Decoding the BRA: How to Read the Météo-France Avalanche Bulletin

01The number is the headline, not the story

To read an avalanche bulletin, work top to bottom in one fixed order: the danger level (1–5) and its elevation split → the named avalanche problem(s) → the aspect/elevation rose → the natural-vs-triggered breakdown → the snowpack narrative and trend — then overlay all of it on your own route's aspects, elevations and timing. The danger number is just the first line. In France that document is the BRA — the Bulletin d'estimation du Risque d'Avalanche — published by Météo-France for every mountain massif, and this guide decodes it line by line so you can turn it into a go/no-go the night before a tour.

Most skiers read the avalanche bulletin the way most people read a weather app: they look for one number and close it. "Risk 3 — okay, careful day." But the danger rating is the headline of the bulletin, not the article. Almost everything that will actually keep you alive — which slopes are dangerous, at what elevation, on what aspect, at what time of day, and whether the snow will release on its own or only when you load it — lives in the paragraphs and pictograms below the number. Skiers who stop at the rating are reading the cover and skipping the report.

This matters because of a well-documented and counter-intuitive fact: **most avalanche fatalities happen at danger level 3 (Considerable), not at the higher levels.* Level 4 and 5 are rare and obviously frightening, so people stay home or stay low. Level 3 looks moderate, the sun is out, the rating "feels" manageable — and that is exactly the trap. The bulletin is trying to tell you how* to ski a level-3 day safely (which aspects to avoid, where the buried weak layer lives, when the warming turns the south faces dangerous), and that information is in the text you skipped.

This article is a decode of the BRA — the Bulletin d'estimation du Risque d'Avalanche published by Météo-France for every French massif — read line by line, the way you should read it the night before a tour. The BRA is one of the densest, most information-rich bulletins in the Alps, and once you can read it fluently you can read any of them. So after the French bulletin we'll map the same information onto the Italian (AINEVA), Swiss (SLF) and Spanish (AEMET) bulletins, because the underlying framework — the European Avalanche Warning Services (EAWS) standard — is shared across all of them. Learn one well; recognise them all.

A blunt caveat before we start: this article teaches you to read the document. It is not a substitute for an avalanche course, for the bulletin itself, or for your own observations in the field. The bulletin is a regional, day-before estimate written by a forecaster who is not standing on your slope. Read it, then verify it with your own eyes.

02Where and when is the BRA published?

The BRA is published by Météo-France in the early afternoon, valid for the following day, daily from mid-December to the end of April, and it covers the Alps, the Pyrénées and Corsica — one bulletin per massif. You'll find it free on Météo-France's mountain-weather pages (meteofrance.com/meteo-montagne), in the Météo-France mobile app, and posted on the display boards at ski areas and mountain refuges; the raw data is also released publicly as XML and PDF. The rhythm is the whole point: because it's issued the afternoon before, the moment to read it is the night before your tour, not at the trailhead — and an out-of-date BRA is worse than none, because the snowpack has already moved on.

*Why it's an estimation, and why that's not the same as a weather forecast. The full name — Bulletin d'estimation du Risque d'Avalanche — uses the word estimation* on purpose. A weather forecast predicts a physical quantity (temperature, snowfall) at a point in time; the BRA is a forecaster's expert judgement of avalanche danger across a whole massif, synthesised from weather models, the season's snowpack history, field observations and professional experience. Three consequences follow. It is regional, not point-specific. It is an estimate of likelihood and distribution, not a guarantee. And it describes the worst representative slope in the massif, so your particular slope may be less dangerous — but you never assume that without evidence. Treat the BRA as the best-informed starting hypothesis for the day, then confirm or downgrade it with what you actually see on the snow.

Where Snow Trace fits. Snow Trace surfaces and links the official Météo-France bulletin for your massif right next to the route on the map — it issues no avalanche forecast of its own and replaces neither the bulletin nor your training. The reading, and the judgement, stay yours.

03The avalanche danger scale: five levels that are not linear

Every European bulletin — French, Italian, Swiss, Spanish, Austrian — uses the same EAWS five-level danger scale. The words and colours are standardised so a skier crossing a border reads the same thing. Memorise these; they are the shared vocabulary of the whole continent.

Two things skiers consistently get wrong about this scale:

It is not linear — it is roughly logarithmic. The step from 2 to 3 is much bigger than the step from 1 to 2. Going from Moderate to Considerable does not mean "a bit more careful"; it means the probability of triggering a slab as a single skier has jumped sharply, and the terrain you can safely ski has shrunk hard. Treat each level-up as a major change in the day, not an increment.

Level 1 is not "safe." "Low" means the snowpack is generally stable, not that the consequences are. A small slide on Low can still carry you over a cliff or into a terrain trap. People die at every level of the scale, including 1 — and once a slab has you, the first 15 minutes decide survival. The scale rates the likelihood of a slab releasing — it does not rate your runout, your group spacing, or your luck.

Common mistake: treating the danger level as a green/red light. It isn't a permission slip. A level-3 day with the danger concentrated on north-east slopes above 2,400 m can be a fine day on sunny lower-angle terrain — and a deadly one if you ski the shaded steep bowl the bulletin warned about. The level sets the stakes; the rest of the bulletin tells you how to play them.

The instrument below shows the danger pyramid the way the bulletins draw it — and, crucially, how the terrain you can ski collapses as the level rises.

Going from Moderate to Considerable is not "a bit more careful": in a single step the danger front floods across the 30–33° band where most touring terrain lives, so the share of the mountain that's off-limits jumps by ~36 points — the largest bite on the whole scale, bigger than any other level-up. That is why level 3 is where most avalanche fatalities occur: it's the first level that engulfs a normal 30–34° touring slope while the day still feels manageable.

04Inside the BRA: the structure Météo-France actually uses

Open a BRA for any French massif (the Vanoise, the Écrins, the Mont-Blanc range, the Pyrénées…) and you'll find a consistent structure. Read it in this order — top to bottom is roughly most-urgent to most-detailed:

1. The massif and the date/validity. Each BRA covers one massif (Haute-Tarentaise, Oisans, Queyras, Haute-Maurienne, etc.), not a point. The danger it states is the worst representative slope in that massif — your specific slope may be lower, but never assume it's lower without reason. Check the validity window: a BRA is typically issued in the afternoon for the following day and expires; an old BRA is worse than useless because the snowpack moves.

2. The danger level — and whether it's split by elevation. Météo-France often gives two danger numbers, one above and one below a stated altitude (e.g. "3 above 2,200 m, 2 below"). The dividing altitude is a real decision line: it usually marks where the wind-loaded or persistent-weak-layer problem lives. Note it before anything else.

3. The avalanche problems (the "situation avalancheuse type"). This is the heart of the bulletin and the part most skiers skip. The BRA names the active avalanche problem(s) — wind slab, persistent weak layer, wet snow, new snow, gliding snow — usually with the EAWS pictograms. Each problem has a different where, when, and how to manage. We break the five problems down in the next section; for now, know that the problem is more actionable than the number. "Level 3, persistent weak layer on N–E aspects above 2,400 m" tells you exactly what to avoid; "Level 3" alone tells you nothing useful.

4. The aspect/elevation rose (la rose des pentes / des expositions). A compass rose, often stacked into elevation bands, with the dangerous aspect+elevation sectors shaded. This is the single most useful graphic in the bulletin: it converts the prose into a picture of exactly which slopes to stay off. If the NE–E–SE sectors above treeline are shaded, your plan should route around lee, shaded, high slopes. Read the rose, then look at your route's aspects and elevations and see where they overlap with the shading. (For why aspect and elevation drive snow conditions in the first place, see Aspect & Elevation: How They Shape Snow.)

5. The natural-vs-triggered distinction. The BRA separates "déclenchements provoqués" (triggered — by a skier's weight, the everyday ski-touring concern) from "départs spontanés" (natural/spontaneous — releasing on their own, typically from new-snow loading, wind, or daytime warming). For a ski tourer the triggered probability usually governs your slope choice; the natural probability governs your exposure to overhead hazard (couloirs above the skin track, slopes you traverse beneath). Both matter; they answer different questions.

6. The snowpack description (l'état du manteau neigeux). The forecaster's narrative of why the danger is what it is — the buried layers, the recent wind and precipitation, the crust history. This is where you learn whether today's danger is a short-lived new-snow problem (clears in a day or two) or a persistent-weak-layer problem (lingers for weeks and is far less forgiving). Same number, completely different risk tolerance.

7. The weather (météo des neiges) and the trend. Snow weather for the period plus, often, a danger trend (rising, steady, falling). A rising trend means you're racing a deteriorating snowpack; a falling trend after a storm means waiting a day can transform the day.

Decode key: the BRA is published only in French. Opening the real document in another language, these are the field labels you'll meet most often:

Read the rose against your route. Before you commit, hold the aspect/elevation rose next to your planned tour. List your route's aspects and the elevations where it's steep (>30°). If any steep section sits in a shaded sector of the rose, that's your crux — re-route, change the timing, or change the objective. On Snow Trace every route lists aspect and elevation, and the official regional bulletin is one tap from the route on the map, so you can do this overlay without leaving the plan.

05The five avalanche problems (situation avalancheuse type): the BRA’s most useful line

EAWS defines five standard avalanche problems, and every modern bulletin (BRA included) names the ones in play. Each is a different beast with a different signature in space and time. This is the line you should read most carefully, because it tells you how to move far more precisely than the danger number does. (For a deeper field guide to each one, see The Five Avalanche Problem Types.)

1. New-snow problem (neige récente). Fresh storm snow overloading the slope, or bonding poorly to the old surface — and how much a storm actually loaded the slope depends on the snow's density, not just how deep it fell. Worst during and just after the storm, on all aspects but especially where it accumulates deep. Management: wait. New-snow instability typically settles in 24–48 hours; give it time and drop your slope angle in the meantime.

2. Wind-slab problem (plaques à vent / neige soufflée). Wind transports snow and deposits dense, cohesive slabs on lee (downwind) slopes — classically the NE–E–SE quadrant after the prevailing W/NW winds, and just below ridgelines and behind terrain features. The tell on the ground: smooth, pillowy, drum-like or chalky snow where the wind dumped it, with scoured, hard snow on the windward side metres away. Management: identify the lee aspects from the bulletin and the wind history, and avoid the loaded pockets — they are localised but reactive.

3. Persistent-weak-layer problem (couche fragile persistante / sous-couche fragile). The killer. A buried layer of faceted grains, depth hoar, or surface hoar that stays weak for weeks, deep in the pack where you can't see or easily test it. It produces low-probability / high-consequence slabs that can release remotely, propagate wide, and break above you. It defeats the usual "ski it carefully and watch for signs" approach because the warning signs are buried. Management: when the BRA names a persistent weak layer, drop your risk tolerance hard — avoid the loaded steep aspects entirely; don't rely on tracks or "it held for others." This is why a level-3 day with a persistent weak layer is far more serious than a level-3 day with only a settling new-snow problem. (See Understanding Snowpack Stability.)

4. Wet-snow problem (neige humide / neige mouillée). Meltwater from sun or rain robs the snow of strength → wet-loose point releases and wet slabs. This is a time-of-day problem: a slope that's safe frozen at dawn can be dangerous by early afternoon. Management: get on and off sun-exposed slopes early, set a hard turnaround time, and watch for the surface going from supportive to slush (see Spring Corn & the Melt-Freeze Cycle).

5. Gliding-snow problem (neige glissante / avalanches de glissement). The whole snowpack creeps over warm or smooth ground and can release as a glide avalanche, opening tell-tale "glide cracks" (full-depth mouths) in the slope. Release timing is effectively unpredictable — minutes or days after a crack appears. Management: avoidance only — never linger below or beside an open glide crack, at any danger level.

Common mistake: managing the wrong problem. Wind slab and a persistent weak layer demand different behaviour. You can ski around a localised wind slab by reading the terrain and avoiding loaded pockets; you cannot "ski around" a persistent weak layer by being attentive, because the weakness is buried, widespread, and capable of propagating across terrain features. Read which problem the BRA names — then manage that one.

The interactive rose below maps each of these problems onto the aspect, elevation band and time-of-day where it lives — the same three axes the BRA's rose and text encode. Step through the problems and watch where the danger concentrates move around the mountain.

The danger number tells you the stakes; the avalanche problem tells you where and when. Wind slab hides on lee slopes below ridges, the persistent weak layer lurks on cold shaded aspects, and wet snow is a time-of-day problem on sunny faces — three different problems demanding three different plans, all under the same rating.

06Reading the BRA the night before: a worked example

Theory is cheap. Here is how to actually run a BRA into a go/no-go, using a realistic mid-winter bulletin for an alpine massif:

Massif: Haute-Maurienne. Valid tomorrow. Danger: 3 (Marqué) above 2,200 m, 2 (Limité) below. Problems: persistent weak layer (sous-couche fragile) on N, NE, E above 2,400 m; localised wind slab on E–SE below ridgelines. Triggered: likely by a single skier on the named steep aspects. Natural: isolated, mainly during the warmest hours on steep sunny slopes. Snowpack: a layer of faceted grains buried ~50–80 cm down on shaded aspects, formed during the cold clear spell two weeks ago; recent NW wind has built fresh slabs on lee slopes. Trend: steady.

Read it in order and turn it into decisions:

1. Elevation split → set a ceiling. The serious danger is above 2,200 m, and the persistent weak layer above 2,400 m. A tour kept mostly below 2,200 m on moderate terrain is a fundamentally different (level-2) day. Decision: either stay low, or accept a level-3 day and plan for it.
2. The problem is persistent, not new → margins go up, not down. This is the line that changes everything. A buried faceted layer at 50–80 cm releasing as a triggered slab is high-consequence and hard to detect. Decision: avoid steep (>30°) N/NE/E slopes above 2,400 m entirely. Do not "ski it carefully." Do not trust existing tracks.
3. The rose → pick safe aspects. The shaded sectors are the cold N–E quadrant up high (persistent layer) plus E–SE lee pockets (wind slab). The unshaded terrain — sunny S/SW slopes, lower angles, ridges and broad faces away from lee loading — is where your route should live. Decision: route via south-ish, lower-angle, non-lee terrain.
4. Natural vs triggered → manage overhead and timing. Triggered danger governs your slope choice (done above). The natural note ("warmest hours, steep sunny slopes") is a timing flag for the very aspects you're now using. Decision: be off the sunny steep terrain before the afternoon warm-up; set a turnaround time.
5. Trend steady → no free pass from waiting. A falling trend might let you wait a day for the wind slab to stabilise — but a persistent weak layer doesn't clear on that timescale, and the trend is steady anyway. Decision: the plan is the plan; don't expect tomorrow to be safer.

The output isn't "go" or "no-go" — it's a shaped day: a south-leaning, sub-2,400 m or low-angle route, off the cold steep aspects, finished before the afternoon. That is what reading the whole bulletin buys you that the number alone never could.

Planning a tour? On Snow Trace, open your route, read the official regional bulletin one tap away on the map, and check each section's aspect and elevation against the rose — then pick the faces and the timing that keep you out of the shaded sectors. It's free; log in with Strava.

07Reading AINEVA, SLF & AEMET: same EAWS, different documents

Cross a border and the danger scale is identical, but the document changes. Because all of them implement the EAWS standard, once you can read the BRA you can read any of them — you're just relearning the layout, not the language. Here's what changes, country by country.

Italy — AINEVA (and the regional services). Italy's avalanche bulletins are coordinated by AINEVA, with the actual forecasts issued by the regional/provincial services (ARPA Piemonte, ARPA Veneto, the Aosta Valley, the autonomous provinces of Trento and Bolzano/Südtirol, etc.). Expect the same EAWS five-level scale, the same avalanche-problem pictograms, and a bollettino ("bollettino valanghe") structured around grado di pericolo (danger level), problemi tipici (typical problems) and the aspect/elevation rose. Dolomite/Südtirol bulletins are often published in both Italian and German, reflecting the bilingual region — handy, and a reminder you're reading a shared European product. The key vocabulary: pericolo = danger, neve ventata = wind slab, strato debole persistente = persistent weak layer, neve bagnata = wet snow.

Switzerland — SLF. The WSL Institute for Snow and Avalanche Research SLF in Davos issues the national Swiss bulletin, widely regarded as one of the best-resourced in the world (it's published in German, French, Italian and English, so you can read it in English directly). The SLF bulletin and its White Risk platform lean heavily on the avalanche-problem framework and an interactive map; the danger description, the aspect/elevation rose ("Gefahrenstellen" — danger spots) and the snowpack narrative all map cleanly onto the BRA's sections. If you only ever learn one foreign bulletin's layout, SLF's English edition is the gentlest on-ramp.

Spain — AEMET (and regional services). In the Spanish Pyrenees the national meteorological agency AEMET issues the avalanche-danger bulletin ("predicción de aludes"/"peligro de aludes"), with regional coverage also from Catalan and Aragonese services in their areas. Same EAWS scale (peligro 1–5), same problems (placa de viento = wind slab, capa débil persistente = persistent weak layer, nieve húmeda = wet snow), and a per-zone structure. Coverage is typically focused on the Pyrenean massifs; for the Sierra Nevada and other ranges, check the relevant regional source and expect a sparser bulletin than in the Alps.

Austria — the Lawinenwarndienste and the Euregio bulletin. Each Austrian Land runs its own avalanche-warning service, and Tyrol, South Tyrol and Trentino publish a shared, trilingual Euregio bulletin (German, Italian and English) that many tourers on both sides of the Brenner rely on. Same EAWS scale and problems; the trilingual edition makes it another easy English read alongside SLF.

Three rules that travel with you across all of them:

1. The scale is the constant. A "3" means the same thing in the Vanoise, the Dolomites, the Valais and the Pyrenees. The colours and level names are EAWS-standard everywhere.
2. The problem framework is the constant. Wind slab, persistent weak layer, wet snow, new snow, gliding snow — the same five, with the same pictograms, in every country. Learn them once.
3. The layout and language are the variables. Where the rose sits, how the elevation bands are drawn, whether the bulletin is point-, massif- or region-based, and which language it's in — that is what you relearn at each border. It's a layout change, not a concept change.

So the workflow is always the same: find the right bulletin for your massif and day → read the danger and its elevation split → read the named problems → read the aspect/elevation rose → check natural vs triggered → read the snowpack narrative and trend → overlay it on your route's aspects and elevations. Country changes; method doesn't.

08From bulletin to plan: making it a habit

The bulletin only protects you if reading it is a routine, done the same way every time, the night before — not a glance at the trailhead. Build the habit:

The night before.

1. Pull the current bulletin for your exact massif (check the validity date).
2. Read the danger level and its elevation split — set a ceiling if there is one.
3. Read the named avalanche problem(s) — this decides how aggressive you can be. A persistent weak layer means big margins; a settling new-snow problem means patience; wet snow means an early start.
4. Read the aspect/elevation rose and list your route's steep aspects and elevations against it. Any overlap is your crux.
5. Note the natural-vs-triggered split — triggered for your slope choice, natural for overhead hazard and timing.
6. Read the snowpack narrative and trend — is this danger short-lived or persistent, rising or falling?
7. Decide a shaped plan: aspects to ski, aspects to avoid, a turnaround time, and a plan B.

In the field, verify it. The bulletin is a regional estimate; you're standing on a specific slope. Watch for the obvious danger signs the bulletin can't localise: recent avalanches, shooting cracks, "whumpfs" (collapsing), hollow drum-like snow, new wind-loading, rapid warming — the signals you use to assess snowpack stability yourself. If what you see contradicts the bulletin, trust the slope, not the paper — and dial it back.

Where Snow Trace fits. Use it to do the overlay: every route lists aspect and elevation, the official regional bulletin is one tap from the route on the map, and you can plan timing with the Munter method and check live snow depth and webcams for context. Snow Trace surfaces the official bulletin and the route data; it does not forecast avalanche danger or replace the bulletin or your training. The judgement is yours, made with the official forecast and your own eyes.

Read it every time. The most dangerous bulletin is the one you didn't open — or the one you opened, saw "3," and closed. Read the whole thing, the night before, every time. It's the cheapest piece of safety equipment you own.

*This article is educational and does not replace formal avalanche training, the official avalanche bulletin, or your own judgement in the field. Get trained, read the current bulletin for your massif, carry transceiver-probe-shovel and know how to use them, and turn around when the snow tells you to.*

09Sources & further reading

Sources & further reading. This article reflects the published frameworks of the national avalanche services and the European standard they share. Always defer to the current official bulletin for your massif and to hands-on training:

• **Météo-France — avalanches / BRA** — the French Bulletin d'estimation du Risque d'Avalanche, per massif
• **EAWS** — European Avalanche Warning Services: the shared danger scale and avalanche-problem definitions
• **SLF** — WSL Institute for Snow and Avalanche Research, Davos (Swiss bulletin + White Risk; EN edition)
• **AINEVA** — Italian inter-regional avalanche coordination
• **AEMET** — Spanish national meteorological agency (Pyrenean avalanche danger)
• McClung & Schaerer, "The Avalanche Handbook" — the standard technical reference