{
"header":
{
  "format":"fixed width",
  "encoding":"ascii"
},
  "elements":
      {
        "RH":         {"description":"Relative humidity",                           "field_length":3,"column_type":"int8","valid_max":100,"valid_min":0},
        "N":          {"description":"Total cloud amount",                          "field_length":2,"column_type":"str","codetable":"what?"},
        "h":          {"description":"Height of low cloud",                         "field_length":2,"column_type":"object","codetable":"cloud_height_low"},
        "Nh":         {"description":"Amount of lower clouds",                      "field_length":2,"column_type":"str","codetable":"what?"},
        "AMT SIG":    {"description":"Significant cloud amount (tenths)",           "field_length":2,"column_type":"str","codetable":"what?"},
        "AMT":        {"description":"Significant cloud amount (eigths)",           "field_length":1,"column_type":"str","codetable":"cloud_amount_significant_eights"},
        "TYP":        {"description":"Type of significant cloud",                   "field_length":1,"column_type":"str","codetable":"cloud_type_significant"},
        "HGT SIG":    {"description":"Height of significant cloud",                 "field_length":2,"column_type":"str","codetable":"cloud_height_significant"},
        "ICE RPT A":  {"description":"Kind of ice",                                 "field_length":1,"column_type":"str","codetable":"ice_kind"},
        "ICE RPT B":  {"description":"Effect of ice on navigation",                 "field_length":1,"column_type":"str","codetable":"ice_effect"},
        "ICE RPT C":  {"description":"Bearing of ice edge",                         "field_length":1,"column_type":"str","codetable":"ice_edge_bearing"},
        "ICE RPT D":  {"description":"Dtce to ice edge from rptng ship",            "field_length":1,"column_type":"str","codetable":"ice_edge_distance"},
        "ICE RPT E":  {"description":"Orientation of ice edge",                     "field_length":1,"column_type":"str","codetable":"ice_edge_orientation"},
        "B A R":      {"description":"Barometer comparison station or data source", "field_length":1,"column_type":"str","codetable":"bar_compare_station"},
        "WND DIR":    {"description":"Wind direction",                              "field_length":2,"column_type":"str","codetable":"note in Section 1"},
        "VIS":        {"description":"Visibility",                                  "field_length":2,"column_type":"str","codetable":"visibility"},
        "WX":         {"description":"Present weather",                             "field_length":2,"column_type":"str","codetable":"need to look further"}
  }
}