{"type": "Feature", "geometry": null, "properties": {"lang": "fr", "regions": [{"name": "Haute Maurienne", "regionID": "FR-11"}], "weather": {"wind": [{"speeds": [10, 10, 10, 5], "altitude": "2500m"}, {"speeds": [20, 20, 20, 25], "altitude": "3500m"}], "comment": "ff\u00e9es par plusieurs heures de soleil. Taille 1.\nurtout dans les versants SE, S, SO. Possibles \u00e0 toute heure, surtout l'apr\u00e8s-midi. Taille 2.\nAper\u00e7u m\u00e9t\u00e9o pour le mercredi 10 d\u00e9cembre\nreux nuit matin apr\u00e8s-midi soir", "isotherm0": [3200, 3100, 3000, 2900]}, "tendency": [{"comment": "

km/h 10 km/h 5 km/h

km/h 20 km/h 25 km/h

Tendance du jeudi 11 d\u00e9cembre

Indice de risque limit\u00e9

abilisation des plaques de surface.

", "dangerRating": "moderate", "tendencyType": "steady"}], "validTime": {"endTime": "2025-12-10T23:59:59+00:00", "startTime": "2025-12-09T15:00:00Z"}, "bulletinID": "FR-11-2025-12-10-20251209151129", "customData": {"MF": {"date": "2025-12-10", "massif": "HAUTE-MAURIENNE", "redigeAt": "2025-12-09T16:00:00", "triggered": "

les zones d'accumulation par les vents r\u00e9cents. Observables : changement de qualit\u00e9 de neige sur une courte distance, alternance \u00e9rosion/accumulation. Taille 1 \u00e0 2 (petite \u00e0

moyenne).

Facteur aggravant : une couche fragile persistante, irr\u00e9guli\u00e8rement r\u00e9partie, principalement est pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents. Possibilit\u00e9 d'une cassure

plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 3 (grande).

", "historical": {"wind": {"2500m": [10, 30, 25, 25, 25, 25, 20, 10, 10, 10, 10, 10, 20, 35, 40, 40, 40, 40, 40, 30, 20, 20, 10, 10, 10, 10, 10, 10], "3500m": [20, 35, 30, 30, 30, 30, 25, 20, 20, 20, 20, 20, 40, 55, 45, 50, 55, 70, 60, 50, 40, 40, 40, 30, 30, 30, 25, 25]}, "snowLine": {"north": [1100, null, null, 1100, null, 1100, null], "south": [null, 1100, null, 1100, null, 1100, null]}, "freshSnow": [5, 2, 0, 0, 0, 0, 0]}, "source_file": "BRA.HAUTE-MAURIENNE.2025-12-09.pdf", "spontaneous": "", "typicalAvalancheSituations": ["neige vent\u00e9e", "couche fragile persistante", "couche fragile"]}}, "highlights": "N Au-dessus de 2300m indice de risque limit\u00e9, plus bas indice faible.", "dangerRatings": [{"valid": true, "elevation": {"lowerBound": 2300, "upperBound": null}, "mainValue": "moderate"}, {"valid": true, "elevation": {"lowerBound": null, "upperBound": 2300}, "mainValue": "low"}], "publicationTime": "2025-12-09T15:11:29Z", "avalancheActivity": {"comment": "

les zones d'accumulation par les vents r\u00e9cents. Observables : changement de qualit\u00e9 de neige sur une courte distance, alternance \u00e9rosion/accumulation. Taille 1 \u00e0 2 (petite \u00e0

moyenne).

Facteur aggravant : une couche fragile persistante, irr\u00e9guli\u00e8rement r\u00e9partie, principalement est pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents. Possibilit\u00e9 d'une cassure

plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 3 (grande).

", "highlights": "N Au-dessus de 2300m indice de risque limit\u00e9, plus bas indice faible."}, "avalancheProblems": [{"order": 1, "aspects": ["N", "E", "SE", "S", "SW", "W"], "satLabel": "neige vent\u00e9e", "elevation": {}, "frequency": "many", "problemType": "wind_slab", "avalancheSize": "1"}, {"order": 2, "aspects": ["N", "E", "SE", "S", "SW", "W"], "satLabel": "couche fragile persistante", "elevation": {}, "frequency": "many", "problemType": "persistent_weak_layers", "avalancheSize": "1"}, {"order": 3, "aspects": ["N", "E", "SE", "S", "SW", "W"], "satLabel": "couche fragile", "elevation": {}, "frequency": "many", "problemType": "no_distinct_avalanche_problem", "avalancheSize": "1"}], "snowpackStructure": {"comment": "

Situation avalancheuse typique

neige vent\u00e9e couche fragile persistante

D\u00e9clenchements provoqu\u00e9s :

les zones d'accumulation par les vents r\u00e9cents. Observables : changement de qualit\u00e9 de neige sur une courte distance, alternance \u00e9rosion/accumulation. Taille 1 \u00e0 2 (petite \u00e0

moyenne).

Facteur aggravant : une couche fragile persistante, irr\u00e9guli\u00e8rement r\u00e9partie, principalement est pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents. Possibilit\u00e9 d'une cassure

plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 3 (grande).

D\u00e9parts spontan\u00e9s :

"}}}