01-20	light storm (d20 hours)
21-28	heavy storm (d40 hours)
29-35	fog (d20 yards visibility)
36-39	extra hot/cold (d4 days)
40-54	stream in path
55-72	swarm/flock
77-78	Celtic ruin
79-93	lake or pond
94	unmarked tomb
95	part of animal skeleton
96	human skeleton
97-00	remains of small settlement