18th March 2021
The Scottish Avalanche Information Service issues information to support permitted activity under current Scottish Government guidance.
This blog is intended to provide hazard and mountain condition information to help plan safer mountain trips.
It was very much a spring feel in the Northern Cairngorms today with a temperature of plus 6 degrees Celsius on Cairngorm at midday. As might be expected the snowpack is soft and moist at all elevations, although it did firm up a little overnight.
Tomorrow any refreeze of the snow surface is likely to be very limited and the snowpack will remain soft and moist. At lower elevations the cover is patchy, and will continue to become more depleted. Due to the mild temperatures the snowpack will continue to consolidate and will remain well bonded.
Cornices will remain prone to collapse where they are drooping over corrie rims. In addition there are some glide cracks starting to appear on crag aprons and at the base of some gullies as the snow starts to creep. These will continue to develop and widen. Although these are not a specific avalanche hazard per se, they may present a hazard to unsuspecting skiers dropping in from above.
Looking towards Alladin’s Buttress, with avalanche debris still visible in the bottom left from a large avalanche earlier in the season. The crown wall is still visible under the crags (top left). Interesting observation from another SAIS Forecaster in the Southern Cairngorms who suggested that many of the larger avalanches this season have occurred on steep slopes well below the corniced corrie rims. That is certainly the case here in Coire an t-Sneachda, Coire an Lochain, and in Garbh Coire Mor beneath Sgor an Lochain Uaine (The Angel’s Peak).
The view into Coire an t-Sneachda. Left to Right: Mess of Pottage, Alladin’s Buttress, Fiacaill Buttress and Fiacaill Ridge. There are still large and drooping cornices above Jacob’s Ladder and Alladin’s Couloir.
Granite (fissure) in Coire an t-Sneachda. Porphyritic in nature this example, due to the visible feldspar phenocrysts.
Cairngorm Granite, formed in the Cairngorm Pluton 419-444 million years ago in the Silurian Period. [As a Forecaster it always strikes me that there is a certain similarity between the cooling of igneous rocks and the behaviour of snow on the ground… Although to be fair this may not be a widely held opinion!].
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