{ "bulletins": [ { "regions": [ { "regionID": "AT-05-17" }, { "regionID": "AT-05-16" }, { "regionID": "AT-05-11" }, { "regionID": "AT-05-10" }, { "regionID": "AT-05-09" }, { "regionID": "AT-05-07" }, { "regionID": "AT-05-06" }, { "regionID": "AT-05-05" }, { "regionID": "AT-05-03" }, { "regionID": "AT-05-18" } ], "validTime": { "startTime": "2021-04-08T22:00:00+00:00", "endTime": "2021-04-09T22:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2400" }, "customData": [], "mainValue": "considerable" }, { "elevation": { "upperBound": "2400" }, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S" ] }, "problemType": "wind_drifted_snow", "comment": "near to and distant from ridges, behind protruberances: soft, easily triggered snowdrifts" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] }, "problemType": "wet_snow", "comment": "impulse from warmth, daytime cycle of naturally triggered avalanches" } ], "tendency": { "validTime": {}, "tendencyComment": "On Saturday, caution urged towards foehn-induced snowdrifts on north-facing slopes. Elsewhere the trigger-sensitivity of snowdrifts will recede. At intermediate altitudes, daytime cycle of naturally triggered avalanches." }, "bulletinID": "RID813RGR1", "publicationTime": "2021-04-08T16:00:00+00:00", "avalancheActivityHighlights": "Snowpack more prone to triggering with ascending altitude", "wxSynopsisComment": "On Friday, initially sunny weather with good visibility. Starting at midday, high-altitude cloudbanks will pass through, visibility can become diffuse. In the Tauern, southerly foehn wind will be blowing (40-50 km/hr), in the Northern Alps the winds will be moderately strong. Warmth is anticipated at all altitudes. At 2000 m: -3 to +2 degrees; at 3000 m: -8 to -5 degrees.On Saturday, following a night of variably cloud skies, initially rather overcast. Starting at midday, sunny. Foehn-influence will continue, amid similar temperatures.", "avalancheActivityComment": "Avalanche danger above 2400 m is CONSIDERABLE, below that altitude MODERATE. Two problems threaten:\r\n1. Snowdrift threat: avalanche prone locations primarily above the treeline behind protruberances near to and distant from ridgelines in steep N-E-S aspects and in steep gullies in all aspects. Proneness to triggering increases with ascending altitude, in high/high-alpine regions even the weight of one single skier is sufficient to release a small-to-medium slab avalanche. Most treacherous of all: extended eastern aspects where isolated naturally triggered medium-sized slab avalanches are possible.\r\n2. Daytime loss of firmness: on sun-drenched steep rocky slopes, naturally triggered small-to-medium sized (wet) loose-snow avalanches are possible. On very steep grassy slopes below about 1800 m, also naturally triggered small-to (in isolated cases) medium sized glide-snow avalanches are possible.", "snowpackStructureComment": "The fresh snow of recent days (20-40 cm widespread, 60-70 cm in barrier cloud regions) has settled somewhat and is moistened at least superficially up to altitudes of 2000 m. At high altitudes there is still trigger-sensitive snowdrift (deposited atop a loosely-packed base) which was formed by storm-strength W/N winds and has settled somewhat. At low and intermediate altitudes, the warmth and melt-water seepage has caused a loss of firmness in the fresh snow. On very steep slopes (and at the beginning of the week, already snow-bare slopes) the fresh snow is gliding away as a mass." }, { "regions": [ { "regionID": "AT-05-01" } ], "validTime": { "startTime": "2021-04-08T22:00:00+00:00", "endTime": "2021-04-09T22:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S" ] }, "problemType": "wind_drifted_snow", "comment": "isolated avalanche prone locations behind protruberances and in gullies" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wet_snow", "comment": "small, superficial loose-snow avalanches on very steep sunny slopes" } ], "tendency": { "validTime": {}, "tendencyComment": "On Saturday, caution urged towards foehn-induced snowdrifts on north-facing slopes (small danger zones, easily recognized). Hardened surfaces at intermediate altitude will turn to firn snow with the sunshine." }, "bulletinID": "RID813RGR2", "publicationTime": "2021-04-08T16:00:00+00:00", "avalancheActivityHighlights": "Small danger zones due to snowdrifts, small naturally triggered loose-snow avalanches", "wxSynopsisComment": "On Friday, sunny weather will initially dominate, with good visibility. Starting at midday, high-altitude cloudbanks will increase, visibility can become diffuse. A foehn-induced southerly wind will arise (30-50 km/hr). Warmth is anticipated at all altitudes. At 2000 m: -5 to +1 degree.\r\nOn Saturday, following a night of variably cloudy skies, initially rather overcast. Starting at midday it will turn sunny. Foehn wind influence will continue, with similar temperatures.", "avalancheActivityComment": "Avalanche danger is LOW. Only isolated avalanche prone locations exist for mostly small, dry-snow slabs behind very steep protruberances and in gullies. There, triggering an avalanche can force a fall. Superficial naturally triggered (wet) loose-snow avalanches are possible in sun-drenched steep terrain, they will remain small-sized.", "snowpackStructureComment": "Well-settled, compact old snowpack. In wind-protected terrain, only a few centimetres of fresh snow on top of this. In wind-exposed zones, intermittently strong-velocity NW winds transported the snow, depositing thin drifts on leeward slopes. Solar radiation and daytime warmth will moisten the snowpack\u2019s upper layers." }, { "regions": [ { "regionID": "AT-05-19" }, { "regionID": "AT-05-20" }, { "regionID": "AT-05-21" }, { "regionID": "AT-05-14" }, { "regionID": "AT-05-15" }, { "regionID": "AT-05-13" }, { "regionID": "AT-05-12" }, { "regionID": "AT-05-08" }, { "regionID": "AT-05-04" }, { "regionID": "AT-05-02" } ], "validTime": { "startTime": "2021-04-08T22:00:00+00:00", "endTime": "2021-04-09T22:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] }, "problemType": "wet_snow", "comment": "warmth impulse: powerful" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S" ] }, "problemType": "wind_drifted_snow", "comment": "behind protruberances, in gullies, steep bowls" } ], "tendency": { "validTime": {}, "tendencyComment": "On Saturday, foehn-induced snowdrifts require caution in the Tauern region, elsewhere the trigger-sensitivity of snowdrifts will recede. At intermediate altitudes, daytime cycle of naturally triggered avalanches." }, "bulletinID": "RID813RGR3", "publicationTime": "2021-04-08T16:00:00+00:00", "avalancheActivityHighlights": "Daytime loss of snowpack firmness, avoid high-altitude snowdrifts", "wxSynopsisComment": "On Friday, initially sunny weather with good visibility. Starting at midday, high-altitude cloudbanks will pass through, visibility can become diffuse. In the Tauern, southerly foehn wind will be blowing (40-50 km/hr), in the Northern Alps the winds will be moderately strong. Warmth is anticipated at all altitudes. At 2000 m: -3 to +2 degrees; at 3000 m: -8 to -5 degrees.\r\nOn Saturday, following a night of variably cloudy skies, initially rather overcast. Starting at midday it will turn sunny. Foehn wind influence will continue, with similar temperatures.", "avalancheActivityComment": "Avalanche danger above 2400 m is MODERATE. Two problems threaten:\r\n1. Snowdrift threat: avalanche prone locations primarily above the treeline behind protruberances near to and distant from ridgelines in steep N-E-S aspects and in steep gullies in all aspects. Proneness to triggering increases with ascending altitude, in high/high-alpine regions even the weight of one single skier is sufficient to release a small-to-medium slab avalanche. Most treacherous of all: extended eastern aspects.\r\n2. Daytime loss of firmness: on sun-drenched steep rocky slopes, naturally triggered small-to-medium sized (wet) loose-snow avalanches are possible. On very steep grassy slopes below about 1800 m, also naturally triggered small-to (in isolated cases) medium sized glide-snow avalanches are possible.", "snowpackStructureComment": "The fresh snow of recent days (20-40 cm widespread, 60-70 cm in barrier cloud regions) has settled somewhat and is moistened at least superficially up to altitudes of 2000 m. At high altitudes there is still trigger-sensitive snowdrift (deposited atop a loosely-packed base) which was formed by storm-strength W/N winds and has settled somewhat. At low and intermediate altitudes, the warmth and melt-water seepage has caused a loss of firmness in the fresh snow. On very steep slopes (and at the beginning of the week, already snow-bare slopes) the fresh snow is gliding away as a mass." } ] }