{ "bulletins": [ { "regions": [ { "regionID": "GB-SCT-5" } ], "validTime": { "startTime": "2021-12-29T18:00:00", "endTime": "2021-12-30T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "gliding_snow" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9831", "publicationTime": "2021-12-29T00:00:00", "avalancheActivityHighlights": "SC for 30/12 Thaw conditions. Cornice collapse possible. Snow mostly wet, but well bonded and stable. Avalanche hazard will be Low.", "avalancheActivityComment": "Forecast Snow Stability: The snow will continue to thaw in the mild and wet conditions with significant depletion of cover expected at lower elevations. The snow will be generally well bonded and stable but any remaining small cornices will be prone to collapse. These will most frequently be encountered on West to North aspects above 900 metres. The avalanche hazard will be Low.", "snowpackStructureComment": "Forecast Weather Influences: A dry night followed by a period of rainfall which will cease just after day break. Strong West-South-Westerly winds throughout. Freezing level above the summits.\nObserved Weather Influences: Light snowfall on very strong South-Easterly winds, this turned to rain at lower elevations as the freezing level rose during the day. Freezing level around 900 metres at midday.\nObservedSnowStability: The remaining snow is softening in the milder conditions at lower elevations but remains firmer above 900 metres. The well bonded and stable cover is patchy in most locations with some deeper accumulations present in wind sheltered locations on West to North aspects above 900 metres. The avalanche hazard is Low." }, { "regions": [ { "regionID": "GB-SCT-4" } ], "validTime": { "startTime": "2021-12-29T18:00:00", "endTime": "2021-12-30T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9832", "publicationTime": "2021-12-29T00:00:00", "avalancheActivityHighlights": "GC 30/12 Snowpack mainly stable.Surface wet snow instabilities possible on NW to E aspects above 900m. Cornices unstable. Av haz Low", "avalancheActivityComment": "Forecast Snow Stability: The snowpack will consolidate further, remaining soft and wet but generally stable. Some localised surface wet snow instabilities may still exist on steeper slopes. Most affected areas will be above 900 metres in steep wind sheltered places, such as coire rims, gully tops and scarp slopes mainly with a North-West through North to East aspects. Any remaining cornices will be soft and prone to collapse. The avalanche hazard will be Low", "snowpackStructureComment": "Forecast Weather Influences: The freezing level will be above the highest summits for all of this period. Rain at all levels, heaviest in the early part of the morning, becoming drier in the afternoon, winds will be strong from a South-Westerly direction.\nObserved Weather Influences: It snowed above 850 metres during the morning these snow showers turned to rain in the afternoon as the freezing level rose above the highest tops, summit temperatures of plus 2 degrees Celsius by 2pm. Very strong winds started out from the East-South-East then veered to the South-West and remained strong.\r\n\nObservedSnowStability: New snow fell mainly above 850 metres these deposits are not significant and started to thaw early afternoon. The shallow snowpack has become moist as rain affected the area leading to some localised surface wet snow instabilities. Most affected locations were above 900 metres on steep wind sheltered locations, such as coire rims, gully tops and scarp slopes mainly with a North-West through North to East aspect. Any remaining cornices are prone to collapse. The avalanche hazard is Low." }, { "regions": [ { "regionID": "GB-SCT-3" } ], "validTime": { "startTime": "2021-12-29T18:00:00", "endTime": "2021-12-30T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9833", "publicationTime": "2021-12-29T00:00:00", "avalancheActivityHighlights": "LO for 30/1: A thawing and generally stable snowpack. Low hazard", "avalancheActivityComment": "Forecast Snow Stability: Any recent fresh snow will quickly thaw in the warm conditions. Remaining snow will be mainly confined to high North and East facing corries. Snowpack stability will be generally good. The avalanche hazard will be Low.", "snowpackStructureComment": "Forecast Weather Influences: Strong South-Westerly winds with a period of rain early on Thursday morning. The freezing level will be above the summits. \nObserved Weather Influences: Frequent snow showers above 900m this morning followed by warmer and drier conditions in the afternoon.\nObservedSnowStability: Localised fresh areas of unstable snow have formed with greatest accumulations being on steep North, North-East and East aspects above 1000m. Above 900m there is a general cover of fresh snow, although this has started to thaw during the afternoon. The avalanche hazard is Moderate." }, { "regions": [ { "regionID": "GB-SCT-7" } ], "validTime": { "startTime": "2021-12-29T18:00:00", "endTime": "2021-12-30T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9834", "publicationTime": "2021-12-29T00:00:00", "avalancheActivityHighlights": "TOR for 30.12. The little remaining snow will remain stable. The avalanche hazard will be Low.", "avalancheActivityComment": "Forecast Snow Stability: The little remaining snow above 750 metres will be stable and continue to thaw. The avalanche hazard will be Low.", "snowpackStructureComment": "Forecast Weather Influences: Winds will be South-Westerly, gale force overnight and only moderating slightly later in the day. Light overnight rain at all levels will clear by morning to leave a dry day. The freezing level will remain above the summits throughout the forecast period.\nObserved Weather Influences: A dry and frosty start to the day in the glens with cloud above the summits initially. Light Westerly winds. As the day progressed there were heavy and prolonged showers falling as rain at all levels. Freezing level above the summits.\nObservedSnowStability: The little remaining snow is well bonded and stable. The old snow patches from earlier storms, primarily in deeper stream beds and gullies are generally firm with a gradually softening surface in the mild temperatures. The avalanche hazard is Low." }, { "regions": [ { "regionID": "GB-SCT-2" } ], "validTime": { "startTime": "2021-12-28T18:00:00", "endTime": "2021-12-29T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "persistent_weak_layers" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9825", "publicationTime": "2021-12-28T00:00:00", "avalancheActivityHighlights": "NC 29.12. Firm slab over weak layer W-NW-N-NE above 1000m - Isolated and avoidable. Stabilising trend. Avalanche hazard will be Low.", "avalancheActivityComment": "Forecast Snow Stability: Slopes will remain extensively scoured, icy and with a thin dusting of snow above 900m. Accumulations of firm windslab will continue to overlie a weak layer, but these will remain isolated and avoidable. Most affected will be very steep locations such as coire rims, scarp slopes and gully tops of a West through North to North-Easterly aspects above 1000m. The snowpack will become increasingly depleted below 1000m over the period due to rising temperatures. The avalanche hazard will be Low.", "snowpackStructureComment": "Forecast Weather Influences: Dry over night, but with precipitation expected to arrive from mid morning. This will initially fall as snow above 1000 metres before turning to rain at all levels later. The freezing level will be around 600 metres overnight rising quickly above the summits by midday. Winds will be South-South-Easterly during daylight hours. Initially they will be light but quickly build to gale force.\nObserved Weather Influences: A dry and calm day with very light winds from the South-East. The freezing level was around 1000 metres at midday, although the ground remained cold and frozen above 750 metres.\nObservedSnowStability: Firm windslab overlies a weak layer in isolated locations above 900 metres. Most affected are very steep, wind sheltered locations such as coire rims, scarp slopes and gully tops of a West through North to North-East aspect. Outwith these locations the ground is extensively scoured, with firm, well consolidated snow patches and a thin dusting of snow over bare ground. The avalanche hazard is Moderate." }, { "regions": [ { "regionID": "GB-SCT-6" } ], "validTime": { "startTime": "2021-12-28T18:00:00", "endTime": "2021-12-29T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-9826", "publicationTime": "2021-12-28T00:00:00", "avalancheActivityHighlights": "CM for 29/12: Localised wet snow instabilities on NW, N to NE aspects above 800m. Low Hazard.", "avalancheActivityComment": "Forecast Snow Stability: Good stability in old patchy accumulations. Some localised, new wet snow instabilities are possible during the day in any new deposits on North-West through North to North-Easterly facing gully heads and around coire rims. New accumulations are not expected to achieve depth. The avalanche hazard will be Low.", "snowpackStructureComment": "Forecast Weather Influences: It will stay dry and relatively cool overnight before high pressure is replaced by a new frontal system bringing milder and wetter conditions from dawn. The light Southerly airflow will strengthen to gale force SSE accompanied by a mixture of rain, sleet and snow to around 800 metres during the day\nObserved Weather Influences: A few snow showers early in the period, thereafter it was a fine dry day. Cool on tops with light variable winds.\nObservedSnowStability: A light general cover of snow exists above around 400 metres. Fluctuating temperatures have resulted in a rapid consolidation of recent deposits, which although now softening below 800m remains crunchy underfoot. Some deeper accumulations exist above 800 metres. Stability is generally good. The avalanche hazard is Low." } ] }