British Summer Time
25th March 2018
(Above) British Summer Time started today. Cue: snowfall, drifting for most of the day above 850m and 3 cornice triggered, but minor, dry slab avalanches.
(Above) En route to Coire Chriochairein. Visibility was pretty good between the showers and the sun came out intermittently. Old wet and quite deep snow below 750m which made for slow progress. Big contrast up near the plateau where winter clearly hadn’t been told that BST had been declared overnight.
(Above) Plumes of spindrift coming off the rim of Coire nan Gamhna. The lowest point of the coire rim is at 970m and snow is being carried away from the camera. W winds overnight turned more WNW during the day and carried a fair amount of spindrift. This was deposited as windslab high on lee slope coire rims and at gully heads where instability tended to be localised.
(Above) Detailed shot of Bellevue Buttress. This is a very steep and cold ENE aspect, with the cornice line at around 1060m. Note the ‘cones’ of loose snow at the base of the crags. This sluffed off earlier in the morning before the wind shifted to WNW. An interesting counterpoint to this was roller ball activity sparked off by the sun on steep S and SE aspects on the other side of the mountain.
(Above) Coire Chriochairein. E and ESE aspects between 1000 and 960m. Three minor cornice triggered dry slab avalanches here around midday. Left, right and centre of shot. New cornices tended to be relatively small but very fragile. Instability localised here above 950m with better stability at lower altitudes in most places as well as in all scoured locations.
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