With a number of similar avalanches in other Moderate rated areas, we consider April 7 as a small avalanches in many areas kind of day. It’s worth noting that a Moderate rated day for large avalanches in specific areas is sometimes referred to as “scary moderate”, in which you’re less likely to find signs of instability but potentially able to trigger a large avalanche. Further, remember that even small avalanches can ultimately be fatal.

The Chute was rated Considerable and produced a slightly larger in area avalanche from a thinner slab. The primary distinction between Moderate and Considerable is increased likelihood of both natural and human triggered avalanches with greater chance for larger avalanches. Other Considerable areas received little if any traffic, which we suspect is a reason that more did not produce avalanches.

All avalanche problems exhibit some degree of spatial variability. This means that the snowpack is not uniform across the terrain and avalanches can often only be triggered from specific locations. A number of people can travel on a slope, particularly one as large as Hillman’s, before someone finds this specific location and triggers an avalanche. Tracks on a slope do not mean it’s safe to ski or climb.

The Little Headwall was not rated on April 7 for lack of snow, but did have enough snow in one isolated pocket to produce an avalanche. Unrated terrain, which encompasses all of our terrain early and late in the season, can produce avalanches. The human triggered avalanche in Central Gully on Dec 1 of this season is another example. We do issue danger ratings for areas of most concern during the bulk of the season in Tuckerman and Huntington Ravines, but avalanche activity is not confined to areas forecast on a particular day.

Finally, we should touch on ski cutting. The avalanches in the Little Headwall and Lobster Claw were intentionally triggered in a controlled manner through ski cutting. This process of intentionally skiing a specific part of a slope likely to trigger an avalanche, with speed and from one safe zone to another, is an advanced practice and is only appropriate under certain conditions. A book could easily be written about the practice of ski cutting, but a simple explanation is that it is only wise when you possess a high degree of certainty about what the the ski cut will produce AND the consequences if you’re wrong. In particular, ski cutting is inappropriate when an avalanche may initiate above you. On April 7, we had the rare conditions for our terrain in which instability was limited to surface slabs and individuals were able to ski potential start zones for isolated and small pockets of wind slab. Certainty was high both in terms of anticipated result and consequences for being wrong, and avalanches above the individuals ski cutting were nearly impossible. Further, other people were not in the potential avalanche runout zones.

Brody Leven ski cutting in Lobster Claw. Photo by Lincoln Benedict.

The human-triggered avalanches on April 7 did result in injury, but everyone on the mountain lived to ski and climb another day. Luck certainly contributed to this relatively positive outcome, as did the relatively small but widespread type of Considerable and Moderate avalanche danger that day. We who like to travel in avalanche terrain rarely get such valuable lessons without more serious outcomes. Great turns can be had with minimal risk on such days, but only by choosing terrain that matches your preparedness, knowledge, certainty, and skill level.

Human-triggered avalanches, Hillman’s Highway & Gulf of Slides

On Saturday, March 10, 2018, two separate avalanche incidents were reported. During the previous 2 days, 14.5″ of snow was deposited at Hermit Lake from a nor’easter and the upslope snowfall that followed. This storm was accompanied by moderate winds that rose to the 60’s mph the afternoon before. Saturday’s advisory called for 4.5″ more snow with increasing wind shifting slightly to the NW. Avalanche danger was rated Considerable in Hillman’s Highway, along with Left Gully and the Headwall forecast zones.

Around mid-day, a party of three talked with a snow ranger on duty who advised that low visibility and continued wind loading made their plan to travel into Hillman’s Highway unwise. The party hiked to Hillman’s and entered the 75′ wide couloir onto a 15-20 degree section of the otherwise steeper runout. Soon after the party returned to the courtyard and reported that everything the snow ranger had cautioned against had played out. Two were struck by debris, knocked down, and carried downslope. Fortunately, much of the energy of the debris flow was absorbed by boulders and holes from a warm spell which reduced our snowpack substantially. When the threat of natural avalanches occurring is elevated, the risks are as well. The natural avalanche that occurred in Hillman’s Highway was much larger and would likely have been unsurvivable.

The same day a party of two skiers set a skin track near the middle gully in the Fingers area of Gulf of Slides, in sparse trees. As the terrain steepened, they began to boot along the left edge of the gully next to the trees. The snow was loose and dry with “no shearing and bonding felt okay”. The first skier had been to this area many times and stayed out of the gully as they made their way towards the rollover near the top. They had spread themselves out as they moved up the slope but paused as they reached the rollover because “something felt wrong”. In moments, the slab failed a “couple hundred feet above” the party and hit both skiers. The first skier was carried but, being on the edge of the gully, he escaped the main flow of debris while the other skier clung to a nearby bush. The skier that was carried turned his beacon to search and could not locate a signal of his partner, who was still above him. Shortly after the caught and carried skier texted for help on his cell phone, the pair made contact and eventually were able to call off the rescue response. The skier who held onto the bush lost his poles while the skier who was carried lost all his equipment though eventually recovered one ski.

Later conversations with the skiers in Gulf of Slides revealed a debate as to whether or not they triggered the slope. They considered it likely that they did not trigger the slope, but rather that it had avalanched naturally. From our perspective, the trigger is relatively unimportant in this instance. If the avalanche had not released while ascending, it is possible that they could have made it to the top and triggered the slope on the way down. In that case, much more of the slab could have been above them with more serious consequences likely. After some reflection, looking at weather data and reading the avalanche advisory, the triggering skier admitted that “overconfidence due to personal experience” in that particular area led him to ignore the obvious red flags that existed due to the snow and weather conditions that day. After the period of warm weather and ice crust which had dominated recent ski conditions, it seems likely that the scarcity heuristic was in play as well. The call of fresh powder is hard to ignore sometimes but it is important to remember that good luck can play a role in good outcomes like this one and luck is one thing no one can count on.

Avalanche Accident – January 17, 2016

The following news release was issued by the White Mountain National Forest Sunday evening, January 17th. A more comprehensive accident summary and lessons learned will be posted later.

Two Climbers Trigger Tuckerman Avalanche

Early on Sunday afternoon, January 17, 2016, two climbers from Canada triggered and were caught by an avalanche in “The Chute” located in Tuckerman Ravine.

Just before 1 pm, the climbers ascended the couloir on the left side of the Ravine. Four other skiers and an avalanche class were nearby at the time. The pair of climbers reached the narrow point of the slope after climbing several hundred vertical feet from the floor of the ravine on a steepening slope. They climbed over an old fracture line a foot to a foot and a half high and continued into softer snow. After ascending approximately 30 more feet through deeper snow, the climber in front felt that the slope may be unstable and decided to turn around. As they turned to descend, the slope fractured about 75-100’ above them and approximately 75-100’ wide. The two climbers were carried most of the distance to the Ravine floor.  Two of the three nearby skiers were also caught and carried varying distances by the debris as well, while another skier below was able to dodge the debris. (see correction below)

One of the two climbers, Michel Houde from Lorraine, Quebec, sustained non-life threatening injuries and was treated and released by Snow Ranger staff and the Mount Washington Volunteer Ski Patrol. One of the skiers, Kaj Huld from Brunswick Maine, also received non-life threatening injuries. Members of several nearby avalanche classes assisted in transporting the second climber by litter to Hermit Lake where he was transported by snowmobile to Gorham EMS waiting in Pinkham Notch.

The Mount Washington Observatory reported 5.5” of snow on the summit during the previous day, with around 4” falling at Hermit Lake. Summit winds blew between 40 mph and 60 mph overnight from the west. Plumes of wind transported snow were visible in the morning as Snow Rangers made snowpack assessments. The wind shifted to the NW and diminished to 20 mph when visitors began to enter Tuckerman.

Each year from December 1st through May 31st, the US Forest Service is the lead agency coordinating SAR missions on the eastern side of Mount Washington which includes Tuckerman and Huntington Ravines.  The White Mountain National Forest operates the Mount Washington Avalanche Center to provide safety information and SAR services to the public.   The Avalanche Center had posted a General Bulletin Saturday Morning, January 16th ,on www.mountwashingtonavalanchecenter.org for the holiday weekend. A brief follow up analysis of the incident will be post on the website this week.

#######end#####

Correction: the solo skier who is described as having “dodged the debris” was indeed hit and injured by the avalanche. In total, six people were in the path when it released. Only one was able to avoid being caught. Two of the five caught were injured. Broken down by group: of the two climbers who triggered the slide had one was injured; of the group of three, one escaped while the other two were caught, carried, and thankfully uninjured; there was also the aforementioned solo skier traversing his way low in the track toward Left Gully.