Avalanche Writing That Doesn’t Bury Your Readers

Avalanche Writing That Doesn’t Bury Your Readers

The Avalanche Review 43.3 printed this article in spring 2025. Minor revisions here.

Have you ever started reading an article about avalanches only to find your mind wandering to distant powder slopes? You wanted to know more, but the article wasn’t worth the effort. Why?

Avalanches are hard to understand because they are complex events. They result from a soupy mix of terrain, weather, and snowpack. Add humans to the mix and avalanches become even more complex. For these same reasons, the very nature of avalanches makes them difficult to capture in words. Like legalese (legal writing that is hard to understand) and academese (excessive jargon in some academic writing), avalanchese is difficult to read and fails to increase safety. 

Here is a real example of avalanchese:

By offering an interpretation tool for the PST, we aim at enabling the immediate assessment of PST outcomes and at facilitating comparability between different geographical locations, terrain features, snowpacks conditions, etc., enhancing the transferability of these stability tests to potential hazards.

In contrast, if the writing is good—easy to read, relevant, and concise—avalanche professionals can share information more effectively to increase the safety of backcountry skiers. Written better, the avalanchese above might look like this:

We present a method to interpret the propagation saw test for different locations, terrain features and snowpacks. This method can help forecasters compare results and use those results to better predict avalanche danger. 

Write for Your Readers

Good writing requires that you write for your readers. Unless you’re journaling for yourself, keep your readers' level of knowledge in mind as you write. Doing this is difficult for experts because of what Steven Pinker in A Sense of Style calls the curse of knowledge. “It simply doesn’t occur to the writer that her readers don’t know what she knows. And so she doesn’t bother to explain the jargon, or spell out the logic, or supply the necessary detail.” Avalanche professionals, who know the topic well, often forget what it’s like to not understand avalanches.

The following are specific ways to avoid the curse of knowledge so that your readers will actually read your stuff (article, paper, post, or observation), and have a better chance at applying it to their own practice. 

1. Avoid Zombie Nouns

Unintelligible academese, legalese, and avalanchese are full of zombie nouns. Zombie nouns are simple words (e.g. compact) that have been turned into longer, more abstract words (e.g. compaction) by tacking on “-ion” or “-ize.” 

Documentation of observations is important when ski guiding. →  Ski guides should document what they observe. 

Compaction and stabilization of the slope is necessary. → The slope must compact and become more stable.

Zombie nouns tend to make your readers struggle to understand what you are saying. Your potentially life-saving writing will collect dust in the avalanchese stacks. Strive to use the simplest form of the word, which is the easiest to read and understand. Avoiding these zombie nouns also helps you avoid the passive voice and other pitfalls of writing—more on that below. 

2. Avoid Abbreviations

Sure, pack your notes and emails to cohorts with abbreviations, but when writing for the rest of us, please spell it out. Words instead of abbreviations let the sentence flow, pulling your readers through your writing. Unless an abbreviation is part of mainstream language—ETA, LSD—write it out the first time you use it, for example, “extended column test (ECT)”. Write it out again if it hasn’t been used in a while. If it’s short when written out, then just write it out every time. 

We measured ECTP on SW. →  The extended column test propagated on southwest aspects. 

I took a Rec 1 from OMS. →  I took a recreational level 1 avalanche course from Oregon Mountain School. 

3. Use the Active Voice

When possible, avoid passive verb forms of “to be” —is, was, were, there is, and there was. Speak directly to the reader in the active voice. In the active voice, the subject of the sentence performs the action expressed by the verb. Get rid of the verb “to be,” rearrange the sentence, and it becomes direct and vigorous. Also, if you, the writer, are doing the action, using the pronouns “I” or “we” will give your sentences life and make them easier to understand. For example, 

The food was eaten by the cat. → The cat ate the food. 

The observation was conducted... → We observed... 

Pits are dug by the forecaster. → The forecaster digs pits. 

Write as you would speak to your readers. Read aloud what you’ve just written. If it sounds turgid, pompous, or incoherent, fix it. Change the wording so that it flows in a natural way. Speaking your written words also helps detect when to switch to the active voice. 

4. Use Simple Words

If several words have the same meaning, use the simplest, most specific, and familiar, and use it consistently. Avoid ambiguous and abstract words in favor of concrete words that explain ideas in terms of human actions and sensory information. For example,

AIARE 1 → level 1 avalanche course

manage → reduce, avoid 

mitigate → get rid of 

Other ways to simplify wording include,

at this point in time → now

due to the fact that → because

a large quantity of → many

Writing with concrete and simple words shows that you know the subject, want your topic to be understood, and care about your readers. Add a few words to define technical terms. Even knowledgeable readers find comfort in already knowing some of what you are telling them. Plus, your writing will actually be readable and applied. 

5. Rewrite, Let it Cool, and Share

Putting words on paper is just the start. First drafts are rarely clear enough to get your message across. The meat of writing is rewriting, followed by rewriting, and then rewriting again and again. Eventually, your writing will appear perfect. It will make total sense and you’ll understand exactly what you’re trying to say. The problem is you’ve become blind to your writing. Let your article cool off for a day or two, then revisit it with fresh eyes. Better yet, let it sit for a week or a month before rewriting. You’ll be surprised by the gobbledygook you wrote earlier. 

Another important step is to share your draft with readers who you respect, partners or coworkers. They don’t need to be experts in your field; you simply want them to be able to understand your writing. Listen to what they say. If you feel like you need to explain something to them, go work on that sentence. If they say, “I think I understand what you’re saying,” they don’t. Go work on that part of your writing. If they only say, “Looks great!,” thank them and go find a more critical reviewer who will help improve your writing. 

References

• Chip Heath and Dan Heath, 2007, Made to Stick. 

• Steven Pinker, 2014, A Sense of Style. 

• William Strunk and E. B. White, 2000, The Elements of Style. 

• Helen Sword, 2012, Nominalizations Are Zombie Nouns, The New York Times.

Thank you for helping with this article: Emma Walker, Lynne Wolf, and Molly Stock. 

Skiing By Fair Means

In 1997 Adrian Nature climbed to the North summit of Denali and skied alone down the 14,000-foot Wickersham Wall, the biggest face in North America. Rumor has it, at one point the skiing became so steep that he tossed his pack, retrieving it further down. Then he fell but managed to stop. Hours later, Nature crossed the flooding Muldrow River. It was the first solo and continuous ski descent of the face. A feat accomplished using his own power, starting from the base of the mountain, climbing to the top and skiing back down. Nature skied the Wickersham Wall by fair means.

The term by fair means describes climbing mountains using your strength and ability, while not degrading the mountain to make the ascent easier. By fair means is the purest style of mountaineering. It follows a set of unwritten ethics established by the mountaineering community. The same concepts of mountaineering by fair means can be applied to skiing. 

By fair means was coined by English mountaineer Albert Mummery, who in 1880 backed off the coveted first ascent of the Dent du Géant, a 4,000-meter tooth of rock on the Mont Blanc massif in France. Upon defeat, Mummery said, "Absolutely inaccessible by fair means!" The first ascent of the Dent du Géant came later, in 1882, using iron stanchions, fixed rope and chipped steps. The route is now equipped with thick ropes for climbing hand-over-hand to avoid 5.10 rock climbing.

“Without style and ethics in the mountains, what do we really have?”

— Adam Fabrikant, 2024 AAJ. 

By fair means is a style of moving through the mountains. It describes the manner, skill and equipment used. For example, the best mountaineers use alpine style to move fast and light, as a self-sufficient unit up the mountain. Alpinists—those who climb in alpine style—avoid using fixed ropes, fixed camps, or bottled oxygen. Such as the recent alpine-style ascent of the north face of Jannu. Alpine style is the antithesis of expedition style, where high altitude mountains are climbed by any means necessary: large teams, bottled oxygen, porters, fixed ropes and bolts.  

“Imagine using a step ladder to dunk a basketball.”

— Mark Jenkins, The Elements of Style

For skiing, the most common style is mechanized skiing. A machine—chairlift, gondola, snowcat, snowmobile, or helicopter—lifts the skier to the top of the run. The difficulty of the mountain has been reduced, making it attainable for more skiers, like expedition style. 

Backcountry skiing is equivalent to alpine style. The skier starts at the base of the mountain, ascends the mountain using their skill and strength before making the run. The mountain is approached on its own terms, without using aids to make it easier, or degrading the mountain. 

Where exactly is the line between mechanized skiing and skiing by fair means? Most backcountry skiers use cars to get to the trailhead. What if a snowmobile is used for a ten-mile approach, before climbing to the summit? Is that backcountry skiing? Is that by fair means? It becomes an ethical gray area. In alpinism, the community has drawn an acceptable line. As the late alpinist Hayden Kennedy said, "It's not a kindergarten black and white...the naked free solo."

Part of what bolsters the credentials of skiing by fair means is that it foregoes a guaranteed outcome. While you may want to climb and ski a mountain, there’s a good chance you won’t. An equally likely outcome is to fail because of weather, avalanche conditions, strength or skill. The summit or a glorious descent are not guaranteed. By fair means requires a mindset shift to seeing failure as equal to success, and style as more important than success. It’s “more of an art and less of a conquest,” writes alpinist Kelly Cordes. We approach nature on its own terms and be challenged. Then nature often wins, like it's supposed to. 

“The quality of the experience and how we solve a problem is more important than whether we solve it. We strive to leave no trace.”

— Tyrol Declaration

Another beautiful aspect of skiing by fair means is that it’s slow. Not only does it take time to climb the mountain, but it takes years to acquire the skiing and avalanche skills. Those years of practice build appreciation for the mountains. Likewise, the time-consuming act of climbing the mountain gives more appreciation for the mountains, not just a myopic focus on the summit or the brief descent. The anticipation and delayed gratification of possibly skiing the peak, or arriving back at the base of the mountain alive, brings greater highs when success is achieved and greater lows from failure. All that leads to happiness. Ultimately, happiness is what we’re after. 

“It’s time we... searched again for the limits of possibility—for we must have such limits if we are going to use the virtue of courage to approach them. ”

— Rheinhold Messner, The Murder of the Impossible

A final positive note about by fair means is that it demonstrates a world-view. Backcountry skiers know that wild places on Earth are few. Skiing by fair means saves those wild places for everyone. Foregoing the archaic attitude of man over nature. 

Even the most diehard practitioners of by fair means find themselves in that ethical grey area. I use helicopters and airplanes for skiing. Sometimes to reach summits, sometimes to base camps and sometimes to fly to other countries to ski. My preferred method of skiing, though, is to park along the highway, skin and climb to a summit, and then ski back to the car. If I do use a machine to get up the hill, I try to acknowledge that there is a better style. That I am playing foosball, when I could be kicking a real ball. 

More Reading

• Albert, Jason and Fabrikant, Adam 2024, Grand Descents: A Half Century of Ski Alpinism in the Tetons, American Alpine Journal.

• Cordes, Kelly, 2014, The Tower: A Chronicle of Climbing and Controversy on Cerro Torre. 

• Messner, Reinhold, 1971, The Murder of the Impossible, Mountain #15. 

• Jenkins, Mark, 2005, The Elements of Style: It's time for a radical reform of high-altitude mountaineering and a fresh debate over what it means to climb right, Outsideonline.com, www.outsideonline.com/1909956/elements-style

• Kennedy, Hayden, 2012, The Enormocast, Episode 7, an interview with Hayden Kennedy: Alpine Taliban or Patagonian Custodian? Part 2. 

• The Tyrol Declaration on Best Practice in Mountain Sports, www.theuiaa.org/upload_area/files/1/tyrol_declaration(0).pdf

Rob Coppolillo

A shortened version of this article, along with photos from Matt Kennedy, appeared in The Avalanche Review in Fall 2024.

Rob Coppolillo, February 9, 1970 — April 18, 2024

On April 18 we lost one of our great mountain souls. Rob Coppolillo died from a crevasse fall while ski guiding on the Icefall Traverse near Golden, British Columbia. He leaves behind his wife Rebecca Yarmouth and twin 14-year old sons Dominic and Luca. 

Rob was a devoted father, husband, guide, writer, chef, story teller, and a friend to all. He grew up in Denver, went to college in Boulder where he lived in the road cycling scene, wrote about road cycling, and hosted legendary parties. Later in Boulder he shifted to climbing, skiing, and guiding. In 2015 he received his IFMGA Mountain Guide license, the Ph.D of mountains. With his family, he lived in Chamonix, France, then settled in Seattle where he continued to guide, teach avalanche courses, and write.

Rob was in his own category. He was a loyal friend with everyone, 300 of which were his best friend. “Preferring the hug to the handshake,” said Timmy O’Neil. Rob would give you all of himself, being fully present, fully engaged, bringing out the best in everyone. His constant dinner parties were full of Italian food, wine, friends, and laughter.

Rob was also known to be profanely funny, putting everyone in stitches, at humor that would have anyone else cancelled. “In one breath he could tell the dirtiest joke. In the next he could give you a lesson in Italian wines,” said Jimmy Mohan. “He’s Hunter S. Thompson meets Bill Murray,” said Bob Soderstrom. Extremely well-read, and he’s under the impression life is a performance piece. “It was this line between unbelievably endearing and totally inappropriate at all times,” said Rebecca.

“We, and the world, need more Rob,” said Timmy O’Neil

Rob thought outside the box in which most mountain guides could be placed. A voracious reader, with a diverse intelligence, and a mind further liberated by MDMA, he was open to ideas, absorbed them, and put them to use. He bucked the corporate America guide service norm in favor of working for himself and making a living wage when guiding and teaching avalanche courses. He was fascinated by the human mind and how we think in the avalanche patch. Writing took his curiosity and knowledge to the next level. 

In addition to many magazine and online article, Rob wrote three books. During his cycling years he wrote, Holy Spokes!: A Biking Bible for Everyone. When he shifted to guiding, he wrote The Mountain Guide Manual with Marc Chauvin and The Ski Guide Manual. Rob’s last article for The Avalanche Review—The Wolverine and the Mercenary (TAR 42.2)—shares how we tell ourselves stories, some of them detrimental when in the avalanche patch, and how we can turn those stories into safety. The article shows Rob as the perpetual thinker, “I started tinkering with this idea a couple years ago.” Then, later in the article, “Beware the skier/patroller/guide with only answers, never questions.” Rob shared plans for his next book that would go beyond guiding and help workers in other risky professions make better decisions and reduce risk. 

Perhaps his favorite method for exploring ideas was to debrief. “As soon as where we were out of the mountains his first question would be, ‘Where were we most at risk?’” Says IFMGA Mountain Guide Mikey Arnold, “It wasn’t about climbing or skiing the hardest. It was about being in the mountains, and then it was more than that, to understand risk, mindset. He had no hesitation with talking about what happened, whereas others would hole up.” 

If Rob’s accident had happened to anyone else, Rob would have circled up with guides and beers to learn, to avoid making that mistake himself, and help others avoid that mistake. Rob was a seasoned master at finding the learning points, without second guessing someones’ decisions. Rob may have reminded us to wear a tether from our belay loop to our shoulder strap when glacier skiing. He’d remind us to aim for skiing on glaciers with a thick seasonal snowpack that bridge the cracks. Rob would tell us the probe is our best friend on glaciers: probe for snow thickness, bridge thickness, and rest areas. He’d tell us to be diligent about group gear checks before heading out for the day. Most find this much diligence exhausting, turning a backcountry vacation into mental PowerPoint of checklists and acronyms, but Rob showed us how to make safety fun.

“Rob’s death was tragically unlucky,” said King Grant, who was with him at Icefall. Rob was a master at reducing risk. He was smart, cautious, and thoughtful in the mountains. He wasn’t pushing it. He didn’t deserve it. It was horribly unfair. All he did was take a step in wrong direction to take a leak. Just as us mountain guides have done thousands of times before. But we’ve been lucky. The mountains are dangerous and painfully unfair. We (I) need to be more diligent in the uncaring mountains. To be a safer and better person, like Rob showed us. 

We miss you so much brother. 

Urnal Facets: A Fourth Type of Near-Surface Faceting

This article originally appeared in The Powder Cloud, March 25, 2024. Minor revisions here.

Hey, Northerners! Have you ever skied soft snow, weeks after the last storm, that has been preserved by the mid-winter bitter cold? Some call it recycled powder or settled powder, but it’s actually an undocumented type of snow. Colloquially known as urnal near-surface facets. These facets may preserve good skiing while on the surface, but once buried, they often create a persistent weak layer for avalanches.

Urnal faceting is unique to the wintery north, such as central Alaska, where the sun doesn’t shine or its oomph has been filtered out by its low angle. This consistent cold, combined with clear skies, causes the snowpack’s top layer—30 cm—to maintain a steep temperature gradient that’s conducive to faceting.

Near-surface faceting produces a layer of small (up to 1 mm) faceted crystals on the top of the snowpack. In 1998, snow scientist Karl Birkeland presented three processes that form near-surface facets, depending on the source of the steep temperature gradient. 1) Diurnal near-surface faceting occurs from a daily cycle of warm days and cold, clear nights. 2) Radiation near-surface faceting occurs from a balance between incoming solar radiation and outgoing longwave radiation. 3) Melt-layer near-surface faceting occurs when new cold snow is deposited on a melted-layer and is followed by clear skies.

The different near-surface faceting processes are driven by changing the energy balance inputs; temperature, sun, or a melt-layer. It’s a continuum of processes. Birkeland also mentions a fourth category that occurs at high latitude, which is what we’re calling urnal facets, a term possibly coined by Alaska helicopter ski guide Henry Munter. It’s like diurnal faceting, but without the daily cycle. While urnal faceting is a specific term, it’s okay to simply call these near-surface facets, or surface facets. They often form together with surface hoar—the frozen equivalent of dew that forms a weak and persistent layer—producing a double whammy weak layer once buried.

The snowpack temperature profile during urnal faceting remains consistent during the cold and clear weather. It keeps a steep temperature gradient in the top 20-30 cm of the snowpack. At about 30 cm depth is a distinct kink in the temperature profile where it shifts to a shallow temperature gradient to the ground.

So, the big question is, why is the temperature profile kinked? It other words, why doesn’t the temperature profile become a straight line as a shallow temperature gradient throughout? I took this question to the world authority of near-surface faceting, Karl Birkeland.

Birkeland says that a number of influences keep the temperature profile kinked: 1) snow is a very effective emitter of longwave radiation, 2) space is really cold, and 3) when the sky is clear so much longwave is emitted that the snow surface just cools and cools. “Our sense is that the end result is that the rest of the snowpack is just unable to keep up with that heat loss, especially since conduction within the snowpack is not as efficient for energy transfer as longwave losses from the surface.”

The original diurnal faceting diagram from Birkeland’s 1998 paper. Urnal faceting is effectively the night portion (right side) of his diagram in which the snow surface is losing longwave radiation both night and day, while the temperature around 30 cm depth remains relatively warm.

January 2022 at Turnagain Pass was a good example of an urnal faceting and avalanche cycle. From January 1-7 the skies were clear, the air temperature was around 0°F, and the wind was light (Schauer and others 2023). A storm on January 8-13 brought snow, wind, and avalanches releasing on the buried layer of urnal facets. 

This chart shows the snow temperature at the Tincan study site at Turnagain Pass, Alaska during the January urnal faceting cycle. The vertical temperature profile (red line) shows a distinct turn in the temperature profile at 300 cm which is the snow surface. From about 300 cm to 270 cm the temperature gradient is steep—over 10°C per 10 cm—and well beyond the 1°C per 10 cm required for faceting metamorphism. At 270 cm the temperature profile kinks between the steep temperature gradient above and the shallow temperature gradient below. 

Small faceted crystals about 0.5 mm across formed by urnal near-surface faceting at Turnagain Pass, Alaska. 

For recreational skiers, it’s good to keep urnal faceting in perspective. It is yet another fascinating attribute of the snowpack. Having a keen interest in snowpack, and nature in general, is a good thing. But understanding the nuances of urnal faceting doesn’t necessarily improve your backcountry safety. What’s important here is that facets form a persistent weak layer once buried. Persistent weak layers are unpredictable and kill the most skiers. It doesn’t matter how they’re formed.

References

• Birkeland, Karl. 1998. Terminology and Predominant Processes Associated with the Formation of Weak Layers of Near-Surface Faceted Crystals in the Mountain Snowpack. Arctic and Alpine Research 30(2):193. 

• Schauer, Johnston-Bloom, McKee and Kennedy. 2023. Crusts and Facets: A Case Study of a Season with Deep Issues Near Girdwood, AK. Proceedings of the International Snow Science Workshop.

Avalanche Uncertainty Scale

The Avalanche Review printed this article in spring 2024. Minor revisions here.

Confidence? Are you kidding? Hell yeah I’m confident! I understand the snow and I can ski that slope. If it avalanches, I’ll ski out. What’s the problem?

Backcountry skiers have confidence. Lots of it. How else can we venture into big dangerous mountains where avalanches pummel down? This (over)confidence has been engrained in our psyche over millions of years for survival. The problem is, it doesn’t always help us avoid avalanches when backcountry skiing. To better avoid avalanches, it helps to shift our thinking to the antonym of confidence: uncertainty. By acknowledging that we don’t fully understand the avalanche problems, we can identify gaps in our knowledge, work toward reducing those gaps, and add margins for safety. For this article, uncertainty is defined as the lack of information, knowledge or understanding about avalanche problems. 

“One thing we know about risk management is that it tends to get worse when our uncertainty increases.”

— Ian McCammon

Currently, a scale of avalanche problem uncertainty doesn’t exist. A simple uncertainty scale would allow us to better incorporate uncertainty into our thinking and discussion, both at the recreational and professional level. This article describes the sources of uncertainty, proposes an avalanche uncertainty scale, and how to use it. 

CAA InfoEx Confidence Scale

The closest thing to an uncertainty scale are the Confidence Ratings (below) for the Hazard Assessment charts from the Canadian Avalanche Association InfoEx. Their definition of confidence is “an expression of the degree of certainty about a prediction of expected conditions in the future.” One option for an uncertainty scale is to invert the Confidence Ratings, so high confidence would become low uncertainty, and low confidence would become high uncertainty. This would be a good start, but more specifics would help.

High Confidence

The forecast is based on high-quality information and the nature of the issue makes it possible to render a solid judgement. A 'high confidence' rating does not imply fact or complete certainty however, and such judgements still carry the risk of being wrong.

Moderate Confidence

The information used to produce the forecast is credibly sourced and plausible, but it is not of adequate quality or sufficiently corroborated to warrant a higher level of confidence.

Low Confidence

The credibility or plausibility of the information used to produce the forecast is questionable, or the information is too fragmented or poorly corroborated to make solid judgements, or there are significant concerns regarding problems with the sources.

Sources of Uncertainty

Uncertainty can be from natural sources or knowledge sources (CAA 2016, Jamieson and others 2015). Natural sources (aleatory) of uncertainty include weather and snowpack variability over terrain. Knowledge sources (epistemic) of uncertainty come from limited field data or limited understanding about the topic. To best suit both recreational and professional users, a subset of sources are used in this scale. These sources include: 

1. Accuracy of field data.

Collecting different data reduces uncertainty, while more of the same data does not reduce uncertainty. Credibly-sourced field data will also reduce uncertainty better than poor field data. For example, the quality of data at Teton Pass can be as high as from the Alaska Range, but the accuracy at Teton Pass will be better because of the larger sample size. 

2. Problem uncertainty.

Each of the nine avalanche problems—or five in the European Avalanche Warning System model (EAWS 2017)—have different inherent levels of uncertainty. For example, dry loose problems have low uncertainty (higher predictive snow behavior), while deep slab problems have high uncertainty (low predictive snow behavior) (Wagner and Hardesty 2014). Uncertainty can also arise from any attribute of the current problem including type, location, likelihood (sensitivity and distribution), size, and danger (Statham and others, 2017). For example, weak layer distribution can have low uncertainty, as when a uniform layer drapes the terrain. Or distribution can have high uncertainty, as when a surface hoar layer was partially blown down before burial. 

Another way of looking at problem uncertainty is through the summary statement of avalanche danger. The middle of the danger scale, at moderate and considerable, tends to have higher uncertainty…it might avalanche. Contrast that with low danger, where uncertainty is usually low and it probably won’t avalanche. Uncertainty is also low at high or extreme danger where avalanches are likely or even certain…it probably will avalanche.

3. Effect of the next weather system.

Weather forecast further into the future, or for larger areas has greater uncertainty. For example, weather forecasters and/or models may be unsure if the approaching system will result in 0.5 or 2 inches of snow water equivalent, or how the next storm layer will bond to the old snow surface. Climate change adds further uncertainty to avalanche forecasts as historical records may not indicate current trends.

4. Skier knowledge, experience, and understanding.

A backcountry skier’s level of uncertainty about an avalanche problem may vary based on their level of knowledge, experience, and their understanding of avalanches. For example, a new backcountry skier may not be able to recognize an avalanche problem, while a more experienced skier could recognize an avalanche problem, but dismiss the uncertainty due to a high risk tolerance.

Avalanche Problem Uncertainty Scale

This scale is for the uncertainty of avalanches, including type, location, likelihood or size. Since avalanche uncertainty can not be calculated (Atkins 2023), users must use their own judgment to determine if a rating is appropriate for a scenario. The sources of uncertainty can be one or more of the sources listed above, in addition to the complexity of the interaction of the factors involved. This uncertainty is not the uncertainty, but it is your uncertainty, or the team’s uncertainty. 

This uncertainty scale can be used while trip planning, on guide meeting forms, in avalanche courses, and in avalanche-avoidance language. It is a sense-making aid to help skiers choose appropriate terrain and routes for the the conditions and team. It became an important addition to guide meetings and avalanche courses at our Alaska Guide Collective. Uncertainty discussions usually involve a reason for the uncertainty rating. For example, “I’d say we have high uncertainty above treeline because we haven’t been there in a week.” While this scale could be more specific, with checkboxes for each category, I have kept it simple for ease of use. This scale is not a refined or accepted scale, but rather the starting point to further discussion.

Low Uncertainty

The accuracy of field data is sufficient for confident decisions; the avalanche problem(s) have a predictable behavior; the effect of the forecast weather on avalanche conditions is well understood; or the team has sufficient knowledge and experience with the problem. Travel advice: Low uncertainty does not imply certainty and this judgment still carries the risk of being wrong. Apply normal caution and margins for safety. 

Moderate Uncertainty

The accuracy of field data is limited or of moderate quality; the avalanche problem(s) have a varied behavior; the effect of the forecast weather on avalanche conditions is uncertain; or the team has some knowledge and experience with the problem. Travel advice: Collect different field data which may reduce uncertainty. Use extra caution and wide margins for safety. 

High Uncertainty

The accuracy of field data is limited or of poor quality; the avalanche problem(s) have an unpredictable behavior; the effect of the forecast weather on avalanche conditions is poorly understood; or the team has little knowledge and experience with the problem. Travel advice: Plan route options that account for the low confidence. Maintain wide margins for safety including turning around. Collect different field data which may reduce uncertainty. 

References

• Canadian Avalanche Association InfoEx. 

• Bruce Jamieson, Pascal Haegeli and Grant Statham. Uncertainty in Snow Avalanche Risk Assessments, GeoQuebec. 2015.

• Dale Atkins. Uncertainty Versus Risk, The Avalanche Review 42(1) p28-32. 2023.

• European Avalanche Warning System, Typical avalanche problems, approved by General Assembly of EAWS. 2017. 

• Statham and others. A Conceptual Model of Avalanche Hazard. Natural Hazards. 2017.

• Wendy Wagner and Drew Hardesty. Travel Advice for Avalanche Problems, Proceedings of the ISSW. 2014.

• Technical Aspects of Snow and Avalanche Risk Management: Resources and Guidelines for Avalanche Practitioners in Canada. Canadian Avalanche Association. 2016. 

Thank You for Helping With this Article

Aaron Diamond, Andrew Schauer, Bruce Tremper, Dale Atkins, Elliot Gaddy, Henry Munter, and Nick D’Alessio.