{"type": "Feature", "geometry": null, "properties": {"lang": "fr", "regions": [{"name": "Maurienne", "regionID": "FR-09"}], "weather": {"wind": [{"speeds": [20, 30, 20, 20], "altitude": "2000m"}, {"speeds": [40, 50, 40, 40], "altitude": "3000m"}], "comment": "ff\u00e9es par plusieurs heures de soleil. Taille 1.\nm. Surtout dans les versants E, S, SW. Possibles \u00e0 toute heure, surtout l'apr\u00e8s-midi. Taille 2.\nAper\u00e7u m\u00e9t\u00e9o pour le mardi 09 d\u00e9cembre\nar la nuit matin apr\u00e8s-midi soir", "isotherm0": [3200, 3400, 3400, 3300]}, "tendency": [{"comment": "

km/h 20 km/h 20 km/h

km/h 40 km/h 40 km/h

Tendance du mercredi 10 d\u00e9cembre

Indice de risque limit\u00e9

oursuite du tassement, lente stabilisation

", "dangerRating": "moderate", "tendencyType": "steady"}], "validTime": {"endTime": "2025-12-09T23:59:59+00:00", "startTime": "2025-12-08T15:00:00Z"}, "bulletinID": "FR-09-2025-12-09-20251208150518", "customData": {"MF": {"date": "2025-12-09", "massif": "MAURIENNE", "redigeAt": "2025-12-08T16:00:00", "triggered": "

d'accumulation par les vents r\u00e9cents (de tendance S). 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 pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents et rarement ski\u00e9s. Possibilit\u00e9

d'une cassure plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 2.

", "historical": {"wind": {"2000m": [15, 10, 10, 25, 20, 15, 0, 0, 10, 5, 0, 5, 5, 5, 5, 5, 10, 25, 25, 20, 20, 15, 20, 10, 10, 5, 5, 10], "3000m": [20, 20, 20, 25, 15, 35, 30, 30, 25, 15, 10, 10, 15, 20, 20, 10, 35, 50, 45, 40, 50, 50, 50, 50, 60, 40, 30, 30]}, "snowLine": {"north": [1000, null, null, 1100, null, 1200, null], "south": [null, 1200, null, 1400, null, 1400, null]}, "freshSnow": [5, 3, 3, 1, 2, 0, 0]}, "source_file": "BRA.MAURIENNE.2025-12-08.pdf", "spontaneous": "", "typicalAvalancheSituations": ["neige vent\u00e9e", "couche fragile persistante", "couche fragile"]}}, "highlights": "N Au-dessus de 2400m indice de risque marqu\u00e9, plus bas indice limit\u00e9.", "dangerRatings": [{"valid": true, "elevation": {"lowerBound": 2400, "upperBound": null}, "mainValue": "considerable"}, {"valid": true, "elevation": {"lowerBound": null, "upperBound": 2400}, "mainValue": "moderate"}], "publicationTime": "2025-12-08T15:05:18Z", "avalancheActivity": {"comment": "

d'accumulation par les vents r\u00e9cents (de tendance S). 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 pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents et rarement ski\u00e9s. Possibilit\u00e9

d'une cassure plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 2.

", "highlights": "N Au-dessus de 2400m indice de risque marqu\u00e9, plus bas indice limit\u00e9."}, "avalancheProblems": [{"order": 1, "aspects": ["N", "E", "S"], "satLabel": "neige vent\u00e9e", "elevation": {}, "frequency": "some", "problemType": "wind_slab", "avalancheSize": "1"}, {"order": 2, "aspects": ["N", "E", "S"], "satLabel": "couche fragile persistante", "elevation": {}, "frequency": "some", "problemType": "persistent_weak_layers", "avalancheSize": "1"}, {"order": 3, "aspects": ["N", "E", "S"], "satLabel": "couche fragile", "elevation": {}, "frequency": "some", "problemType": "no_distinct_avalanche_problem", "avalancheSize": "1"}], "snowpackStructure": {"comment": "

Situation avalancheuse typique

neige vent\u00e9e couche fragile persistante

D\u00e9clenchements provoqu\u00e9s :

d'accumulation par les vents r\u00e9cents (de tendance S). 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 pr\u00e9sente en versants ombrag\u00e9s, prot\u00e9g\u00e9s des vents et rarement ski\u00e9s. Possibilit\u00e9

d'une cassure plus \u00e9paisse et assez large, \u00e0 fortiori en cas de d\u00e9clenchement en cascade. Taille 2.

D\u00e9parts spontan\u00e9s :

"}}}