Haute-Ariege
Considerable Bulletin date: Saturday, April 25, 2026 at 03:00 PM
Valid until:
Ski resorts in this massif: Plateau de Beille
This is an AI-generated translation and summary. It may contain errors. Always read the full official Météo-France avalanche bulletin before any mountain activity.
Source: Météo-France
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Avalanche risk assessment bulletin
(valid outside of marked and open slopes)
REGION : Haute-Ariege
written on Saturday 25 April 2026 at 15:00.
Risk assessment for Sunday, 26 April 2026
Continued wetting, very large full depth slab avalanches possible.
Risk indices: 5 very high - 4 high - 3 considerable - 2 moderate - 1 low -- In black: the most dangerous slopes
Moderate risk level increasing to considerable.
Naturally triggered avalanche: Surface avalanches and full depth slab avalanches in wet snow
Skier-triggered release: Point releases in wet snow triggered by the passage of a hiker
Stability of the snow cover until Sunday, 26 April evening
Typical avalanche situation:
Full depth slab avalanche
Wet snow
Naturally triggered avalanche : - At altitude, with the dampening reaching deeper, full depth slab avalanches carrying away the entire snow cover are possible on all aspects (fissures/drifting snow and full depth slab avalanches reported in recent days). They will be medium to large in size, or even more rarely very large in the areas of greatest snow dunes (north to south-east slopes). Fracture lines can indeed locally exceed 1 to 2m in snow thickness. These avalanches can then travel significant vertical distances and reach trails at altitudes below the snow line in the usual avalanche paths. The flow will be more or less rapid depending on the slope, with sometimes dense blocks of various sizes. They can also involve rockfalls. - With a snow cover that is fully wet, with little surface refreezing, point-release wet snow avalanches of small to medium size are already expected from the morning and become more numerous with daytime changes. These two types of wet snow avalanches can also be initiated by the collapse of a summit cornice or following a shower weighing down the snow cover. Furthermore, the presence of a more or less old avalanche deposit is not necessarily a guarantee of safety if the slope above is not fully cleared. . Skier-triggered release : - A skier cutting a steep slope that is already quite wet may encourage a point-release of small to more rarely medium size. These sluffs can sweep away skis and cause a fall. High-altitude slopes facing East in the morning then West at the end of the day (passing through South) are most exposed to this risk. Other: Still-imposing cornices are in place and are likely to give way spontaneously with the dampening, as are snow bridges over streams well-supplied by the current melt.
Snow quality
Snow conditions :
Snow conditions in our regions remain good for the season, still far higher than in recent winters. With the ambient mildness, the snow cover loses about ten cm per day below 2300/2400 m, and the skiable limit is gradually rising, in particular in the south (where quantities are less significant). It is still at its best around 1600/1700 m in the north and 1900 to 2000 m in the south, locally higher in areas with less snow this winter. Then, a good snow thickness is quickly found which still often exceeds 1m at 2000 m in the north, and 2m at 2500m.
Snow quality :
In the early morning, only slopes located above 2400/2500m should experience surface refreezing thanks to the clear spells at night. Elsewhere, refreezing is much more hit-or-miss and very often non-existent. Dampening resumes quickly in the morning and continues in the afternoon, moreover with new showers forecast.
The surface of the snow cover generally consists of ochre snow, laden with Saharan dust which helps to speed up the melt. In the afternoon, the snow is heavy everywhere, often not supporting the weight of pedestrians. West to north-west passes and ridges are generally less snow-covered, with rocks appearing more and more at the surface.
Weather overview for Sunday, 26 April
| night | morning | afternoon | evening | |
|---|---|---|---|---|
 |  |  |  | |
| Sea of clouds in the morning, thundery showers in the afternoon. | ||||
| Rain-Snow | - | 2700m | 2900m | 2800m |
| Iso 0°C | 3300 m | 3200 m | 3200 m | 3300 m |
| Wind 2000 m | 5 km/h | 5 km/h | 10 km/h | 5 km/h |
| Wind 3000 m | 10 km/h | 10 km/h | 15 km/h | 10 km/h |
Off-piste snow depth
Precipitation at 1800 m
Outlook for Monday, 27 April
Risk index moderate
Rather decreasing.
Snow-weather conditions for the last 7 days
Last 7 days
| Sun. 19/04 | Mon. 20/04 | Tue. 21/04 | Wed. 22/04 | Thu. 23/04 | Fri. 24/04 | Sat. 25/04 | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | |
| Weather |  |  |  |  |  | |  |  |  |  |  |  | | |  |  |  |  | |  | |  | |  | |  | |  |
| Wind (km/h) at 3000m | 20 | 15 | 25 | 25 | 25 | 20 | 30 | 20 | 25 | 25 | 40 | 35 | 40 | 25 | 25 | 25 | 25 | 15 | 20 | 15 | 25 | 20 | 15 | 15 | 15 | 15 | 15 | 10 |
| Wind (km/h) at 2000m | 15 | 10 | 15 | 20 | 20 | 10 | 20 | 15 | 15 | 15 | 25 | 35 | 40 | 20 | 20 | 15 | 15 | 15 | 15 | 15 | 20 | 15 | 10 | 10 | 10 | 10 | 10 | 5 |
Iso 0°CRain-snow limit | ||||||||||||||||||||||||||||
Altitude (m) 3200 2400 1600 800 0 | ||||||||||||||||||||||||||||
| Sun. 19/04 | Mon. 20/04 | Tue. 21/04 | Wed. 22/04 | Thu. 23/04 | Fri. 24/04 | Sat. 25/04 | ||||||||||||||||||||||
Fresh snow (6h) | 0 cm | |||||||||||||||||||||||||||
| Avalanche Risk | ||||||||||||||||||||||||||||
Snow cover North and South at 1500m··· 2000m- - - 2500m | ||||||||||||||||||||||||||||
Total snow depth (cm) 320 240 160 80 0 | ||||||||||||||||||||||||||||
| Sun. 19/04 | Mon. 20/04 | Tue. 21/04 | Wed. 22/04 | Thu. 23/04 | Fri. 24/04 | Sat. 25/04 | ||||||||||||||||||||||
Snow limit - North face Snow limit - South face | ||||||||||||||||||||||||||||
Snow limit (m) 2400 2100 1800 1500 1200 900 600 300 0 | ||||||||||||||||||||||||||||
| Sun. 19/04 | Mon. 20/04 | Tue. 21/04 | Wed. 22/04 | Thu. 23/04 | Fri. 24/04 | Sat. 25/04 | ||||||||||||||||||||||
| Iso 0°C | RSL | Weather at 1800m |
Wind at 2000m |
Wind at 3000m |
||
|---|---|---|---|---|---|---|
| Sun. 19/04 | 03h | 3 200 | - | | 15 | 20 |
| 09h | 3 100 | - | | 10 | 15 | |
| 15h | 3 100 | 2 700 | | 15 | 25 | |
| 21h | 3 200 | - | | 20 | 25 | |
| Mon. 20/04 | 03h | 3 100 | - | | 20 | 25 |
| 09h | 3 100 | - | | 10 | 20 | |
| 15h | 3 100 | 2 700 | | 20 | 30 | |
| 21h | 3 200 | 2 700 | | 15 | 20 | |
| Tue. 21/04 | 03h | 3 100 | 2 700 | | 15 | 25 |
| 09h | 3 300 | - | | 15 | 25 | |
| 15h | 3 400 | 3 000 | | 25 | 40 | |
| 21h | 3 500 | - | | 35 | 35 | |
| Wed. 22/04 | 03h | 3 500 | - | | 40 | 40 |
| 09h | 3 300 | - | | 20 | 25 | |
| 15h | 3 300 | 2 900 | | 20 | 25 | |
| 21h | 3 300 | - | | 15 | 25 | |
| Thu. 23/04 | 03h | 3 200 | - | | 15 | 25 |
| 09h | 3 200 | - | | 15 | 15 | |
| 15h | 3 200 | 2 800 | | 15 | 20 | |
| 21h | 3 300 | - | | 15 | 15 | |
| Fri. 24/04 | 03h | 3 300 | - | | 20 | 25 |
| 09h | 3 200 | - | | 15 | 20 | |
| 15h | 3 200 | 2 900 | | 10 | 15 | |
| 21h | 3 200 | - | | 10 | 15 | |
| Sat. 25/04 | 03h | 3 300 | - | | 10 | 15 |
| 09h | 3 200 | - | | 10 | 15 | |
| 15h | 3 200 | 2 900 | | 10 | 15 | |
| 21h | 3 200 | 2 800 | | 5 | 10 | |
| Avalanche risk |
Snow limit | Snow depth at 2000m |
Fresh snow at 1800m |
|||
| Sun. 19/04 | N : 1 600 m S : 1 800 m | N : 170 cm S : 65 cm | 0 cm | |||
| Mon. 20/04 | N : 1 600 m S : 1 800 m | N : 160 cm S : 50 cm | 0 cm | |||
| Tue. 21/04 | N : 1 600 m S : 1 800 m | N : 160 cm S : 50 cm | 0 cm | |||
| Wed. 22/04 | N : 1 700 m S : 1 900 m | N : 150 cm S : 50 cm | 0 cm | |||
| Thu. 23/04 | N : 1 700 m S : 1 900 m | N : 140 cm S : 40 cm | 0 cm | |||
| Fri. 24/04 | N : 1 700 m S : 1 900 m | N : 130 cm S : 30 cm | 0 cm | |||
| Sat. 25/04 | N : 1 700 m S : 1 900 m | N : 120 cm S : 20 cm | ||||
| French | Translation & Notes |
|---|---|
| Poursuite de l'humidification, très grandes avalanches de fond possibles. | Continued wetting, very large full-depth avalanches possible. *Poursuite* means continuation. *Humidification* refers to the process of liquid water infiltrating the snowpack (wetting/thawing). *Avalanches de fond* are full-depth avalanches, often used interchangeably with glide-snow avalanches in this context. |
| Départs spontanés : | Spontaneous releases: *Spontanés* means natural releases occurring without human triggers. |
| En altitude, avec l'humidification qui gagne en profondeur, des avalanches de fond emportant l'ensemble du manteau neigeux sont possibles en toutes orientations ( fissures/reptations et avalanches de fond signalées ces derniers jours). | At high altitude, as the wetting gains depth, full-depth avalanches taking out the entire snowpack are possible on all aspects (cracks/gliding and full-depth avalanches reported in recent days). *Gagne en profondeur* implies the water is moving deeper into the layers. *L'ensemble du manteau neigeux* means the total snowpack down to the ground. *Reptations* refers to 'glide' or 'creeping'—the slow downhill movement of the snow mass. |
| Elles seront de taille moyenne à grande, voire plus rarement très grandes dans les zones de plus fortes accumulations (pentes nord à sud-est). | They will be medium to large, or more rarely very large in areas of highest accumulation (north to southeast slopes). *Voire* means 'even' or 'indeed'. *Accumulations* refers to wind-loaded or naturally deep snow deposits. |
| Les cassures peuvent en effet localement dépasser les 1 à 2m d'épaisseur. | The crown faces can indeed locally exceed 1 to 2m in thickness. *Cassures* refers to the fracture line or crown face of an avalanche. |
| Ces avalanches peuvent alors parcourir des dénivelés importants et atteindre des sentiers à des altitudes inférieures à la limite d'enneigement dans les couloirs d'avalanche habituels. | These avalanches can then travel significant vertical distances and reach trails at altitudes below the snow line in habitual avalanche paths. *Dénivelés* is the vertical drop. *Limite d'enneigement* is the snow line (where snow meets bare ground). *Couloirs* are steep gullies. |
| L'écoulement sera plus ou moins rapide selon la pente, avec parfois des blocs denses de tailles variées. | The flow will be more or less fast depending on the slope, sometimes with dense blocks of various sizes. *Écoulement* means the flow of the avalanche. Wet snow avalanches often contain 'blocks' of consolidated snow. |
| Elles peuvent aussi entrainer avec elles des chutes de pierres. | They can also bring down rockfalls with them. *Entrainer* means to drag or carry along. As the snow slides on the ground, it often dislodges rocks. |
| Avec un manteau intégralement humidifié, regelant peu en surface, des départs ponctuels d'avalanches de neige humide, de taille petite à moyenne sont déjà attendus dès le matin et deviennent plus nombreux au cours de la journée. | With a snowpack wet throughout, with little surface refreeze, isolated wet snow point-release avalanches, small to medium in size, are already expected from the morning and will become more numerous during the day. *Regelant* comes from *regel* (refreeze). *Départs ponctuels* are point-release (loose snow) avalanches, as opposed to slab avalanches. |
| Ces deux types d'avalanches de neige humide peuvent aussi être initiés par la rupture d'une corniche sommitale ou suite à une averse alourdissant le manteau neigeux. | Both types of wet snow avalanches can also be initiated by the collapse of a summit cornice or following a shower making the snowpack heavier. *Rupture de corniche* is a cornice collapse. *Averse* usually refers to rain or snow showers; in this context of 'wetting', it likely implies rain or very wet snow. |
| D'autre part, la présence d'un dépôt d'avalanche plus ou moins ancien n'est pas forcément un gage de sécurité dans le cas d'une pente sus-jacente pas totalement purgée. | Furthermore, the presence of a more or less old avalanche deposit is not necessarily a guarantee of safety in the case of an overlying slope that has not been totally purged. *Gage de sécurité* means a guarantee/token of safety. *Sus-jacente* means the slope located above. |
| Déclenchements provoqués : | Triggered releases: *Provoqués* refers to human-triggered avalanches (skiers, hikers). |
| Un skieur coupant une pente raide déjà bien humidifiée pourra favoriser un départ ponctuel de taille petite à plus rarement moyenne. | A skier cutting a steep slope already well-saturated may promote a point-release of small to more rarely medium size. *Coupant* means cutting or traversing across. *Favoriser* (to favor/promote) in this context means 'to trigger'. |
| Ces coulées peuvent emporter les skis et provoquer la chute. | These slides can sweep away skis and cause a fall. *Coulées* is a common term for small avalanches or 'sluffs'. |
| Les pentes d'altitude orientées Est le matin puis Ouest en fin de journée (en passant par le Sud) sont les plus exposées à ce risque. | High altitude slopes facing East in the morning, then West at the end of the day (passing through South), are the most exposed to this risk. This describes the solar progression (the sun's path) warming different aspects throughout the day. |
| Autre : Des corniches encore imposantes sont en place et sont susceptibles de céder spontanément avec l'humidification, tout comme les ponts de neige sur les torrents bien alimentés par la fonte en cours. | Other: Large cornices are still in place and are likely to collapse spontaneously with the wetting, as are snow bridges over streams well-fed by the ongoing melt. *Imposantes* means large/massive. *Torrents* are mountain streams. *Fonte* is the melting process. |
| Mer de nuages le matin, des averses orageuses l'après-midi. | Sea of clouds in the morning, thundery showers in the afternoon. *Mer de nuages* is a common weather phenomenon where clouds sit low in the valleys. *Orageuses* means thundery/stormy. |
| Enneigement : L'enneigement dans nos massifs reste bon pour la saison, encore largement supérieur à celui des derniers hivers. | Snow coverage: Snow coverage in our massifs remains good for the season, still significantly higher than that of recent winters. *Enneigement* refers to the snow distribution/depth. *Largement supérieur* means much higher. |
| Avec la douceur ambiante, le manteau perd une dizaine de cm par jour en deçà de 2300/2400 m, et la limite skiable remonte progressivement, surtout en sud (où les quantités sont moins importantes). | With the mild ambient conditions, the snowpack is losing about ten cm per day below 2300/2400m, and the skiable limit is rising progressively, especially on south aspects (where quantities are lower). *Douceur* refers to mild/warm temperatures. *En deçà de* means below (a certain altitude). |
| Elle est encore au mieux vers 1600/1700 m en nord et 1900 à 2000 m en sud, localement plus haut dans des zones moins enneigées cet hiver. | It is still around 1600/1700m at best in the north and 1900 to 2000m in the south, locally higher in areas that were less snowy this winter. Describes the *limite skiable* (altitudes where you can still ski). |
| On trouve ensuite rapidement une bonne épaisseur de neige qui dépasse encore souvent les 1m à 2000 m en nord, et 2m à 2500m. | One then quickly finds a good snow depth which still often exceeds 1m at 2000m in the north, and 2m at 2500m. *Épaisseur* is thickness/depth. |
| Qualité de la neige : Au petit matin, seules les pentes situées au-dessus de 2400/2500m devraient connaitre un regel en surface à la faveur des éclaircies de la nuit. | Snow quality: In the early morning, only slopes located above 2400/2500m should experience a surface refreeze thanks to clear spells during the night. *Regel* is the crust formed by freezing. *Éclaircies* are breaks in the clouds/clear spells. |
| Ailleurs, le regel est beaucoup plus aléatoire et bien souvent inexistant. | Elsewhere, the refreeze is much more uncertain and very often non-existent. *Aléatoire* means random or hit-and-miss. |
| L’humidification reprend rapidement en matinée, et se poursuit l'après-midi, de surcroit avec de nouvelles averses prévues. | The wetting resumes quickly in the morning and continues in the afternoon, further worsened by new forecast showers. *De surcroit* means 'moreover' or 'additionally'. |
| La surface du manteau est généralement constituée de neige ocre, chargée en poussières sahariennes qui contribuent à accélérer la fonte. | The surface of the snowpack is generally made of ochre snow, laden with Saharan dust which contributes to accelerating the melt. *Ocre* (ochre) refers to the orange/brown tint Saharan sand gives the snow. This lowers the albedo and speeds up melting. |
| L'après-midi, la neige et partout lourde, souvent non portante pour les piétons. | In the afternoon, the snow is heavy everywhere, often non-supportive for pedestrians. *Non portante* means the snow doesn't support weight; you sink through it (often called 'post-holing'). |
| Les cols et crêtes ouest à nord-ouest sont généralement moins garnis en neige, les rochers affleurent de plus en plus en surface. | Passes and ridges from west to northwest are generally less covered in snow, with rocks increasingly breaking the surface. *Garnis* means furnished/covered. *Affleurent* means to 'crop out' or show through the surface. |
| French Term | English Term | Definition | Source |
|---|---|---|---|
| Départ spontané | Naturally triggered avalanche | Avalanche not caused by external forces, e.g. snowfall or loss in firmness due to weather conditions. | European Avalanche Warning Services |
| Avalanche de fond | Full depth slab avalanches | An avalanche which glides over the ground, across firn snow or atop a glacier in the fracture zone, sweeping the entire season’s snowpack with it. | European Avalanche Warning Services |
| déclenchable | Skier-triggered release | An avalanche caused by the weight of a person (skier, snowboarder, hiker) or by explosives. The additional load collapses a weak layer, causing the slab above to fracture and slide. | AvalancheClarity Static Glossary |
| Avalanche de neige mouillèe | Wet snow avalanches | Avalanche of wet snow masses. | European Avalanche Warning Services |
| Dépôt d‘avalanche | Avalanche deposit | Snow deposited by an avalanche. Such snow deposits frequently persist for longer periods on valley floors. | European Avalanche Warning Services |
| Au cours de la journée | Daytime changes | Evolving avalanche danger over the course of a day. Avalanche danger can vary greatly during the day. Springtime situations are typical: after a clear night, avalanche danger is low early in the morning, then increases over the course of the day due to daytime warming and solar radiation. Also common while heavy snowfall, prolonged wind activity and rain. | European Avalanche Warning Services |
| Enneigement | Snow conditions | The depth and distribution of snow on the ground across a mountain range. Varies with elevation, aspect, and snowfall history. | AvalancheClarity Static Glossary |
| Avalanche de plaque | Slab avalanches | The abrupt release of a slab of snow on a mountain slope. | European Avalanche Warning Services |
| Épaisseur de neige | Snow thickness | Thickness of the snowpack measured at right angle to slope. | European Avalanche Warning Services |
| Reptation | Drifting snow | Snow being lifted from the snow surface and transported by wind just above the snow surface (visibility not noticeably reduced). | European Avalanche Warning Services |
| Surtout | In particular | In general, avalanches can be triggered by high additional loading, in isolated cases by minimum additional loading. | European Avalanche Warning Services |
| marqué | considerable | Snowpack is moderately to poorly bonded on many steep slopes. Triggering is possible even from low additional loads, particularly on indicated steep slopes. In certain situations, some large natural avalanches are possible. | European Avalanche Warning Services |
| Pente raide | Steep slope | Slopes steeper than approximately 30°, where most slab avalanches occur. The steeper the slope, the lower the additional load needed to trigger a release. | AvalancheClarity Static Glossary |
| Regel | Refreezing | Overnight freezing of the snow surface forming a hard crust. Refreezing temporarily stabilises the snowpack but strength decreases with daytime warming. | AvalancheClarity Static Glossary |
| Manteau neigeux | Snow cover | Snow deposited on the ground in a multiplicity of layers. | European Avalanche Warning Services |
| Hauteur de neige | Snow depth | Thickness of the snowpack measured vertically. | European Avalanche Warning Services |
| Accumulations | Snow dunes | Snow deposits formed by wind-transported snow. Ripples are small transversal depositional features. Dunes are typically larger in scale and often Barchanoid. | European Avalanche Warning Services |
| Limite de l’enneigement | Snow line | Lower topographical limit of continuous snow cover, designated by altitude.Depending on slope aspect, the snow line can vary greatly. | European Avalanche Warning Services |
| Stabilité | Stability | The strength of a snowpack to withstand internal and external disturbances.Stability is determined by firmness vs. stress inside a snow layer. | European Avalanche Warning Services |
| très fort | very high | Snowpack is generally unstable. Many large natural avalanches are expected, even on moderately steep terrain. Extremely dangerous conditions — avoid all avalanche terrain. | European Avalanche Warning Services |
| Corniche | Cornices | An overhanging mass of snow created by wind, usually near a sharp terrain break such as a ridge. | European Avalanche Warning Services |
| Neige humide | Wet snow | The wet snow problem is related to the weakening of the snowpack due to the presence of liquid water. Water infiltrates the snowpack due to high radiation impact (sunshine) which leads to melt or rain (advecting energy into the snowpack leading to melt as well). | European Avalanche Warning Services |
| limité | moderate | Snowpack is moderately well bonded on some steep slopes, otherwise generally well bonded. Triggering is possible with high additional loads, particularly on indicated steep slopes. Large natural avalanches unlikely. | European Avalanche Warning Services |
| Exposé | Exposed | Exposure to wind, sun, avalanches or other general danger. | European Avalanche Warning Services |
| Exposition | Aspects | Direction in which a slope faces as indicated by compass direction of the fall line; i.e. a north slope faces in a northerly direction. | European Avalanche Warning Services |
| Massifs | Regions | Areas comprising several valleys.In avalanche bulletins, regions are generally subdivided climatically or geographically. | European Avalanche Warning Services |
| Probable | Likely | Event with a probability of occurrence exceeding 50%. | European Avalanche Warning Services |
| moyen | medium | IACS/UNESCO | |
| Arête | Ridges | Narrow crest line of a mountain. | European Avalanche Warning Services |
| Coulée | Sluffs | A small downhill movement of snow. | American Meteorological Society |
| Risque | Risk | Likelihood of occurrence combines mathematical probability, risk exposure and possible damages. | European Avalanche Warning Services |
| faible | low | Snowpack is generally well bonded and stable. Triggering is generally possible only from high additional loads in a few isolated steep extreme terrain features. Only small natural avalanches possible. | European Avalanche Warning Services |
Bulletin d'estimation du risque d'avalanche
(valable en dehors des pistes balisées et ouvertes)
MASSIF : Haute-Ariege
rédigé le samedi 25 avril 2026 à 15 h.
Estimation des risques pour le dimanche 26 avril 2026
Poursuite de l'humidification, très grandes avalanches de fond possibles.
Indices de risque : 5 très fort - 4 fort - 3 marqué - 2 limité - 1 faible -- En noir : les pentes les plus dangereuses
Indice de risque limité évoluant en marqué.
Départs spontanés : Avalanches de surface et avalanches de fond en neige humide
Déclenchements skieurs : Départs ponctuels en neige humide favorisés par le passage d'un randonneur
Stabilité du manteau neigeux jusqu'au dimanche 26 avril au soir
Situation avalancheuse typique :Avalanches de fondNeige humide
Départs spontanés : - En altitude, avec l'humidification qui gagne en profondeur, des avalanches de fond emportant l'ensemble du manteau neigeux sont possibles en toutes orientations ( fissures/reptations et avalanches de fond signalées ces derniers jours). Elles seront de taille moyenne à grande, voire plus rarement très grandes dans les zones de plus fortes accumulations (pentes nord à sud-est). Les cassures peuvent en effet localement dépasser les 1 à 2m d'épaisseur. Ces avalanches peuvent alors parcourir des dénivelés importants et atteindre des sentiers à des altitudes inférieures à la limite d'enneigement dans les couloirs d'avalanche habituels. L'écoulement sera plus ou moins rapide selon la pente, avec parfois des blocs denses de tailles variées. Elles peuvent aussi entrainer avec elles des chutes de pierres. - Avec un manteau intégralement humidifié, regelant peu en surface, des départs ponctuels d'avalanches de neige humide, de taille petite à moyenne sont déjà attendus dès le matin et deviennent plus nombreux au cours de la journée. Ces deux types d'avalanches de neige humide peuvent aussi être initiés par la rupture d'une corniche sommitale ou suite à une averse alourdissant le manteau neigeux. D'autre part, la présence d'un dépôt d'avalanche plus ou moins ancien n'est pas forcément un gage de sécurité dans le cas d'une pente sus-jacente pas totalement purgée. . Déclenchements provoqués : - Un skieur coupant une pente raide déjà bien humidifiée pourra favoriser un départ ponctuel de taille petite à plus rarement moyenne. Ces coulées peuvent emporter les skis et provoquer la chute. Les pentes d'altitude orientées Est le matin puis Ouest en fin de journée (en passant par le Sud) sont les plus exposées à ce risque. Autre : Des corniches encore imposantes sont en place et sont susceptibles de céder spontanément avec l'humidification, tout comme les ponts de neige sur les torrents bien alimentés par la fonte en cours.
Qualité de la neige
Enneigement :
L'enneigement dans nos massifs reste bon pour la saison, encore largement supérieur à celui des derniers hivers. Avec la douceur ambiante, le manteau perd une dizaine de cm par jour en deçà de 2300/2400 m, et la limite skiable remonte progressivement, surtout en sud (où les quantités sont moins importantes). Elle est encore au mieux vers 1600/1700 m en nord et 1900 à 2000 m en sud, localement plus haut dans des zones moins enneigées cet hiver. On trouve ensuite rapidement une bonne épaisseur de neige qui dépasse encore souvent les 1m à 2000 m en nord, et 2m à 2500m.
Qualité de la neige :
Au petit matin, seules les pentes situées au-dessus de 2400/2500m devraient connaitre un regel en surface à la faveur des éclaircies de la nuit. Ailleurs, le regel est beaucoup plus aléatoire et bien souvent inexistant. L’humidification reprend rapidement en matinée, et se poursuit l'après-midi, de surcroit avec de nouvelles averses prévues.
La surface du manteau est généralement constituée de neige ocre, chargée en poussières sahariennes qui contribuent à accélérer la fonte. L'après-midi, la neige et partout lourde, souvent non portante pour les piétons. Les cols et crêtes ouest à nord-ouest sont généralement moins garnis en neige, les rochers affleurent de plus en plus en surface.
Aperçu météo pour le dimanche 26 avril
| nuit | matin | après-midi | soir | |
|---|---|---|---|---|
| | | | |
| Mer de nuages le matin, des averses orageuses l'après-midi. | ||||
| Pluie-Neige | - | 2700m | 2900m | 2800m |
| Iso 0°C | 3300 m | 3200 m | 3200 m | 3300 m |
| Vent 2000 m | 5 km/h | 5 km/h | 10 km/h | 5 km/h |
| Vent 3000 m | 10 km/h | 10 km/h | 15 km/h | 10 km/h |
Epaisseur de neige hors-piste
Précipitations à 1800 m
Tendance du lundi 27 avril
Indice de risque limité
Plutôt en baisse.
Conditions nivo-météo des 7 derniers jours
Les 7 derniers jours
| dim. 19/04 | lun. 20/04 | mar. 21/04 | mer. 22/04 | jeu. 23/04 | ven. 24/04 | sam. 25/04 | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | 03h | 09h | 15h | 21h | |
| Météo | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Vent (km/h) à 3000m | 20 | 15 | 25 | 25 | 25 | 20 | 30 | 20 | 25 | 25 | 40 | 35 | 40 | 25 | 25 | 25 | 25 | 15 | 20 | 15 | 25 | 20 | 15 | 15 | 15 | 15 | 15 | 10 |
| Vent (km/h) à 2000m | 15 | 10 | 15 | 20 | 20 | 10 | 20 | 15 | 15 | 15 | 25 | 35 | 40 | 20 | 20 | 15 | 15 | 15 | 15 | 15 | 20 | 15 | 10 | 10 | 10 | 10 | 10 | 5 |
Iso 0°CLimite pluie-neige | ||||||||||||||||||||||||||||
Altitude en m 3200 2400 1600 800 0 | ||||||||||||||||||||||||||||
| dim. 19/04 | lun. 20/04 | mar. 21/04 | mer. 22/04 | jeu. 23/04 | ven. 24/04 | sam. 25/04 | ||||||||||||||||||||||
Neige fraîche (6h) | 0 cm | |||||||||||||||||||||||||||
| Risque d'Avalanche | ||||||||||||||||||||||||||||
Enneigement versant Nord et Sud à 1500m··· 2000m- - - 2500m | ||||||||||||||||||||||||||||
Hauteur totale de neige (cm) 320 240 160 80 0 | ||||||||||||||||||||||||||||
| dim. 19/04 | lun. 20/04 | mar. 21/04 | mer. 22/04 | jeu. 23/04 | ven. 24/04 | sam. 25/04 | ||||||||||||||||||||||
Limite de l'enneigement - Versant Nord Limite de l'enneigement - Versant Sud | ||||||||||||||||||||||||||||
Limite d'enneigement (m) 2400 2100 1800 1500 1200 900 600 300 0 | ||||||||||||||||||||||||||||
| dim. 19/04 | lun. 20/04 | mar. 21/04 | mer. 22/04 | jeu. 23/04 | ven. 24/04 | sam. 25/04 | ||||||||||||||||||||||
| Iso 0°C | LPN | Météo à 1800m |
Vent à 2000m |
Vent à 3000m |
||
|---|---|---|---|---|---|---|
| dim. 19/04 | 03h | 3 200 | - | | 15 | 20 |
| 09h | 3 100 | - | | 10 | 15 | |
| 15h | 3 100 | 2 700 | | 15 | 25 | |
| 21h | 3 200 | - | | 20 | 25 | |
| lun. 20/04 | 03h | 3 100 | - | | 20 | 25 |
| 09h | 3 100 | - | | 10 | 20 | |
| 15h | 3 100 | 2 700 | | 20 | 30 | |
| 21h | 3 200 | 2 700 | | 15 | 20 | |
| mar. 21/04 | 03h | 3 100 | 2 700 | | 15 | 25 |
| 09h | 3 300 | - | | 15 | 25 | |
| 15h | 3 400 | 3 000 | | 25 | 40 | |
| 21h | 3 500 | - | | 35 | 35 | |
| mer. 22/04 | 03h | 3 500 | - | | 40 | 40 |
| 09h | 3 300 | - | | 20 | 25 | |
| 15h | 3 300 | 2 900 | | 20 | 25 | |
| 21h | 3 300 | - | | 15 | 25 | |
| jeu. 23/04 | 03h | 3 200 | - | | 15 | 25 |
| 09h | 3 200 | - | | 15 | 15 | |
| 15h | 3 200 | 2 800 | | 15 | 20 | |
| 21h | 3 300 | - | | 15 | 15 | |
| ven. 24/04 | 03h | 3 300 | - | | 20 | 25 |
| 09h | 3 200 | - | | 15 | 20 | |
| 15h | 3 200 | 2 900 | | 10 | 15 | |
| 21h | 3 200 | - | | 10 | 15 | |
| sam. 25/04 | 03h | 3 300 | - | | 10 | 15 |
| 09h | 3 200 | - | | 10 | 15 | |
| 15h | 3 200 | 2 900 | | 10 | 15 | |
| 21h | 3 200 | 2 800 | | 5 | 10 | |
| Risque avalanche |
Limite enneigement | Enneigement à 2000m |
Neige fraîche à 1800m |
|||
| dim. 19/04 | N : 1 600 m S : 1 800 m | N : 170 cm S : 65 cm | 0 cm | |||
| lun. 20/04 | N : 1 600 m S : 1 800 m | N : 160 cm S : 50 cm | 0 cm | |||
| mar. 21/04 | N : 1 600 m S : 1 800 m | N : 160 cm S : 50 cm | 0 cm | |||
| mer. 22/04 | N : 1 700 m S : 1 900 m | N : 150 cm S : 50 cm | 0 cm | |||
| jeu. 23/04 | N : 1 700 m S : 1 900 m | N : 140 cm S : 40 cm | 0 cm | |||
| ven. 24/04 | N : 1 700 m S : 1 900 m | N : 130 cm S : 30 cm | 0 cm | |||
| sam. 25/04 | N : 1 700 m S : 1 900 m | N : 120 cm S : 20 cm | ||||