| column name | FM12 code form |
remarks | FM94 code form |
|---|---|---|---|
| SV | FM12 | synoptic message version (FM12 / FM94) | FM94 |
| IIiii | IIiii | identification of a fixed land station | 0 01 001 — 0 01 002 |
| ix | ix | indicator for type of station operation ( Code table 1860 ) |
0 02 001 — 0 20 003 — 0 20 004 |
| h | h | height above surface of the base of lowest cloud seen ( Code table 1600 ) if only cloud cover (0 20 010) is set then → h = −1 ! FM12 = max 2500 m [classes] ! FM94 = >2500 m [true metres] |
0 20 013 — 0 20 010 |
| VV | VV | horizontal visiblity at surface ( Code table 4377 ) |
0 20 001 |
| N | N | total cloud cover ( Code table 2700 ) 0 20 010 ∕ 12.5 → [okta] 0 20 010 = 126 = 9 0 20 010 = 113 = 9 |
0 20 010 |
| DDD | dd | FM12 = true direction, in tens of degrees FM94 = true direction ( degree true ) |
0 11 001 |
| FF | ff | wind speed [ m∕s ] |
0 11 002 |
| TT | 1snTTT | air temperature, in tenths of degree celsius | 0 12 101 |
| TD | 2snTdTdTd | dew point temperature, in tenths of degree celsius | 0 12 103 |
| RH | UUU | relative humidity of the air, in percent only set in FM94 part |
0 13 003 |
| QFE | 3P0P0P0P0 | pressure at station level, in tenths of a hectopascal | 0 10 004 |
| QFF | 4PPPP | pressure at mean sea level, in tenths of a hectopascal | 0 10 051 |
| geopH | 4a3hhh | standard geopotential metres | 0 10 009 |
| a | a | characteristic of pressure tendency ( Code table 0200 ) |
0 10 063 |
| pp | ppp | amount of pressure tendency at station level | 0 10 061 |
| ww | ww | present weather −1 if ( 0 02 001 = 1 manned station and 0 20 003 = 508 / no sig. phenomenon to report ) |
0 20 003 |
| W1 | W1 | past weather −1 if ( 0 20 004 = 10 no sig. weather observed ) |
0 20 004 |
| W2 | W2 | past weather −1 if ( 0 20 004 = 10 no sig. weather observed ) |
0 20 005 |
| Nh | Nh | amount of all CL or CM cloud present ( Code table 2700 ) −1 if ( 0 20 011 >= 10 and 0 20 010 = def. ) |
0 20 011 — 0 20 010 |
| Cl | CL | clouds low ( Code table 0513 ) −1 if ( 0 20 012 − 30 >= 10 and 0 20 010 = def. ) NULL if ( 0 20 012 = undef. or 0 20 010 = undef. ) |
0 20 012 — 0 20 010 |
| Cm | CM | clouds middle ( Code table 0515 ) −1 if ( 0 20 012 − 20 >= 10 and 0 20 010 = def. ) NULL if ( 0 20 012 = undef. or 0 20 010 = undef. ) |
0 20 012 — 0 20 010 |
| Ch | CH | clouds high ( Code table 0509 ) −1 if ( 0 20 012 − 10 >= 10 and 0 20 010 = def. ) NULL if ( 0 20 012 = undef. or 0 20 010 = undef. ) |
0 20 012 — 0 20 010 |
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