{ "bulletins": [ { "regions": [ { "regionID": "GB-SCT-5" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "900" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "S" ] }, { "elevation": { "lowerBound": "900" }, "customData": [], "mainValue": "low", "aspect": [ "SW", "W", "NW" ] }, { "elevation": { "upperBound": "900" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wind_drifted_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10154", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "SC for 22.02. Localised windslab instabilities on N through E to S aspects above 900m. Avalanche Hazard Moderate. ", "avalancheActivityComment": "Forecast Snow Stability: Localised deposits of moderately bonded windslab will continue to develop on North through East to South aspects above 900 metres. This will mainly affect wind sheltered locations such as steep corrie headwalls, gully tops and the leeward side of ridge crests. On windward aspects and at lower elevations the snowpack will be generally stable. The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: Overnight Southerly winds, veering Westerly and increasing to Storm Force during the day. Light snow showers above 600 metres. The freezing level will rise from 600 metres to above the summits early morning before dropping again to 600 metres by mid-day.\nObserved Weather Influences: Storm Force North-Westerly winds. Snow showers above 700 metres. Freezing level around 850 metres.\nObservedSnowStability: Fresh deposits of moderately bonded windslab continue to build on North through East to South aspects above 900 metres. This was mainly affecting wind sheltered locations such as steep corrie headwalls, gully tops and the leeward side of ridge crests. On windward aspects and at lower elevations the snowpack is generally consolidating and stable. The avalanche hazard is Moderate." }, { "regions": [ { "regionID": "GB-SCT-2" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "900" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "S" ] }, { "elevation": { "lowerBound": "900" }, "customData": [], "mainValue": "low", "aspect": [ "SW", "W", "NW" ] }, { "elevation": { "upperBound": "900" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wind_drifted_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10155", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "NC for 22.2: Mild then cold. Instabilities on N,E,S aspects above 900m. Stabilising through the day; here also new windslab Mod Haz.", "avalancheActivityComment": "Forecast Snow Stability: Initially, instabilities will remain within recent windslab accumulations. Cornice collapse will also be a potential hazard mainly during the rise in temperature. Areas most affected will be steep and convex North through East to South aspects above 900 metres. On these aspects new accumulations of windslab will develop mostly around coire rims. As it turns cooler from day break onwards the old snowpack will begin to consolidate. The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: Gale to storm force Southerly winds overnight, becoming strong Westerly through the day. A dry night followed by snow at summit levels, these will become scattered, light, falling above 400 metres during the day. The freezing level will rise to above the summits overnight, then lower to 600 metres where it will remain for the duration of the day.\nObserved Weather Influences: Light snow showers on strong West-North-Westerly winds. The freezing level was around 900 metres.\nObservedSnowStability: Unstable windslab is present in steep wind sheltered locations. Above 900 metres these accumulations are most widespread on North-East to South-East aspects, more localised on North and South facing slopes. Fragile cornices overhang these areas. Better stability below 900 metres. Elsewhere the old snowpack is mostly scoured, firm and stable. The avalanche hazard is Considerable." }, { "regions": [ { "regionID": "GB-SCT-4" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "850" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE" ] }, { "elevation": { "lowerBound": "850" }, "customData": [], "mainValue": "low", "aspect": [ "S", "SW", "W", "NW" ] }, { "elevation": { "upperBound": "850" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wind_drifted_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10156", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "GC 22 Feb. Moderately bonded windslab on steep N, E to SE aspects mainly above 850m. Cornice soft and unstable. Av hazard Moderate.", "avalancheActivityComment": "Forecast Snow Stability: Existing windslab instabilities will consolidate in most places, before new areas of moderately bonded windslab again form in wind sheltered locations. Sheltered locations such as gullies, scarp slopes and steep coire rims and on slopes with a North through East to South-Easterly aspect above 850 metres will be mostly affected. Cornices will be unstable above similar aspects. The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: The freezing level will briefly rise above the summits in the early hours of Tuesday morning with rain. Then, freezing level will fall to around 600 metres with snow showers and strong to gale force Westerly winds. \nObserved Weather Influences: The freezing level rose to around 900 metres by 09.45hrs this morning then it slowly fell to around 800 metres. Intermittent precipitation fell mostly as snow above 850 metres and the winds were fresh to strong from a North-Westerly direction. Brighter, drier and lesser winds in the afternoon.\r\n\nObservedSnowStability: The older moist snowpack has generally consolidated. New accumulations of moderately bonded windslab was developing in wind sheltered locations. Areas mostly affected are sheltered gully exits, coire headwalls and steep slopes on North-East to South-Easterly aspects above 950 metres. The avalanche hazard is Moderate." }, { "regions": [ { "regionID": "GB-SCT-3" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "950" }, "customData": [], "mainValue": "moderate", "aspect": [ "NE", "E", "SE" ] }, { "elevation": { "lowerBound": "950" }, "customData": [], "mainValue": "low", "aspect": [ "N", "S", "SW", "W", "NW" ] }, { "elevation": { "upperBound": "950" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wind_drifted_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10157", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "LO for 22.2 Small amounts windslab on NE to SE aspects above 950m. Some fresh cornices forming. Moderate Hazard.", "avalancheActivityComment": "Forecast Snow Stability: Overnight the snowpack will consolidate at all levels. During the day small amounts of moderately bonded windslab will develop on North-East to South-East aspects above 950m. Areas most affected will be steep wind sheltered locations such as scarp slopes and gully tops. Soft fragile cornices will slowly develop above these aspects. All other aspects will be generally stable and icy. The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: Overnight the freezing level will rise to around summit level, then fall back quickly to 600m by morning and remain at this level throughout the day. There will be a period of sleet and snow to around summit levels early morning which will ease to light snow showers above 500 metres during the day. Winds will increase to strong Southerly, veering to become Westerly by dawn.\nObserved Weather Influences: Winds decreased to light North-Westerly throughout the day. It was a dry day with no precipitation and the freezing level stayed around 900 metres.\nObservedSnowStability: There are some small amounts of fresh, moderately bonded windslab, affecting steep sheltered locations above 1000 metres on East to South-East aspects. Small fresh cornices are also forming on these aspects. The dominant snowpack feature is a melt freeze crust on all aspects above 900 metres. The avalanche hazard is Low." }, { "regions": [ { "regionID": "GB-SCT-7" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "800" }, "customData": [], "mainValue": "moderate", "aspect": [ "NE", "E", "SE" ] }, { "elevation": { "lowerBound": "800" }, "customData": [], "mainValue": "low", "aspect": [ "N", "S", "SW", "W", "NW" ] }, { "elevation": { "upperBound": "800" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wind_drifted_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10158", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "TO 22/2 Brief instabilities overnight, steep NE to SE aspects above 850m. Fresh windslab, same terrain later. Av Haz Mod. ", "avalancheActivityComment": "Forecast Snow Stability: Overnight, there will be a brief period of wet snow instability affecting existing localised areas of moderately bonded windslab. Steep summit slopes, gully exits and coire rims on North-East to South-East aspects above 800 metres will mostly be affected. Better stability through the day generally, but fresh isolated pockets of unstable windslab will build in same steep wind sheltered locations, The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: Rain at all levels in the early hours of the morning will turn showery through the day, wintry above 500 metres. Southerly winds will strengthen overnight with severe gales at summit level, veering to become strong Westerly by daybreak. The freezing level will briefly rise well above the summits overnight, lowering to around 550 metres during daylight hours. \nObserved Weather Influences: Showers in the morning, some heavy and wintry above 700 metres, easing by early afternoon to give some bright spells. A strong North-West wind also eased by the afternoon and the freezing level hovered around 800 metres.\nObservedSnowStability: Although the snowpack has good stability in most locations, there are localised areas of moderately bonded windslab persisting on steep wind sheltered terrain, on mainly North-East to South-East aspects above 800 metres. Wind exposed ridges and summits are scoured and icy in places. Little snow exists below 400 metres. The avalanche hazard is Moderate." }, { "regions": [ { "regionID": "GB-SCT-6" } ], "validTime": { "startTime": "2022-02-21T18:00:00", "endTime": "2022-02-22T18:00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "850" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "E", "SE", "S" ] }, { "elevation": { "lowerBound": "850" }, "customData": [], "mainValue": "low", "aspect": [ "SW", "W", "NW" ] }, { "elevation": { "upperBound": "850" }, "customData": [], "mainValue": "low", "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "wet_snow" }, { "dangerRating": { "elevation": {}, "customData": [] }, "problemType": "cornice_failure" } ], "tendency": { "validTime": {} }, "bulletinID": "GB-SCT-10159", "publicationTime": "2022-02-21T00:00:00", "avalancheActivityHighlights": "CM for 22/2:Wet snow instabilities overnight NE, SE asp. above 850m. New thin windslab above 850m,on E aspects during day. Mod Haz", "avalancheActivityComment": "Forecast Snow Stability: There will be wet snow instabilities for a period overnight, mainly in steep North-East to South-Easterly aspects above 800m. Weak cornices around coire rims of these same aspects will be liable to collapse. Stability will then generally improve from daylight, although some thin new windslab development is possible in high, steep sheltered mainly Easterly aspects above 850 metres. Good stability on all wind scoured slopes. The avalanche hazard will be Moderate.", "snowpackStructureComment": "Forecast Weather Influences: Fluctuating temperatures over the period will bring some rain to all elevations overnight. The freezing level will then lower again to around 600 metres during the day, with some snow showers down to 400 metres. Overnight gale force Southerly winds will ease slightly and become West-South-West, then Westerly from first light. \nObserved Weather Influences: It has been a damp day, with bright periods and some rain. A steady thaw is in place below 600 metres. Isolated snow showers affected the area above 800 metres. The winds have been moderate to strong, mainly North-North-Westerly.\nObservedSnowStability: The snowpack has become moist to wet and stable below 600 metres. Accumulations of humid windslab, some deep in places, remain on steep mainly East to South-Easterly aspects above 700 metres. Residual weaknesses were noted in these deposits, which are in places only marginally bonded. Weak cornices are also in place above coire rims. The avalanche hazard is Moderate." } ] }