{"type": "Feature", "geometry": null, "properties": {"lang": "fr", "regions": [{"name": "Mont Blanc", "regionID": "FR-03"}], "weather": {"wind": [{"speeds": [30, 30, 30, 35], "altitude": "2000m"}, {"speeds": [65, 65, 65, 70], "altitude": "4000m"}], "comment": "ou les dalles rocheuses. Taille 1 \u00e0 2 (petite \u00e0 moyenne).\ne 1 \u00e0 2 (petite \u00e0 moyenne)\nAper\u00e7u m\u00e9t\u00e9o pour le samedi 17 janvier\nnuit matin apr\u00e8s-midi soir\n.\ndes", "isotherm0": [2100, 2200, 2300, 2400]}, "tendency": [{"comment": "

km/h 30 km/h 35 km/h

km/h 65 km/h 70 km/h

Tendance du dimanche 18 janvier

Indice de risque marqu\u00e9

sque stationnaire. Le foehn faiblit en

urn\u00e9e de dimanche.

", "dangerRating": "considerable", "tendencyType": "steady"}], "validTime": {"endTime": "2026-01-17T23:59:59+00:00", "startTime": "2026-01-16T15:00:00Z"}, "bulletinID": "FR-03-2026-01-17-20260116145839", "customData": {"MF": {"date": "2026-01-17", "massif": "MONT-BLANC", "redigeAt": "2026-01-16T16:00:00", "triggered": "", "historical": {"wind": {"2000m": [35, 35, 35, 20, 20, 15, 10, 15, 25, 40, 40, 35, 35, 30, 30, 25, 20, 25, 30, 35, 30, 25, 20, 40, 40, 40, 40, 40], "4000m": [80, 75, 70, 80, 90, 90, 80, 70, 70, 70, 70, 55, 55, 50, 35, 45, 50, 55, 60, 60, 60, 45, 40, 60, 65, 80, 80, 80]}, "snowLine": {"north": [700, null, null, 700, null, 700, null], "south": [null, 900, null, 900, null, 900, null]}, "freshSnow": [25, 0, 0, 0, 0, 0, 0]}, "source_file": "BRA.MONT-BLANC.2026-01-16.pdf", "spontaneous": "

* En dessous de 2200/2400 m

rares avalanches de fond, dans les zones herbeuses ou les dalles rocheuses. Taille 1 \u00e0 2 (petite \u00e0 moyenne).

", "typicalAvalancheSituations": ["neige vent\u00e9e", "couche fragile persistante", "couche fragile"]}}, "highlights": "INSTABILIT\u00c9 MARQU\u00c9E EN UBACS.", "dangerRatings": [{"valid": true, "elevation": {"lowerBound": 2000, "upperBound": null}, "mainValue": "considerable"}, {"valid": true, "elevation": {"lowerBound": null, "upperBound": 2000}, "mainValue": "moderate"}], "publicationTime": "2026-01-16T14:58:39Z", "avalancheActivity": {"comment": "

* En dessous de 2200/2400 m

rares avalanches de fond, dans les zones herbeuses ou les dalles rocheuses. Taille 1 \u00e0 2 (petite \u00e0 moyenne).

", "highlights": "INSTABILIT\u00c9 MARQU\u00c9E EN UBACS."}, "avalancheProblems": [{"order": 1, "aspects": ["N", "NE", "NW"], "satLabel": "neige vent\u00e9e", "elevation": {}, "frequency": "few", "problemType": "wind_slab", "avalancheSize": "2"}, {"order": 2, "aspects": ["N", "NE", "NW"], "satLabel": "couche fragile persistante", "elevation": {}, "frequency": "few", "problemType": "persistent_weak_layers", "avalancheSize": "2"}, {"order": 3, "aspects": ["N", "NE", "NW"], "satLabel": "couche fragile", "elevation": {}, "frequency": "few", "problemType": "no_distinct_avalanche_problem", "avalancheSize": "2"}], "snowpackStructure": {"comment": "

Situation avalancheuse typique

couche fragile persistante neige vent\u00e9e

D \u00e9clenchements provoqu\u00e9s :

2000 m. Dans ces endroits, les plaques sont de grosses \u00e9paisseurs (possibilit\u00e9 de d\u00e9part en cascade), de taille 2 \u00e0 3 (moyenne \u00e0 grande). Ces plaques se trouvent parfois dans

les pentes d\u00e9j\u00e0 ski\u00e9es. Elles sont d\u00e9clenchables \u00e0 distances.

Observables : transport de neige, irr\u00e9gularit\u00e9s d'\u00e9paisseurs, fissures sous les skis.

D\u00e9parts spontan\u00e9s :

"}}}