In reply to UKC News:
Hi Folks
Just come in from a rescue/search for fallen walkers on W side of Snowdon about an hour ago. There is is considerable windslab possibility on west and south facing aspects. There is quite a bit of wind blown and redeposited snow, and was still snowing heavily at 8pm above 2000ft. We dug some pits in deep snow at 2700 ft just south of the Snowdon Ranger path, and found a depth of some 18 inches of windslab above a frozen layer, with a layer of graupel or unconsolidated crystals below that. On testing the block sheared with very little pressure, just some light hand pressure.
I guess this means that in particular many grade 1 or 2 gullies in Snowdonia could have some real avalanche risks. Also remember that just because a gully generally does not have this aspect, there could be elements or side walls of the gully that still accumulate redeposited snow.
Have fun but play safe!