Some useful info may be gleaned from the Wikipedia article on snowmaking...= apparently threshold temp for snowmaking increases as air humidity decreas= es. Graph shows what temp/humidities are viable. Also some info there re in= creasing viable temperature with "nucleating agents". Have fun~! --=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 .