Draft (November 9, 2000) layout for the international maritime meteorological tape (immt)




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Annex IV


DRAFT

(November 9, 2000)

LAYOUT FOR THE INTERNATIONAL MARITIME METEOROLOGICAL tape (immt)

[version immt-2]
Element Character Code Element Coding procedure

Number Number
1 1 iT Format/temperature indicator 3=IMMT format with temperatures in tenths of °C

4=IMMT format with temperatures in halves of °C

5=IMMT format with temperatures in whole °C
2 2-5 AAAA Year UTC Four digits
3 6-7 MM Month UTC 01 - 12 January to December
4 8-9 YY Day UTC 01 - 31
5 10-11 GG Time of observation Nearest whole hour UTC, WMO specifications
6 12 Qc Quadrant of the globe WMO code table 3333
7 13-15 LaLaLa Latitude Tenths of degrees, WMO specifications
8 16-19 LoLoLoLo Longitude Tenths of degrees
9 20 Cloud height (h) and visibility (VV) 0 - h and VV estimated

measuring indicator 1 - h measured, VV estimated

2 - h and VV measured

3 - h estimated, VV measured


10 21 h Height of clouds WMO code table 1600
11 22-23 VV Visibility WMO code table 4377
12 24 N Cloud amount Oktas, WMO code table 2700; show 9 where applicable
13 25-26 dd True wind direction Tens of degrees, WMO code table 0877; show 00 or 99

where applicable


14 27 iw Indicator for wind speed WMO code table 1855
15 28-29 ff Wind speed Tens and units of knots or meters per second, hundreds

omitted; values in excess of 99 knots are to be indicated

in units of meters per second and Iw encoded accordingly;

the method of estimation or measurement and the units

used (knots or meters per second) are indicated in

element 14


16 30 sn Sign of temperature WMO code table 3845
17 31-33 TTT Air temperature Tenths of degrees Celsius
18 34 st Sign of dew-point temperature 0 - positive or zero measured dew-point temperature

1 - negative measured dew-point temperature

2 - iced measured dew-point temperature

5 - positive or zero computed dew-point temperature

6 - negative computed dew-point temperature

7 - iced computed dew-point temperature


19 35-37 TdTdTd Dew-point temperature Tenths of degrees Celsius
20 38-41 PPPP Air pressure Tenths of hectopascals

Element Character Code Element Coding procedure

Number Number
21 42-43 ww Present weather WMO code table 4677
22 44 W1 Past weather WMO code table 4561
23 45 W2 Past weather WMO code table 4561
24 46 Nh Amount of lowest clouds As reported for CL or, if no CL cloud is present, for CM,

in oktas; WMO code table 2700


25 47 CL Genus of CL clouds WMO code table 0513
26 48 CM Genus of CM clouds WMO code table 0515
27 49 CH Genus of CH clouds WMO code table 0509
28 50 sn Sign of sea-surface temperature WMO code table 3845
29 51-53 TwTwTw Sea surface temperature Tenth of degrees Celsius
30 54 Indicator for sea-surface 0 - Bucket thermometer

temperature measurement 1 - Condenser inlet

2 - Trailing thermistor

3 - Hull contact sensor

4 - “Through hull” sensor

5 - Radiation thermometer

6 - Bait tanks thermometer

7 - Others


31 55 Indicator for wave measurement 0 - Wind sea and swell estimated

Shipborne 1 - Wind sea and swell measured

wave 2 - Mixed wave measured, swell estimated

recorder 3 - Other combinations measured and

estimated

4 - Wind sea and swell measured

Buoy 5 - Mixed wave measured, swell estimated

6 - Other combinations measured and

estimated

7 - Wind sea and swell measured

Other 8 - Mixed wave measured, swell estimated

measurement 9 - Other combinations measured and

system estimated
32 56-57 PwPw Period of wind waves or of Whole seconds; show 99 where applicable in

measured waves accordance with Note (3) under specification of



PwPw in the Manual on Codes
33 58-59 HwHw Height of wind waves or of Half-meter values. Examples: Calm or less than 1/4m

measured waves to be encoded 00; 31/2m to be encoded 07; 7m to be

encoded 14; 111/2m to be encoded 23
34 60-61 dw1dw1 Direction of predominant Tens of degrees, WMO code table 0877; encoded 00

swell waves or 99 where applicable.

Blanks = No observation of waves attempted
35 62-63 Pw1Pw1 Period of predominant Whole seconds; encoded 99 where applicable

swell waves (see under element 32)


36 64-65 Hw1Hw1 Height of predominant swell waves Half-meter values (see under element 33)
37 66 Is Ice accretion on ships WMO code table 1751
38 67-68 EsEs Thickness of ice accretion In centimeters
39 69 Rs Rate of ice accretion WMO code table 3551
40 70 Source of observation 0 - Unknown

1 - Logbook National

2 - Telecommunication channels

3 - Publications

4 - Logbook International

5 - Telecommunication channels data exchange

6 – Publications

Element Character Code Element Coding procedure

Number Number
41 71 Observation platform 0 - unknown

1 - Selected ship

2 - Supplementary ship

3 - Auxiliary ship

4 - Automated station/data buoy

5 - Fixed sea station

6 - Coastal station

7 - Aircraft

8 - Satellite

9 - Others ....


42 72-78 Ship identifier Ship’s call sign or other identifier encoded as follows:

7 characters call sign Columns 72–78

6 characters call sign Columns 72–77

5 characters call sign Columns 72–76

4 characters call sign Columns 72–75

3 characters call sign Columns 72–74

43 79-80 Country which has recruited the ship According to the two-character alphabetical codes assigned by the

International Organization for Standardization (ISO)


44 81 National use
45 82 Quality control indicator 0 - No quality control (QC)

1 - Manual QC only

2 - Automated QC only (no time-sequence checks)

3 - Automated QC only (inc. time sequence checks)

4 - Manual and automated QC (superficial; no automated

time-sequence checks)

5 - Manual and automated QC (superficial; including

time-sequence checks)

6 - Manual and automated QC (intensive, including

automated time-sequence checks)

7 & 8 - Not used

9 - National system of QC (information to be

furnished to WMO)
46 83 ix Weather data indicator 1 - Manual

4 - Automatic If present and past weather data included

Code tables 4677 and 4561 used

7 - Automatic If present and past weather data included

Code tables 4680 and 4531 used
47 84 iR Indicator for inclusion or omission WMO code table 1819

of precipitation data


48 85-87 RRR Amount of precipitation which has WMO code table 3590

fallen during the period preceding

the time of observation, as indicated

by tR


49 88 tR Duration of period of reference for WMO code table 4019

amount of precipitation, ending at

the time of the report
50 89 sw Sign of wet-bulb temperature 0 - positive or zero measured wet-bulb temperature

1 - negative measured wet-bulb temperature

2 - iced measured wet-bulb temperature

5 - positive or zero computed wet-bulb temperature

6 - negative computed wet-bulb temperature

7 - iced computed wet-bulb temperature


51 90-92 TbTbTb Wet-bulb temperature In tenths of degree Celsius, sign given by element 50
52 93 a Characteristic of pressure tendency WMO code table 0200

during the three hours preceding

the time of observation

Element Character Code Element Coding procedure

Number Number
53 94-96 ppp Amount of pressure tendency at In tenths of hectopascal

station level during the three hours

preceding the time of observation
54 97 Ds True direction of resultant WMO code table 0700

displacement of the ship during

three hours preceding the time of

observation


55 98 vs Ship’s average speed made good WMO code table 4451

during the three hours preceding

the time of observation
56 99-100 dw2dw2 Direction of secondary swell waves Tens of degrees, WMO code table 0877;

encoded 00 or 99 where applicable.

Blanks = No observation of waves attempted
57 101-102 Pw2Pw2 Period of secondary swell waves Whole seconds; encoded 99 where applicable

(see under element 32)


58 103-104 Hw2Hw2 Height of secondary swell waves Half-meter values (see under element 33)
59 105 ci Concentration or arrangement WMO code table 0639

of sea ice


60 106 Si Stage of development WMO code table 3739
61 107 bi Ice of land origin WMO code table 0439
62 108 Di True bearing of principal ice edge WMO code table 0739
63 109 zi Present ice situation and trend of WMO code table 5239

conditions over preceding three hours


64 110 FM 13 code version 0 = previous to FM 24-V

1 = FM 24-V

2 = FM 24-VI Ext.

3 = FM 13-VII

4 = FM 13-VIII

5 = FM 13-VIII Ext.

6 = FM 13-IX

7 = FM 13-IX Ext.

8 = FM 13-X, etc.
65 111 IMMT version 0 = previous IMMT

1 = IMMT-1 (this version)

2 = IMMT-2 (next version)

3 = IMMT-3, etc.


66 112 Q1 Quality control indicator for (h) 0 - no quality control (QC) has been performed

in this element

1 - QC has been performed; element appears to be correct

2 - QC has been performed; element appears

to be inconsistent with other elements

3 - QC has been performed; element appears to be doubtful

4 - QC has been performed; element appears to be erroneous

5 - The value has been changed as a result of QC

6 - 8 Reserve

9 - The value of the element missing


67 113 Q2 QC indicator for (VV) - idem -
68 114 Q3 QC indicator for (clouds: - idem -

elements 12, 24–27)


69 115 Q4 QC indicator for (dd) - idem -
70 116 Q5 QC indicator for (ff) - idem -

Element Character Code Element Coding procedure

Number Number
71 117 Q6 QC indicator for (TTT) - idem -
72 118 Q7 QC indicator for (TdTdTd) - idem -
73 119 Q8 QC indicator for (PPPP) - idem -
74 120 Q9 QC indicator for (weather: - idem -

elements 21–23)


75 121 Q10 QC indicator for (TwTwTw) - idem -
76 122 Q11 QC indicator for (PwPw) - idem -
77 123 Q12 QC indicator for (HwHw) - idem -
78 124 Q13 QC indicator for (swell: elements - idem -

34–36, 56–58)


79 125 Q14 QC indicator for (iRRRRtR) - idem -
80 126 Q15 QC indicator for (a) - idem -
81 127 Q16 QC indicator for (ppp) - idem -
82 128 Q17 QC indicator for (Ds) - idem -
83 129 Q18 QC indicator for (vs) - idem -
84 130 Q19 QC indicator for (TbTbTb) - idem -
85 131 Q20 QC indicator for ships’ position - idem -

Additional requirements for the VOSCLIM Project


86 132-134 SHD Ship’s heading in degrees true at time (000-360); e.g. 360 = North

of observation 000 = No Movement

090 = East


87 135-136 ISS Instantaneous ship’s speed in knots at time Round to nearest whole knot (00-99)

of observation


88 137-138 SLL Maximum height in meters of deck cargo above (00-99); report to nearest whole meter

Summer maximum load line.
89 139-141 hh Departure of reference level (Summer maximum position 139; blank = positive

load line) from actual sea level. Consider the (dash) - = negative

difference positive when the Summer maximum

load line is above the level of the sea and negative positions 140-141; (00-99) is the

if below the water line. difference to the nearest whole meter

between the Summer maximum load line

and the sea level.

91 142-144 RWD Relative wind direction in degrees off the bow Relative wind direction; e.g. 000 = no apparent relative wind speed (calm conditions on deck). Reported direction for relative wind = 001-360

degrees in a clockwise direction off the

bow of the ship. When directly on the bow,

RWD = 360.

90 145-147 f ‘f ‘ Relative wind speed reported in units indicated by Reported in either whole knots or whole

iw (knots or m/s) meters per second (e.g. 010 knots or 005

m/s). Units established by iw as indicated

in Character Number 27.

Note: Since the relative wind speed can be greater than the true wind speed, e.g. iw indicates knots and ff = 98, the relative wind speed may be 101 knots, therefore three positions must be allocated since iw cannot be adjusted and the relative wind speed converted to meters per second as is done in element 15.


Note: Most of the codes (groups of letters) in the IMMT format with the exception of those added for the VOSCLIM project are defined in the Manual on Codes (WMO-No. 306) as they basically mirror the code groups used in FM 13-X Ship code. Because CBS was not persuaded to expand the FM 13-X Ship code for the VOSCLIM project the additional observed elements (selected codes) will not appear in WMO Manual on Codes (Pub. 306). Therefore an effort was made to select unique codes (groups of letters) not defined in WMO Pub. 306 for the elements added to the IMMT-2 format version modified for the VOSCLIM project. This was deliberately done to try and prevent a difference in meaning for a given code group (identical symbolic letters) in Pub 306 versus that in IMMT. Presumably none of the Character Code formats will be altered in the future by CBS



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