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Excerpt taken from: WMO No. 386 Manual on the Global Telecommunication System
Part II - Operational Procedures for the GTS
ATTACHMENT II–5 - DATA DESIGNATORS T1T2A1A2ii IN ABBREVIATED HEADINGS

TABLE B1

Data type designator T2 (when T1 = A,C,F,N,S,T,U or W)

Instructions for the proper application of the data type designators

(1)	The designators specified in this table should be used to the greatest extent possible to indicate the type of data contained within the body of the bulletin.
(2)	When the tables does not contain a suitable deisgnator for the data type, an alphabetic designator which is not assigned in the table should be introduced and the WMO Secretariat notified.
(3)	This table includes only the FM number and code name for an individual code form. The Roman numeral identifying the latest version has been omitted to reduce clutter. In all cases the latest version of a code is implied. Refer to WMO-No. 306 - Manual on Codes for the complete code name (including the version) of any numbered code. In those few instances where a numbered code does not exist, a reference and the common name is given: e.g. [ICAO] (AIREP). An explanatory note may be appended to an individual table if necessary.
(4)	In the event that no standard format has been established for a particular data type, and where there is a recommended format, that format is given in square brackets under the column labeled Code form (e.g. [TEXT]). This is a character code in free form - International Alphabet No. 2 (Attachment II–1) or International Alphabet No. 5 (Attachment II–2) will be used.

T1 = A - Analyses

T1	T2	T2 - Data Type	Code Form
A	C	Cyclone	[TEXT]
A	G	Hydrological/Marine	[TEXT]
A	H	Thickness	[TEXT]
A	I	Ice	FM 44 (ICEAN)
A	O	Ozone layer	[TEXT]
A	R	Radar	[TEXT]
A	S	Surface	FM 45 (IAC)/FM 46 (IAC FLEET)
A	U	Upper air	FM 45 (IAC)
A	W	Weather Summary	[TEXT]
A	X	Miscellaneous	[TEXT]

T1 = C - Climatic data

T1	T2	T2 - Data Type	Code Form
C	A	Climatic anomalies	[TEXT]
C	E	Monthly means (upper air)	FM 76 (CLIMAT TEMP SHIP)
C	H	Monthly means (surface)	FM 72 (CLIMAT SHIP)
C	O	Monthly means (ocean areas)	FM 73 (NACLI,CLINP,SPCLI,CLISA,INCLI)
C	S	Monthly means (surface)	FM 71 (CLIMAT)
C	U	Monthly means (upper air)	FM 75 (CLIMAT TEMP)

T1 = F = Forecast

T1	T2	T2 - Data Type	Code Form
F	A	Aviation area /GAMET/advisories	FM 53 (ARFOR)/[TEXT]
F	B	Upper winds and temperatures	FM 50 (WINTEM)
F	C	Aerodrome (VT < 12 hours)	FM 51 (TAF)
F	D	Radiological trajectory dose	FM 57 (RADOF)
F	E	Extended	[TEXT]
F	F	Shipping	FM 46 (IAC FLEET)
F	G	Hydrological	FM 68 (HYFOR)
F	H	Upper air thickness	[TEXT]
F	I	Iceberg	[TEXT]
F	J	Radio warning service (including IUWDS data)	[TEXT]
F	K	Tropical cyclone advisories	[TEXT]
F	L	Local/Area	[TEXT]
F	M	Temperature extremes	[TEXT]
F	O	Guidance	[TEXT]
F	P	Public	[TEXT]
F	Q	Other shipping	[TEXT]
F	R	Aviation route	FM 54 (ROFOR)
F	S	Surface	FM 45 (IAC)/FM 46 (IAC FLEET)
F	T	Aerodrome (VT >= 12 hours)	FM 51 (TAF)
F	U	Upper air	FM 45 (IAC)
F	V	Volcanic ash advisories	[TEXT]
F	W	Winter sports	[TEXT]
F	X	Miscellaneous	[TEXT]
F	Z	Shipping area	FM 61 (MAFOR)

T1 = N- Notices

T1	T2	T2 - Data Type	Code Form
N	G	Hydrological	[TEXT]
N	H	Marine	[TEXT]
N	N	Nuclear emergency response	[TEXT]
N	O	METNO/WIFMA	[TEXT]
N	P	Product generation delay	[TEXT]
N	T	TEST MSG [System related]	[TEXT]
N	W	Warning related and/or cancellation	[TEXT]

T1 = S - Surface data

T1	T2	T2 - Data Type	Code Form
S	A	Aviation routine reports	FM 15 (METAR)
S	B	Radar reports (Part A)	FM 20 (RADOB)
S	C	Radar reports (Part B)	FM 20 (RADOB)
S	D	Radar reports (Parts A & B)	FM 20 (RADOB)
S	E	Seismic data	*(SEISMIC)
S	F	Atmospherics reports	FM 81 (SFAZI)/FM 82 (SFLOC)/FM 83 (SFAZU)
S	G	Radiological data report	FM 22 (RADREP)
S	I	Intermediate synoptic hour	FM 12 (SYNOP)/FM 13 (SHIP)
S	L	-	-
S	M	Main synoptic hour	FM 12 (SYNOP)/FM 13 (SHIP)
S	N	Non-standard synoptic hour	FM 12 (SYNOP)/FM 13 (SHIP)
S	O	Oceanographic data	FM 63 (BATHY)/FM 64 (TESAC)/FM 62 (TRACKOB)
S	P	Special aviation weather reports	FM 16 (SPECI)
S	R	Hydrological (river) reports	FM 67 (HYDRA)
S	S	Drifting buoy reports	FM 18 (BUOY)
S	T	Sea Ice	[TEXT]
S	U	Snow depth	[TEXT]
S	V	Lake ice	[TEXT]
S	X	Miscellaneous	[TEXT]
S	W	Wave information	FM 65 (WAVEOB)
S	Z	Sea level data and deep-ocean tsunami data	[any alphanumeric format]
S	Y	Seismic wave form data	[any format]

T1 = T - Satellite data

T1	T2	T2 - Data Type	Code Form
T	B	Satellite orbit parameters	[TEXT]
T	C	Satellite cloud interpretations	FM 85 (SAREP)
T	H	Satellite remote upper air soundings	FM 86 (SATEM)
T	R	Clear radiance observations	FM 87 (SARAD)
T	T	Sea surface temperatures	FM 88 (SATOB)
T	W	Winds and cloud temperatures	FM 88 (SATOB)
T	X	Miscellaneous	[TEXT]

T1 = U - Upper air data

T1	T2	T2 - Data Type	Code Form
U	L	Upper level pressure, temperature, humidity and wind (Part C)	FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL)
U	M	Upper level pressure, temperature, humidity and wind (Parts A and B) [National and bilateral option]	FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL)
U	N	Rocketsonde reports	FM 39 (ROCOB)/FM 40 (ROCOB SHIP)
U	P	Upper wind (Part A)	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	Q	Upper wind (Part D)	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	R	Aircraft report	[NATIONAL**] (RECCO)
U	S	Upper level pressure, temperature, humidity and wind (Part A)	FM 35 (TEMP)/FM 36 (TEMP SHIP)FM 38 (TEMP MOBIL)
U	T	Aircraft report	FM 41 (CODAR)
U	X	Miscellaneous	[TEXT]
U	Y	Upper wind (Parts C and D) [National and bilateral option]	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	Z	Upper level pressure, temperature, humidity and wind from a sonde released by carrier balloon or aircraft (Parts A, B, C, D)	FM 37 (TEMP DROP)
U	A	Aircraft reports	FM 41 (CODAR), ICAO (AIREP)
U	D	Aircraft reports	FM 42 (AMDAR)
U	E	Upper level pressure, temperature, humidity and wind (Part D)	FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL)
U	F	Upper level pressure, temperature, humidity and wind (Parts C and D) [National and bilateral option]	FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL)
U	G	Upper wind (Part B)	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	H	Upper wind (Part C)	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	I	Upper wind (Parts A and B) [National and bilateral option]	FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL)
U	K	Upper level pressure, temperature, humidity and wind(Part B)	FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL)

T1 = W - Warnings

T1	T2	T2 - Data Type	Code Form
W	A	AIRMET	[TEXT]
W	C	Tropical cyclone (SIGMET)	[TEXT]
W	E	Tsunami	[TEXT]
W	F	Tornado	[TEXT]
W	G	Hydrological/River flood	[TEXT]
W	H	Marine/Coastal flood	[TEXT]
W	O	Other	[TEXT]
W	S	SIGMET	[TEXT]
W	T	Tropical cyclone (Typhoon/Hurricane)	[TEXT]
W	U	Severe thunderstorm	[TEXT]
W	V	Volcanic ash clouds (SIGMET)	[TEXT]
W	W	Warnings and weather summary	[TEXT]

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* The international seismic code is documented in the Manual on Codes (WMO-No. 306), Volume I, Attachment I.
** For example, United States national code form for reports from a meteorological reconnaissance flight (RECCO), is documented in the Manual on Codes (WMO-No. 306), Volume II, Chapter IV, Part F.