File Format of Meteorological observation data

File Format of Maritime meteorological data

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Maritime meteorological data layout is identical to the International Maritime Meteorological Tape (IMMT) [VERSION IMMT-1]. All the description of WMO code tables used in the format are contained in the CD-ROM.

Element name Start Position Field Type Description of Field

TEMP INDICATOR 1 I1 IMMT format with temperature in tenths of degrees Celsius: '3'.

YEAR 2 I4 Year in UTC

MONTH 6 I2 Month in UTC

DAY 8 I2 Day in UTC

OBSERVATION TIME 10 I2 Nearest whole hour in UTC.

QUADRANT OF THE GLOBE 12 I1 Quadrant of the Globe, WMO code table 3333: ' 1 ' for North Latitude and East Longitude; ' 3 ' for South Latitude and East Longitude; ' 5 ' for South Latitude and West Longitude; ' 7 ' for North Latitude and West Longitude.

LATITUDE 13 I3 Latitude in tenths of degree.

LONGITUDE 16 I4 Longitude in tenths of degree.

CLOUD HEIGHT AND VISIBILITY INDICATOR 20 I1 ' 0 'for cloud height and visibility estimated; ' 1 ' for cloud height measured, visibility estimated; ' 2 ' for cloud height and visibility measured; ' 3 ' for cloud height estimated, visibility measured.

CLOUD HEIGHT 21 I1 height of the base of the lowest cloud, WMO code table 1600.

VISIBILITY 22 I2 Visibility, WMO code table 4377.

CLOUD AMOUNT 24 I1 Total cloud cover in oktas, WMO code table 2700.

WIND DIRECTION 25 I2 True wind direction in tens of degrees, WMO code table 0877.

WIND SPEED INDICATOR 27 I1 The wind speed was measured with an anemometer in knots: ' 4 '.

WIND SPEED 28 I2 True wind speed in knots.

TEMPERATURE INDICATOR 30 I1 The sign of the air temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.

AIR TEMPERATURE 31 I3 Air temperature in tenths of degrees Celsius.

DEW POINT TEMPERATURE INDICATOR 34 I1 The sign of the dew point temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.

DEW POINT TEMPERATURE 35 I3 Dew point temperature in tenths of degrees Celsius.

PRESSURE 38 I4 Air pressure in tenths of hectopascals.

PRESENT WEATHER 42 I2 Present weather, WMO code table 4677.

PAST WEATHER 1 44 I1 Past weather, WMO code table 4561.

PAST WEATHER 2 45 I1 Past weather, WMO code table 4561.

LOWEST CLOUD AMOUNT 46 I1 Amount of lowest clouds in oktas, WMO code table 2700.

LOW CLOUD TYPE 47 I1 WMO code table 0513.

MIDDLE CLOUD TYPE 48 I1 WMO code table 0515.

HIGH CLOUD TYPE 49 I1 WMO code table 0509.

SEA SURFACE TEMPERATURE INDICATOR 50 I1 The sign of the sea surface temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.

SEA SURFACE TEMPERATURE 51 I3 Sea surface temperature in tenths of degrees Celsius.

SEA SURFACE TEMPERATURE MEASUREMENT 54 I1 Indicator for sea surface temperature measurement:' 0 ' for bucket thermometer; ' 1 ' for condenser inlet.

WAVE MEASUREMENT 55 I1 ' 0 ' for wind wave and swell estimated.

WIND WAVE PERIOD 56 I2 Period of wind waves in seconds.

WIND WAVE HEIGHT 58 I2 Height of wind waves in units of 0.5 m.

SWELL DIRECTION 60 I2 Direction of predominant swell waves in tens of degrees, WMO code table 0877.

SWELL PERIOD 62 I2 Period of predominant swell waves in seconds.

SWELL HEIGHT 64 I2 Height of predominant swell waves in unit of 0.5 m.

ICE ACCRETION 66 I1 Cause of ice accretion on ship, WMO code table 1751.

ICE THICKNESS 67 I2 Thickness of ice accretion on ship in centimeters.

ICE ACCRETION RATE 69 I1 Rate of ice accretion on ship, WMO code table 3551.

OBSERVATION SOURCE 70 I1 ' 1 ' for national logbook.

PLATFORM 71 I1 ' 1 ' for selected ship.

CALL SIGN 72 A7 Ship's call sign(listed in Table).

COUNTRY 79 I2 '17' for Japan.

QUALITY CONTROL INDICATOR 82 I1 '6' for manual and automated quality control (intensive).

WEATHER DATA INDICATOR 83 I1 '1' for manual.

PRECIPITATION INDICATOR 84 I1 Indicator for inclusion or omission of precipitation data, WMO code table 1819.

PRECIPITATION AMOUNT 85 I3 Amount of precipitation, WMO code table 3590.

PRECIPITATION DURATION 88 I1 Duration of period of reference for amount of precipitation, WMO code table 4019.

PRESSURE TENDENCY CHARACTERISTIC 93 I1 Characteristic of pressure tendency during the three hours preceding the time of observation, WMO code table 0200.

PRESSURE TENDENCY AMOUNT 94 I3 Amount of pressure tendency during the three hours preceding the time of observation in tenths of hectopascal.

SHIP COURSE 97 I1 True direction of resultant displacement of the ship during three hours preceding the time of observation, WMO code table 0700.

SHIP SPEED 98 I1 Ship's average speed made good during three hours preceding the time of observation, WMO code table 4451.

2ND SWELL DIRECTION 99 I2 Direction of secondary swell waves in tens of degrees.

2ND SWELL PERIOD 101 I2 Period of secondary swell waves in seconds.

2ND SWELL HEIGHT 103 I2 Height of secondary swell waves in units of 0.5 m.

SEA ICE CONCENTRATION 105 I1 Concentration or arrangement of sea ice, WMO code table 0639.

SEA ICE DEVELOPMENT 106 I1 Stage of development of sea ice, WMO code table 3739.

LAND ORIGIN ICE 107 I1 Ice of land origin, WMO code table 0439.

ICE EDGE BEARING 108 I1 True bearing of principal sea ice edge, WMO code table 0739.

ICE CONDITION 109 I1 Present sea ice situation and trend of conditions over preceding three hours, WMO code table 5239.

FM 13 VERSION 110 I1 '8' for FM 13-X.

IMMT VERSION 111 I1 '1' for IMMT-1.

CLOUD HEIGHT QC INDICATOR 112 I1 '1' -- quality control has been performed; element appears to be correct.

VISIBILITY QC 113 I1 idem.

CLOUD AMOUNT AND TYPE QC 114 I1 idem.

WIND DIRECTION QC 115 I1 idem.

WIND SPEED QC 116 I1 idem.

AIR TEMPERATURE QC 117 I1 idem.

DEW POINT QC 118 I1 idem.

AIR PRESSURE QC 119 I1 idem.

WEATHER QC 120 I1 idem.

SEA SURFACE TEMPERATURE QC 121 I1 idem.

WIND WAVE PERIOD QC 122 I1 idem.

WIND WAVE HEIGHT QC 123 I1 idem.

SWELL QC 124 I1 idem.

PRECIPITATION QC 125 I1 idem.

PRESSURE TENDENCY CHARACTERISTIC QC 126 I1 idem.

PRESSURE TENDENCY AMOUNT 127 I1 idem.

SHIP DIRECTION QC 128 I1 idem.

SHIP SPEED QC 129 I1 idem.

SHIP POSITION QC 130 I1 idem.

Element name	Start Position	Field Type	Description of Field
TEMP INDICATOR	1	I1	IMMT format with temperature in tenths of degrees Celsius: '3'.
YEAR	2	I4	Year in UTC
MONTH	6	I2	Month in UTC
DAY	8	I2	Day in UTC
OBSERVATION TIME	10	I2	Nearest whole hour in UTC.
QUADRANT OF THE GLOBE	12	I1	Quadrant of the Globe, WMO code table 3333: ' 1 ' for North Latitude and East Longitude; ' 3 ' for South Latitude and East Longitude; ' 5 ' for South Latitude and West Longitude; ' 7 ' for North Latitude and West Longitude.
LATITUDE	13	I3	Latitude in tenths of degree.
LONGITUDE	16	I4	Longitude in tenths of degree.
CLOUD HEIGHT AND VISIBILITY INDICATOR	20	I1	' 0 'for cloud height and visibility estimated; ' 1 ' for cloud height measured, visibility estimated; ' 2 ' for cloud height and visibility measured; ' 3 ' for cloud height estimated, visibility measured.
CLOUD HEIGHT	21	I1	height of the base of the lowest cloud, WMO code table 1600.
VISIBILITY	22	I2	Visibility, WMO code table 4377.
CLOUD AMOUNT	24	I1	Total cloud cover in oktas, WMO code table 2700.
WIND DIRECTION	25	I2	True wind direction in tens of degrees, WMO code table 0877.
WIND SPEED INDICATOR	27	I1	The wind speed was measured with an anemometer in knots: ' 4 '.
WIND SPEED	28	I2	True wind speed in knots.
TEMPERATURE INDICATOR	30	I1	The sign of the air temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.
AIR TEMPERATURE	31	I3	Air temperature in tenths of degrees Celsius.
DEW POINT TEMPERATURE INDICATOR	34	I1	The sign of the dew point temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.
DEW POINT TEMPERATURE	35	I3	Dew point temperature in tenths of degrees Celsius.
PRESSURE	38	I4	Air pressure in tenths of hectopascals.
PRESENT WEATHER	42	I2	Present weather, WMO code table 4677.
PAST WEATHER 1	44	I1	Past weather, WMO code table 4561.
PAST WEATHER 2	45	I1	Past weather, WMO code table 4561.
LOWEST CLOUD AMOUNT	46	I1	Amount of lowest clouds in oktas, WMO code table 2700.
LOW CLOUD TYPE	47	I1	WMO code table 0513.
MIDDLE CLOUD TYPE	48	I1	WMO code table 0515.
HIGH CLOUD TYPE	49	I1	WMO code table 0509.
SEA SURFACE TEMPERATURE INDICATOR	50	I1	The sign of the sea surface temperature: ' 0 ' for the positive or zero temperatures; ' 1 ' for negative.
SEA SURFACE TEMPERATURE	51	I3	Sea surface temperature in tenths of degrees Celsius.
SEA SURFACE TEMPERATURE MEASUREMENT	54	I1	Indicator for sea surface temperature measurement:' 0 ' for bucket thermometer; ' 1 ' for condenser inlet.
WAVE MEASUREMENT	55	I1	' 0 ' for wind wave and swell estimated.
WIND WAVE PERIOD	56	I2	Period of wind waves in seconds.
WIND WAVE HEIGHT	58	I2	Height of wind waves in units of 0.5 m.
SWELL DIRECTION	60	I2	Direction of predominant swell waves in tens of degrees, WMO code table 0877.
SWELL PERIOD	62	I2	Period of predominant swell waves in seconds.
SWELL HEIGHT	64	I2	Height of predominant swell waves in unit of 0.5 m.
ICE ACCRETION	66	I1	Cause of ice accretion on ship, WMO code table 1751.
ICE THICKNESS	67	I2	Thickness of ice accretion on ship in centimeters.
ICE ACCRETION RATE	69	I1	Rate of ice accretion on ship, WMO code table 3551.
OBSERVATION SOURCE	70	I1	' 1 ' for national logbook.
PLATFORM	71	I1	' 1 ' for selected ship.
CALL SIGN	72	A7	Ship's call sign(listed in Table).
COUNTRY	79	I2	'17' for Japan.
QUALITY CONTROL INDICATOR	82	I1	'6' for manual and automated quality control (intensive).
WEATHER DATA INDICATOR	83	I1	'1' for manual.
PRECIPITATION INDICATOR	84	I1	Indicator for inclusion or omission of precipitation data, WMO code table 1819.
PRECIPITATION AMOUNT	85	I3	Amount of precipitation, WMO code table 3590.
PRECIPITATION DURATION	88	I1	Duration of period of reference for amount of precipitation, WMO code table 4019.
PRESSURE TENDENCY CHARACTERISTIC	93	I1	Characteristic of pressure tendency during the three hours preceding the time of observation, WMO code table 0200.
PRESSURE TENDENCY AMOUNT	94	I3	Amount of pressure tendency during the three hours preceding the time of observation in tenths of hectopascal.
SHIP COURSE	97	I1	True direction of resultant displacement of the ship during three hours preceding the time of observation, WMO code table 0700.
SHIP SPEED	98	I1	Ship's average speed made good during three hours preceding the time of observation, WMO code table 4451.
2ND SWELL DIRECTION	99	I2	Direction of secondary swell waves in tens of degrees.
2ND SWELL PERIOD	101	I2	Period of secondary swell waves in seconds.
2ND SWELL HEIGHT	103	I2	Height of secondary swell waves in units of 0.5 m.
SEA ICE CONCENTRATION	105	I1	Concentration or arrangement of sea ice, WMO code table 0639.
SEA ICE DEVELOPMENT	106	I1	Stage of development of sea ice, WMO code table 3739.
LAND ORIGIN ICE	107	I1	Ice of land origin, WMO code table 0439.
ICE EDGE BEARING	108	I1	True bearing of principal sea ice edge, WMO code table 0739.
ICE CONDITION	109	I1	Present sea ice situation and trend of conditions over preceding three hours, WMO code table 5239.
FM 13 VERSION	110	I1	'8' for FM 13-X.
IMMT VERSION	111	I1	'1' for IMMT-1.
CLOUD HEIGHT QC INDICATOR	112	I1	'1' -- quality control has been performed; element appears to be correct.
VISIBILITY QC	113	I1	idem.
CLOUD AMOUNT AND TYPE QC	114	I1	idem.
WIND DIRECTION QC	115	I1	idem.
WIND SPEED QC	116	I1	idem.
AIR TEMPERATURE QC	117	I1	idem.
DEW POINT QC	118	I1	idem.
AIR PRESSURE QC	119	I1	idem.
WEATHER QC	120	I1	idem.
SEA SURFACE TEMPERATURE QC	121	I1	idem.
WIND WAVE PERIOD QC	122	I1	idem.
WIND WAVE HEIGHT QC	123	I1	idem.
SWELL QC	124	I1	idem.
PRECIPITATION QC	125	I1	idem.
PRESSURE TENDENCY CHARACTERISTIC QC	126	I1	idem.
PRESSURE TENDENCY AMOUNT	127	I1	idem.
SHIP DIRECTION QC	128	I1	idem.
SHIP SPEED QC	129	I1	idem.
SHIP POSITION QC	130	I1	idem.

Ship code.
Ship Name CALL SIGN

Kofu Maru JDWH

Ryofu Maru JGQH

Keifu Maru JPBN

Chofu Maru JCCX

Seifu Maru JIVB

Ship Name	CALL SIGN
Kofu Maru	JDWH
Ryofu Maru	JGQH
Keifu Maru	JPBN
Chofu Maru	JCCX
Seifu Maru	JIVB