In this article we present our fifteenth annual report on the survival of Scottish snow patches. Last year's report (Watson et al., 2010) also commented on snow survival in England and this was extended by Cameron (2010). This year we confine ourselves to Scotland, as a later article by Cameron is planned to cover its incidence south of the Scotland/England border.
MethodsOur account relies on field observations. Unattributed observations are by authors AW, IC, DD and JP, information from others being personal communications. Measurements give greatest length, breadth and depth in that order. A map in Watson et al. (2007) showed the main place names.On the website www.winterhighland.info, IC repeated his annual thread with Attention all walkers! 2010 snow patch season. The number of observers in that thread rises year-by-year. Measurement of patches by tape has become common, and notes and photographs result in an archive of historical and research value, which is available freely to all.