The last thing I wrote was that your winter was being decided right now in October while there is barely snow on the ground. Now I want to talk about what might be the most useful tool you will have all season and the one many backcountry travelers interpret incorrectly: the avalanche forecast.
To be honest, in my early years touring I did the same. My problem was not that I could not read the forecast. I could tell you the danger rating, name the avalanche problems, point to the aspects on the map. My problem was that I was not interpreting it correctly and, more importantly, was not connecting any of it to the decisions I was making once my skis were on. The forecast lived in one part of my brain, and my ambitions lived in another. Like many others, my ambitions generally won.
I do not think that is unusual. I think this is where most of us live, new backcountry skiers and experienced ones alike, including the ones ducking out of bounds from the resort. You might think you understand the hazards. What we do not typically understand or fully process is our exposure to them. We do not often connect how the choices we make about where we go, how fast we move, and how much terrain we try to cover in a day might multiply the risk, even when the hazard itself has not changed.
The forecast has gotten better over the years at communicating what is out there. Researchers have studied how we read these things, and the format has evolved because of it. No format, however good, can make the connection for you though. That part is and likely always will be on us.
What the forecast actually is
First, the basics, because they are worth saying out loud. An avalanche forecast is not a computer model. It is a hypothesis. A professional forecaster spends the morning pulling together weather data, public observations from skiers and riders like you, professional observations from guides, patrollers, maybe even other forecasters, and then writes down their best assessment of what they expect to be living in the terrain that day. On high or extreme danger days, a center may also put out an avalanche advisory, a special warning on top of the regular forecast.
Hypothesis is the right word, and I mean it as a compliment, because a hypothesis is honest. It says: based on everything we know, here is what we expect to see. It is not a guarantee that a problem will exist, or will not, or that it will be exactly where the forecast says. The mountains are full of microclimates and micro terrain features, little pockets where the wind loads snow differently than everywhere around them. No forecaster can see all of that, and they would be the first to back that statement up.
It is also worth knowing what the forecast covers, and what it does not. A forecast only exists inside a forecast zone. The Shasta Avalanche Center covers the Mount Shasta area. The Sierra Avalanche Center covers the central Sierra around Tahoe. The Eastern Sierra Avalanche Center covers the east side. Huge parts of this country have no public forecast at all. If you are heading somewhere outside a zone, you might read the closest forecast you have got and understand you are making more of the decisions yourself. An avalanche forecast is incredibly useful, and it was never meant to be a stand-alone tool.
The forecast has three parts: the danger rating, the bottom line, and the avalanche problems, each with the forecaster reasoning behind them. Most people read the first and skip the rest, leaving the more useful parts on the table.
So what does the number actually mean
Here is a quick orientation, since the scale itself is continually evolving. For a long time it was just words: Low, Moderate, Considerable, High, Extreme. The numbers came later, and in the U.S. we currently use words, numbers, and colors together. Like snow science, the communication keeps getting refined. It will never be perfect.
Here is what the rating is actually telling you. It is an overall danger rating. It attempts to answer three questions at once: how likely are avalanches today, how large could they be, and how widely distributed is the hazard across the zone. It is not a rating of you, your skills, or your line. It is a rating of the day, across the zone, and it can change with elevation, aspect, even the time of day. For example, wind slabs might drive a Considerable rating above treeline while the same problem only warrants a Moderate below it.
Now here is the number worth really processing: nearly half of avalanche fatalities happen at Considerable. Not High. Not Extreme. I do not think that is a comprehension problem. I believe most people understand what Considerable implies. Instead, I believe it is a connection problem. They read the rating, and then they do not adjust their exposure to match it.
The forecast describes the hazard. It does not dictate your exposure.
In my courses I come back to five terms until students can use them in their sleep. I harp on hazard, consequence, uncertainty, risk perception, and risk tolerance. Plain version: the hazard is the thing that can hurt you. The avalanche. The tree. The consequence is what happens if it does. The uncertainty is everything you do not know, and in the backcountry there is always plenty. Your risk perception is what you think the risk is. Your risk tolerance is how much of that risk you are willing to accept before calling it quits. The forecast only speaks to the first three. The last two are yours alone.
This is where most of us tend to get into trouble as well. Most confuse understanding the hazard with managing their exposure to it.
For example, think about an Olympic ski racer. They move on snow at speeds most of us cannot imagine, reading the snow surface the whole way down. The course is groomed, packed, and mitigated. They can move that fast without generally thinking about consequences beyond their control, because the environment has been engineered to let them. Now put that skier next to a stand of trees at the same speed. They see the trees, and likely know the trees are a hazard. What might not register intuitively is how speed multiplies the risk of those trees, and how a small hesitation at that pace can turn a known hazard into a catastrophic consequence. There is no direct, felt connection between the speed and the hazard, and the consequences change directly with how fast they are going.
Now take that skier out of bounds. Same person, same speed, except now nothing is mitigated. I have watched this constantly in many areas I recreate: people want to move fast and get as many lines as possible for the day. I think this is because every line costs so much effort to reach that each one feels precious. Slowing down might feel like wasting the day.
This said, speed is exposure, and every additional line is another roll of the dice in terrain that inevitably still has some uncertainty around it. The hardest thing I try to teach, and the thing people resist most, is the discipline of going slow: ski two or three lines, take your time to look at the terrain on the approach. Maybe even go back to the same zone tomorrow, when you have traded a day of uncertainty for a little more familiarity. It is certainly the least glamorous skill out there, and it might be one of the most important ones.
The number is the headline. The problems are the story.
If the danger rating is the headline, the avalanche problems are the actual article. I read this part for years. Connecting it to my decisions has taken much longer.
Avalanche problems answer the questions the number cannot: what kind of avalanche are we talking about, where is it, how likely is it, and how big will it be. The forecaster lists each problem by name, and each name is telling you something specific. In our Level 1 workbook we work from the nine avalanche problems recognized by the American Avalanche Association. Learn to picture each one, because the forecast will name the ones in effect that day and the name tells you how to respond and how long the problem might stick around.
You will usually see three problems listed. That is not because only three exist. It is because three is about as much as a reader can usefully hold in their head before walking out the door. There might be five problems in the snowpack that day. The forecaster is showing you the three they are most concerned about.
Think about what that job is like: taking an enormous amount of complex information about an enormously diverse subject, the snowpack across an entire mountain range, and compressing it into something simple enough that someone with little to no avalanche training can read it and walk away with a logical plan. Three problems is a deliberate choice. It is the forecaster saying: if you understand nothing else today, understand these three.
Which means the forecast was never meant to be a complete inventory of every hazard out there. The problems that did not make the list did not go away. They are still in the snowpack. The forecast points your attention where it matters most, and trusts you to remember the rest still exists.
A wind slab problem means the wind has been loading snow onto leeward slopes, building stiff, cohesive slabs near ridgelines. The where matters as much as the what: specific aspects, specific elevations.
A storm slab problem means new snow has not bonded to the old snow yet. Fresh, touchy, often widespread during and right after a storm.
A persistent slab problem means there is a weak layer buried in the snowpack that is not going away. These are the ones that keep forecasters up at night, because they can linger for weeks and produce the big, unsurvivable avalanches. They often have a high amount of uncertainty around where they will fail, and a high amount of certainty about where this problem is living.
A cornice problem means the overhanging snow along ridgelines is getting weak. Cornices break further back than you would expect and can trigger the slope below, so give ridgelines a wide berth, especially when cornices are new or the sun is on them. Uncertainty around these often increases as the day goes on.
You do not need to memorize the whole catalog today. You need to understand the idea: the problems list is the forecaster handing you the day’s avoid-or-use-caution list, with locations attached. When a problem says wind slabs on north and east aspects near and above treeline, that is not trivia. That is your route plan editing itself.
Start with the bottom line
Just above the danger ratings, at the top of the forecast, there is a short summary a lot of people scroll straight past. Forecasters call it the bottom line, and the name tells you everything. It is essentially the whole forecast distilled into a few sentences. It answers three questions: what is the problem, where is the problem, and what should you do about it.
That is the section to read first, every time. It is the forecaster looking you in the eye and telling you the single most important thing about today. It reads like this: Heavy snow and strong winds will create dangerous avalanche conditions as the day progresses. Steep, wind-drifted slopes near and above treeline present the greatest hazard. Stick to mellower, sheltered terrain for better visibility and safer travel, and watch for shallowly buried obstacles under the fresh snow. (4/11/26 Shasta Avalanche Center forecast by Christian Jordan)
If you read nothing else, read the bottom line. Then keep going into the problems and the discussion for the full picture. The bottom line is the foundation, not the house.
How to actually use it
Okay, practical part. Here is the routine I would recommend, the one I wish someone had handed me 25 years ago.
Read the entire forecast, not just the number or rating, even the weather section. Read it all, the night before and the morning of. Some forecasts update in the morning, and some in the evening, and some might even update both.
Know which forecast zone you are standing in. This sounds obvious until you are touring near a zone boundary and you read the Tahoe forecast out of habit when you are actually skiing the east side. The zone you are in is the primary one you need to know.
What about when you are not in a forecasted zone. That happens more than it used to. People are pushing further into the backcountry every year, finding terrain no public forecast covers. I run into this all the time in courses: people who honestly do not know how to make decisions out there and are finding themselves out there more. The uncomfortable answer is that you have to become your own forecaster for those zones. That means understanding how avalanche problems develop, where they are likely to live, and building an honest understanding of spatial variability and continuity. That takes years in different snowpacks and terrain. However, it starts where you are at, with the simple pieces, one at a time, until you can put them together yourself.
Read the discussion. Most forecasts include the forecaster reasoning, and it is where you learn to think like one. Over a season, this is genuinely how you get better at developing your own hypotheses: osmosis from professionals. In the workbook we point this out directly: the forecast ties wind, temperature, and new snow together. Read the weather discussion and you will know which avalanche problems the forecaster is worried about and why.
Check it with the weather forecast, not instead of it. The avalanche forecast tells you about the snow. The weather forecast helps paint a picture for you of what is about to happen to it. You need both.
Slow down out there. Take 2 or 3 lines instead of 6. Assess the terrain as you go, and maybe go back to the same zone tomorrow with a little less uncertainty. Speed is exposure, and the mountain is not going anywhere.
Read it even on the mellow days, especially on the mellow days. The habit has to be automatic. In my previous article, I suggested to start reading the forecast now. I meant it.
What the forecast cannot do
Here is the honest part, and it is the most important section in this piece. In my courses I say this until people are tired of hearing it: the forecast is a hypothesis, and the terrain is where we test it. Think of the forecast as the control group and the mountains you walk into as the variable. We might know it snowed. We might know the wind blew. Unless someone stood on that exact slope and wrote a forecast for it, everything in that forecast is a hypothesis about what actually happened there.
Some days the hypothesis holds up beautifully. You find the wind slabs exactly where the forecast said they would be, on the aspects it named, and the system feels airtight. Other days you find the problem somewhere completely unexpected, or you find nothing where the forecast was certain, and you are reminded that the map is not the terrain. Both outcomes are normal. That is what a hypothesis does. It is right until the field says otherwise.
There is something else the forecast cannot give you, and something the mountains often will not either. Snow does not always give you feedback. You can ski a slope with horrible structure, high potential for propagation, very low friction, and enough snow to bury you, and get away with it completely. No collapsing, no shooting cracks, nothing. The next person to ski that same slope, loading it just a fraction differently than you did, can trigger the whole thing. We live in a world built on constants and obvious outcomes, on if this then that. Snow refuses to play along. Some of what happens out there is still beyond our understanding, and the forecast, good as it is, cannot close that gap for you.
A Low day still contains uncertainty. The forecast cannot see the wind-loaded pocket behind the ridge you are about to ski, and it cannot tell you whether your group is communicating or just nodding along.
So, treat the forecast as the starting point of your decision, not the decision itself. It tells you what questions to ask. It does not answer them. The answers are out there under your skis, and part of your job is to go find out whether the hypothesis survives the day.
Reading about avalanches every morning with coffee is not the same as training. I mean that as someone who writes about this stuff: the words are useful, and they are not the thing. The thing is days in the field with people who know more than you, who know less than you do, and test hypotheses to get feedback, which is the entire reason avalanche courses exist.
The deal
I want to tell you why I care about any of this, because it is not the reason you might think. I teach avalanche courses at the professional level and the recreational level, and every year I present several free awareness seminars all over the western U.S. I will not get rich doing this. I have bills to pay like anyone else, and that is true. However, teaching has never been about money for me. Like the reason I guide, instructing courses is personal.
I have seen what it looks like when people do not come home. I have felt it myself. I know people who have not come back. I know people who survived and carry the guilt. I have watched the stigma land on people who made mistakes, people who triggered avalanches on their own tours, and I have watched that shame follow them for years. I have been on search and rescue missions that don’t end the way we’d like. I have met people still trying to cope with something they were involved in or that happened to someone in their group over a decade ago.
It is my personal mission to get people to really think through their decisions, knowing they may make the wrong one. They may have already made the wrong one and gotten away with it. I want people to do their very best, because I do not want them to carry the stigma or pain of a mistake. I do not want anyone to have to tell their partner’s spouse or family, why someone is not coming home.
I teach because I want people to come home to the people who love them. I want people making decisions with their eyes open, because those decisions do not just affect the person making them. This is how I try to bring people back to their families, to their loved ones. To make them think just a little bit longer about whether it is really worth it.
I will give you an example. Most times I ski inbounds at the resort, I am still with my transceiver, shovel, and probe. Not because I am worried I will trigger something on myself, or that my partner will within the resort boundaries. It is because I never want to hear that voice that says: if only you had had your gear, maybe you could have helped. Somebody ducks a rope into the sidecountry, ignorant of the risks, and something goes wrong, and I do not want to stand there empty-handed. I hate the term sidecountry, by the way. It is the backcountry with a lift next to it.
I do this because I love it, and because I genuinely care whether strangers come home. So, I encourage you to take the time to learn the language now, while the stakes are little. Read the forecast in the morning. Test the hypothesis in the afternoon. By the time the snow really starts to fall, you might not be fluent, but you should know some of the language.
Next time in this series: weather. Storms do not just bring the snow, they build the snowpack, layer by layer, and if you understand what the sky is doing you can start to predict what the snow will do. See you in a couple weeks.
This is the first of a series walking through the pieces of a Level 1 avalanche course, one at a time. If you want the next installment, follow us on social media, or check back on our website weekly.
Written By Caleb Burns
SWS Mountain Guides runs avalanche courses all winter in Mount Shasta, Bear Valley, and Mount Charleston.
A note on what this series is and is not: These articles are not a replacement for an avalanche course. There is no substitute for time in a classroom and time in the field with a qualified instructor, learning in real conditions with feedback on your decisions. These pieces are only meant to share information that might be useful as you start paying attention. If you travel in avalanche terrain, take a course from a recognized provider of the American Avalanche Association.