i remember running a shortened course a few years ago,it was due to very strong winds,some of the rocks on top of Elidir fach were getting blown along the ground you could hardly stand up.the route by-passed the lliwedd and went up the pyg track to snowdon,but the weather did improve during the day though as i remember.personnaly i cant see the fun in running in such difficult conditions,i`d just opt out and do some quality training session lower down,the race will still be there next year and the mountain will most certainetly be.