{ "bulletins": [ { "regions": [ { "regionID": "AT-05-19" }, { "regionID": "AT-05-20" }, { "regionID": "AT-05-21" }, { "regionID": "AT-05-13" }, { "regionID": "AT-05-12" }, { "regionID": "AT-05-08" } ], "validTime": { "startTime": "2021-02-01T17:00:00+00:00", "endTime": "2021-02-02T17:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "NW" ] }, "problemType": "persistent_weak_layers", "comment": "near to and distant from ridgelines. triggering primarily by large additional loading" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "gliding_snow", "comment": "on very steep grass-covered slopes" } ], "tendency": { "validTime": {}, "tendencyComment": "The next few days will be rather mild, with light rainfall during the next two nights. The snowdrift provlem will recede. The snowpack surface will become moist." }, "bulletinID": "RID318RGR1", "publicationTime": "2021-02-01T17:00:00+00:00", "avalancheActivityHighlights": "Moderate snowdrift problem and glide-snow problem", "wxSynopsisComment": "On Tuesday, northern regions could get minor rainfall. Thereafter clouds will disperse and a few hours of sunshine are anticipated. In the afternoon, cloud cover will move in again. Light winds. At 1500 m, +4 degrees, rising in the afternoon; at 2000 m, -4 to +1 degree.", "avalancheActivityComment": "Above the timberline, isolated NW-NE-E  facing slopes can trigger a dry-snow slab avalanche in very steep terrain by large additional loading. Snowdrift accumulations prevail both near to and distant from ridgelines in wooded zones. Slab releases can grow to medium size. Below the treeline, small slides of wet-snow and isolated naturally triggered glide-snow avalanches are possible in extremely steep grassy terrain.", "snowpackStructureComment": "Light rain, warmth and sunshine are making the uppermost snowpack layer soft and moist. Beneath the most recent snowdrifts are weak layers which can still be triggered in some places. The snowpack is relatively isotherm in nearly all aspects, varyingly moist deeper down. Near to ground level there is unbonded granular snow from the beginning of January, generally moist." }, { "regions": [ { "regionID": "AT-05-16" }, { "regionID": "AT-05-17" }, { "regionID": "AT-05-18" }, { "regionID": "AT-05-14" }, { "regionID": "AT-05-15" }, { "regionID": "AT-05-11" }, { "regionID": "AT-05-07" }, { "regionID": "AT-05-10" }, { "regionID": "AT-05-06" }, { "regionID": "AT-05-09" }, { "regionID": "AT-05-05" }, { "regionID": "AT-05-04" } ], "validTime": { "startTime": "2021-02-01T17:00:00+00:00", "endTime": "2021-02-02T17:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "1800" }, "customData": [], "mainValue": "considerable" }, { "elevation": { "upperBound": "1800" }, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "NW" ] }, "problemType": "wind_drifted_snow", "comment": "near to and distant from ridgelines, above 1800 m, often by minimum additional loading" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] }, "problemType": "persistent_weak_layers", "comment": "triggerable in transitions from shallow to deep snow, by large additional loading" } ], "tendency": { "validTime": {}, "tendencyComment": "The next few days will become milder still. The snowdrift problem will recede. Superficial layers on sunny slopes and in general at low altitudes, the snow will become moist." }, "bulletinID": "RID318RGR2", "publicationTime": "2021-02-01T17:00:00+00:00", "avalancheActivityHighlights": "Ongoing snowdrift problem above 1800 m", "wxSynopsisComment": "On Tuesday, minor showers will move through the northern regions (snowfall level 1400 m). Further towards the Tauern it will remain dry. Sunshine in the morning and past midday, accompanied by a few clouds. In the afternoon, clouds will increase. Light winds, at high altitudes 30 km/hr. At 2000 m; -4 to +1 degree; at 3000 m, -10 to -5 degrees:", "avalancheActivityComment": "Above 1800 m on very steep slopes a dry-snow slab avalanche can be triggered, primarily in NW-NE-E aspects. Slab releases can grow to medium-to-large size. Most treacherous: the recently formed snowdrift accumulations which occur both near to and distant from ridgelines and are easy to recognize. Caution urged (or better yet, circumvent) all shallow-snow zones on steep slopes and transitions from shallow to deep snow. In those places the snowpack should be left in peace.", "snowpackStructureComment": "The most recent snowfall is moist below 1800 m and higher up. Wind-exposed terrain is hard or windblown. Superficial layers, i.e. the uppermost 30 cm, evidence weak layers (hoar, some cold-on-warm effect) which in places are still instable. The deeper-down layers have an old-snow problem from the beginning of January (unbonded granular crystals in the lowermost third of the snowpack) and can still be triggered with heavy additional loading." }, { "regions": [ { "regionID": "AT-05-02" }, { "regionID": "AT-05-01" }, { "regionID": "AT-05-03" } ], "validTime": { "startTime": "2021-02-01T17:00:00+00:00", "endTime": "2021-02-02T17:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "1800" }, "customData": [], "mainValue": "considerable" }, { "elevation": { "upperBound": "1800" }, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wind_drifted_snow", "comment": "near to and distant from ridgelines, low additional loading is sufficient" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] }, "problemType": "persistent_weak_layers", "comment": "triggerable in transitions from shallow to deep snow" } ], "tendency": { "validTime": {}, "tendencyComment": "Starting on Wednesday, including in the Lungau, significantly warmer. The danger of slab avalanches will gradually recede." }, "bulletinID": "RID318RGR3", "publicationTime": "2021-02-01T17:00:00+00:00", "avalancheActivityHighlights": "Huge snowdrift accumulations above 2000 m", "wxSynopsisComment": "On Tuesday, high-altitude clouds will move through, subsequently it will become rather sunny. In late afternoon, more high-altitude cloud cover will move in. Visibility will be good. Generally only light winds, in exposed zones blowing at 30 km/hr. At 2000 m, milder than recent days: -2 to 0 degrees; at 3000 m: -8 degrees.", "avalancheActivityComment": "Slab avalanches can be triggered above 1800 m on some very steep slopes, particularly in E-S-W aspects. The impulse of one single skier is enough to do the trick. Avalanche prone locations are easily recognized for the trained eye, they occur both near to and distant from ridgeline terrain.", "snowpackStructureComment": "The storm winds of last Friday/Saturday created enormous snowdrift accumulations, especially above 2000 m. Gullies and bowls are filled to the brim, exposed terrain is windblown. Bonding between compact snowdrift layers and old snowpack layers is often inadequate. Deep inside the snowpack there are unbonded layers of granular crystals from the beginning of January widespread, above 1800 m in all aspects." } ] }