The header SSVX identifies bulletins of observations coded in FM 18-X.
Note: This code form replaced the former FM 18-IX Ext DRIFTER code.
Observations from buoys similar to observations from ships are encoded in the
SHIP code, FM 12 or FM 13, and are included in bulletins headed SMV/, SIV/ etc.
For a full decode please refer to the WMO Manual on Codes, Volume I.1 Part A:
WMO Publication No 306, available from: The WMO Secretariat
at PO Box 2300, CH-1211 Geneva 2, Switzerland, price Sw Fr 130.- (February 1998)
The following Sections are only included if there are data available SECTION 0 Identification, time and position data MiMiMjMj A1bwnbnbnb YYMMJ GGggiw QcLaLaLaLaLa LoLoLoLoLoLo (6QiQt//) SECTION 1 Meteorological and other non-marine data (111QdQx 0ddff 1snTTT 2snTdTdTd OR 29UUU 3P0P0P0P0 4PPPP 5appp SECTION 2 Surface marine data (222QdQx 0snTwTwTw 1PwaPwaHwaHwa ..... ..... SECTION 3 Temperatures, salinity and current (when available) at selected depths 333Qd1Qd2 ..... ..... SECTION 4 Information on engineering and technical parameters including quality control data) 444 (1QpQ2QTwQ4) ..... .....
INTERPRETATION SECTION 0 (Identification, time and position data) MiMiMjMj Always coded as ZZYY A1bwnbnbnb The buoy number or identifier A1bw The WMO Region and sub-region in which the buoy was deployed, eg 62 includes the seas around the UK and to the west and south-west of the British Isles. nbnbnb Type and serial number of the buoy (500 is added to the serial number when the buoy is a drifting buoy) YYMMJ YY Date MM Month J Last digit of the year GGggiw GGgg Time of the observation iw Indicator for source and units of wind speed 0 or 1: Wind speed metres/sec; 3 or 4: Wind speed knots QcLaLaLaLaLa Qc Quadrant of the globe N hemisphere: 7 is degrees West, 1 is degrees East S hemisphere: 5 is degrees West, 3 is degrees East LaLaLaLaLa Latitude (eg 54126 decoded as 54.126 degrees, 54.12/ decoded as 54.12 degrees and 541// as 54.1 degrees) LoLoLoLoLoLo Longitude (eg 132463 decoded as 132.463 degrees, 05621/ decoded as 56.21 degrees, and 1458// as 145.8 degrees (6QiQt//) Quality control indicators (see WMO Manual on Codes)
SECTION 1 (Meteorological and other non-marine data) 111QdQx Quality control indicators for the section 0ddff 0 Indicator dd Wind direction in tens of degrees ff Wind speed in knots or m/s 1snTTT 1 Indicator sn Sign of temperature - 0: positive or zero, 1: negative TTT Dry-bulb temperature in tenths of a degree Celsius 2snTdTdTd 2 Indicator sn Sign of temperature TdTdTd Dew-point temperature in tenths of a degree Celsius OR 29UUU 2 Indicator 9 Relative humidity follows UUU Relative humidity expressed as a percentage: first figure zero except when UUU is 100 percent 3P0P0P0P0 3 Indicator P0P0P0P0 Pressure at station level, in tenths of a millibar, omitting the thousands digit 4PPPP 4 Indicator PPPP Mean sea level pressure, in tenths of a millibar, omitting the thousands digit 5appp 5 Indicator a Characteristic of pressure change ppp Pressure change over last three hours in tenths of a millibar
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Created by MWS: 15th February 1998
Dave Wheeler firstname.lastname@example.org
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