A weak layer

23rd January 2021

Covid -19
The Scottish Avalanche Information Service issues information to support permitted activity under current Scottish Government guidance.
Please be aware of current mandatory travel restrictions in Local Authority areas within Scotland and respect local communities by referring to Scottish Government guidance and safe route choices for exercise. For further guidance please refer to the following information for hillwalkers and climbers and snowsports on ski and board.
This blog is intended to provide hazard and mountain condition information to help plan safer mountain trips.
It was a cold clear day today. The weak layer underneath the windslab is widespread and will persist while the temperatures remain low. Greatest accumulations of windslab are on East to South aspects with more localised accumulations present on South-West and North-East aspects. Slopes exposed to the recent winds are scoured and stable.

Looking across Loch Avon to the Shelter Stone Crag from Stac an Fharaidh. If you look across the top of Stag Rocks (right hand side) you can see cornices have developed and there are significant accumulations of windslab on the South-East facing slopes. This windslab overlies a soft weak layer and is poorly bonded. You can also just make out some drifting in the moderate westerly winds.


Looking up into Coire Raibert from Stac an Fharaidh. You can see the sastrugi in the foreground. There is plenty of this on the plateau and any area exposed to the recent winds.


More windslab accumulations on an East aspect.

Comments on this post

Got something to say? Leave a comment

    Latest Northern Cairngorms Avalanche Report
    RSS Feed
    Keep up to date by subscribing to our RSS feed
Service funded by sportscotland
Forecast data supplied by the Met Office
SAIS Sponsors