date     leadtime location  lat   lon   altitude  obs   fcst
20120101 0        3         50    10    12    3     6
20120101 1        3         50    10    12    5     7
20120101 2        3         50    10    12    NA     7
20120101 3        3         50    10    12    3     .
20120101 4        3         50    10    12    na     nan
20120101 5        3         50    10    12    3     7
