Code for Ship Weather Reports
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Code format
| B B X X | CALLSIGN | ||
| Y Y G G iw | 9 9 La La La | Qc Lo Lo Lo Lo | 4 ix h V V |
| N d d f f | 1 sn T T T | 2 sn Td Td Td | 4 P P P P |
| 5 a p p p | 7 w w W1 W2 | 8 Nh CL CM CH | 2 2 2 Ds Vs |
| 0 ss Tw Tw Tw | 2 Pw Pw Hw Hw | 3 dw1 dw1 / / | 4Pw1Pw1Hw1Hw1 |
| 6 Is Es Es Rs | 8 sw Tb Tb Tb | ICE | ci Si bi Di zi |
Meanings of each group
| B B X X : Identifier of a ship weather report |
| CALLSIGN : Call sign of the VOS |
| Y Y G G iw : Y Y - Day of month (UTC) G G - Time of observation to nearest hour (UTC) iw - Wind speed indicator |
| 9 9 La La La : 9 9 - Indicator for sea station position groups La La La - Latitude, degrees and tenths |
| Qc Lo Lo Lo Lo : Qc - Quadrant of the globe Lo Lo Lo Lo - Longitude, degrees and tenths |
| 4 ix h V V : 4 - Indicates that precipitation group is omitted ix - Indicator for weather group h - Height of base of the lowest cloud V V - Horizontal visibility |
| N d d f f : N - Total cloud amount d d - Direction of surface winds (true direction, in tens of degrees) f f - Speed of surface winds |
| 1 sn T T T : 1 - Group indicator for air temperature sn - Sign of temperature (0 for 0 ?C or above, 1 for below 0 ?C) T T T - Air temperature in whole degrees or and tenths |
| 2 sn Td Td Td : 2 - Group indicator for dew-point temperature sn - Sign of temperature (0 for 0 ?C or above, 1 for below 0 ?C) Td Td Td - Temperature of dew-point in whole degrees or and tenths |
| 4 P P P P : 4 - Group indicator for pressure P P P P - Mean sea level pressure in hectopascal and tenths, thousands digit omitted |
| 5 a p p p : 5 - Group indicator for pressure change a - Characteristic changes in atmospheric pressure in last 3 hours p p p - Change of pressure in tenths of hectopascal during last 3 hours |
| 7 w w W1 W2 : 7 - Group indicator for weather w w - Present weather W1 W2 - Past weather during the preceding 6 hours |
| 8 Nh CL CM CH : 8 - Group indicator for clouds Nh - Total amount of low clouds (or medium clouds, if no low clouds) CL - Type of low clouds: Cu, Cb, Sc, St CM - Type of medium clouds: Ac, As, Ns CH - Type of high clouds: Ci, Cs, Cc |
| 2 2 2 Ds Vs : 2 2 2 - Section indicator for maritime data Ds - Ship's course made good during the past 3 hours Vs - Ship's average speed during the past 3 hours |
| 0 ss Tw Tw Tw : 0 - Group indicator for sea surface temperature ss - Sign and type of measurement of sea surface temperature Tw Tw Tw - Sea surface temperature in whole degrees and tenths |
| 2 Pw Pw Hw Hw : 2 - Group indicator for wind waves Pw Pw - Period of wind waves in seconds Hw Hw - Height of wind waves in units of half metre |
| 3 dw1 dw1 / / : 3 - Group indicator for swell directions dw1 dw1 - Direction in tens of degree from which the predominant swell is coming |
| 4 Pw1 Pw1 Hw1 Hw1 : 4 - Group indicator for period and height of the predominant swell Pw1 Pw1 - Period of the first (predominant) swell in seconds Hw1 Hw1 - Height of the first (predominant) swell in units of half metre |
| 6 Is Es Es Rs : 6 - Group indicator for ice accretion Is - Type of ice accretion EsEs - Thickness of ice in cm Rs - Rate of ice accretion |
| 8 sw Tb Tb Tb : 8 - Group indicator for wet bulb temperature sw - Sign and type of wet bulb temperature Tb Tb Tb - Wet bulb temperature in whole degrees and tenths |
| ICE : Indicator, ice group follows |
| ci Si bi Di zi : ci - Concentration or arrangement of sea ice Si - State of development bi - Ice of land origin Di - Bearing of principal ice edge zi - Ice situation and trend over preceding 3 hours |