There’s been a very big rockfall down most of Cwm Silyn's Great Slab, originating from the top of the Slab between Ordinary Route and Kirkus Route.
While Outside Edge and Ordinary Route can still be climbed after a fashion, both are in an awful condition. Eg. the only clean part on Ordinary Route is the steep chimney crack at the start of pitch 3. The rest of the route is covered with loose debris. Outside Edge is in an equally awful condition as well.
The state of routes to the right - Central Variant, Kirkus' Route etc. - is less clear, but they are likely to be in a similar condition. It seems to be the case that most of the slab is covered in loose rock debris. Also there are many scars on the slab caused by the rockfall. A lot of the scree at the base of the Slab looks to have been washed away too.
There are still lots of dangerous, loose rocks and debris teetering at the top of the slab. Further damaging and dangerous rockfall is a very real possibility.
It goes without saying that none of the routes on Great Slab should be climbed at this moment in time. The whole area at the top of the slab is still extremely unstable, so much so that climbers should avoid the whole area, at the very least until a full risk assessment has been made.
Dave Williams
BMC Local Access Rep.
Post edited at 22:29