I couldnt find any topics on this but im after snow on my snow-themed map but i havnt found out how after ages of searching, i found one topic but that told me roughly how to do it but he/she had problems getting it to work.
Ive tried Key: atmosphere
Value: T=SNOW,B=5 10,C=0.5,G=0.3 2,BV=20 30,GV=25 40,W=3 5,D=2400
Ive drawn tracemap but snow doesnt work so i was hoping if anyone say how to do it.