As the clocks go back this weekend and darkness falls earlier, walkers and climbers are being reminded that summer is well and truly over in the mountains. Snow is being forecast for the tops this weekend, meaning conditions underfoot could be difficult. A thin covering of snow over bare rock or scree can make footholds extremely slippery, without giving enough purchase for crampon points or ice axes to bite well. Heather Morning, Mountain Safety Adviser for Mountaineering Scotland, said: “Conditions can be very treacherous at this time of year and just having the right equipment isn’t enough: you have to…