The ski courses seem to not have that issue. Maybe it's due to the volume of snow they produce. Joe M. On 12/5/2016 10:29 AM, David C Brown wrote: > Surely you need ambient to be below freezing or your snow will melt as fa= st > as it forms? --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .