A powerful Arctic cold front will sweep across the Great Lakes today and into the Northeast early Thursday. Expect brief, intense bursts of heavy snowfall and gusty winds. Widespread strong winds will spread from the Northern Plains to the Great Lakes today and reach the Central Appalachians, Mid-Atlantic, and Northeast by Thursday, where some blizzard conditions are expected in the Appalachians. Read More >
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 table does not contain a suitable designator 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 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 no standard format has been established for a particular data type, and 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.
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| C | Cyclone | [TEXT] |
| G | Hydro/Marine | [TEXT] |
| H | Thickness | [TEXT] |
| I | Ice | FM 44 (ICEAN) |
| O | Ozone layer | [TEXT] |
| R | Radar | [TEXT] |
| S | Surface | FM 45 (IAC)/FM 46 (IAC FLEET) |
| U | Upper air | FM 45 (IAC) |
| W | Weather summary | [TEXT] |
| X | Miscellaneous | [TEXT] |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| A | Climatic anomalies | [TEXT] |
| E | Monthly means (upper air) | FM 76 (CLIMAT TEMP SHIP) |
| H | Monthly means (surface) | FM 72 (CLIMAT SHIP) |
| O | Monthly means (ocean areas) | FM 73 (NACLI,CLINP,SPCLI,CLISA,INCLI) |
| S | Monthly means (surface) | FM 71 (CLIMAT) |
| U | Monthly means (upper air) | FM 75 (CLIMAT TEMP) |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| A | Aviation area/GAMET/advisories | FM 53 (ARFOR)/[TEXT] |
| B | Upper winds & temperatures | FM 50 (WINTEM)) |
| C | Aerodrome (VT > 12 hours) | FM 51 (TAF) |
| D | Radiological trajectory dose | FM 57 (RADOF) |
| E | Extended | [TEXT] |
| F | Shipping | FM 46 (IAC FLEET) |
| G | Hydrological | FM 68 (HYFOR) |
| H | Upper air thickness | [TEXT] |
| I | Iceberg | [TEXT] |
| J | Radio warning service (incl IUWDS data) | [TEXT] |
| K | Tropical cyclone advisories | [TEXT] |
| L | Local/area | [TEXT] |
| M | Temperature extremes | [TEXT] |
| O | Guidance | [TEXT] |
| P | Public | [TEXT] |
| Q | Other shipping | [TEXT] |
| R | Aviation route | FM 54 (ROFOR) |
| S | Surface | FM 45 (IAC)/FM 46 (IAC FLEET) |
| T | Aerodrome (VT > 12 hours) | FM 51 (TAF) |
| U | Upper air | FM 45 (IAC) |
| V | Volcanic ash advisories | [TEXT] |
| W | Winter sports | [TEXT] |
| X | Miscellaneous | [TEXT] |
| Z | Shipping area | FM 61 (MAFOR) |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| A | Aviation routine reports | FM 15 (METAR) |
| B | Radar reports (part A) | FM 20 (RADOB) |
| C | Radar reports (part B) | FM 20 (RADOB) |
| D | Radar reports (parts A & B) | FM 20 (RADOB) |
| E | Seismic data | *(SEISMIC) |
| F | Atmospherics reports | FM 81 (SFAZI)/FM 82 (SFLOC)/FM83 (SFAZU) |
| G | Radiological data report | FM 22 (RADREP) |
| I | Intermediate synoptic hour | FM 12 (SYNOP)/FM 13 (SHIP) |
| L | Table driven coded reports | FM ?? (CREX) |
| M | Main synoptic hour | FM 12 (SYNOP)/FM 13 (SHIP) |
| N | Non-standard synoptic hour | FM 12 (SYNOP)/FM 13 (SHIP) |
| O | Oceanographic data | FM 63 (BATHY)/FM 64 (TESAC) FM 65 (WAVEOB)/FM 62 (TRACKOB) |
| P | Special aviation weather reports | FM 16 (SPECI) |
| R | Hydrological (river) reports | FM 67 (HYDRA) |
| S | Drifting buoy reports | FM 18 (DRIFTER) |
| T | Sea ice | [TEXT] |
| U | Snow depth | [TEXT] |
| V | Lake ice | [TEXT] |
| X | Miscellaneous | [TEXT] |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| B | Satellite orbit parameters | [TEXT] |
| C | Satellite cloud interpretations | FM 85 (SAREP) |
| H | Satellite remote upper-air soundings | FM 86 (SATEM) |
| R | Clear radiance obs | FM 87 (SARAD) |
| T | Sea surface temperatures | FM 88 (SATOB) |
| W | Winds & cold temperatures | FM 88 (SATOB) |
| X | Miscellaneous | [TEXT] |
| Y | Radiance balance | FM 88 (SATOB) |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| A | Aircraft reports | FM 41 (CODAR, ICAO (AIREP) |
| D | Aircraft reports | FM 42 (AMDAR)) |
| E | Upper-level pressure,temperature,humidity & wind (Part D) | FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| F | Upper-level pressure,tempeature,humidity & wind (Parts C & D) [National & bilateral option] |
FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| G | Upper-wind (Part B) | FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL) |
| H | Upper-wind (Part C) | FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL) |
| I | Upper-wind (Parts A & B) [National & bilateral option] | FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL) |
| K | Upper-level pressure,temperature,humidity & wind (Part B) | FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| L | Upper-level pressure,temperature,humidity & wind (Part C) | FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| M | Upper-level pressure,temperature,humidity & wind (Parts A & B) [National & bilateral option] |
FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| N | Rocketsonde reports | FM 39 (ROCOB)/FM 40 (ROCOB SHIP) |
| P | Upper-wind (Part A) | FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL) |
| Q | Upper-wind (Part D) | FM 32 (PILOT)/FM 33 (PILOT SHIP)/FM 34 (PILOT MOBIL) |
| R | Aircraft reports | [NATIONAL*] (RECCO) |
| S | Upper-level pressure,temperature,humidify & wind (Part A) | FM 35 (TEMP)/FM 36 (TEMP SHIP)/FM 38 (TEMP MOBIL) |
| T | Aircraft reports | FM 41 (CODAR) |
| X | Miscellaneous | [TEXT] |
| Y | Upper-wind (Parts C & D) [National & bilateral option] | FM 32 (PILOT)/FM 33(PILOT SHIP)/FM 34(PILOT MOBIL) |
| Z | Upper-level pressure,temperature,humidity & wind from a sonde released by carrier balloon or aircraft (Parts A,B,C,D) | FM 37 (TEMP DROP) |
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| * e.g. U.S. national code form for reports from a meteorological reconnaissance flight (RECCO), documented in WMO No. 306, Manual on Codes, Volume II, chapter IV, part F. | ||
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| A | Airmet | [TEXT] |
| C | Tropical cyclone (SIGMET) | [TEXT] |
| E | Tsunami | [TEXT] |
| F | Tornado | [TEXT] |
| G | Hydrological/river flood | [TEXT] |
| H | Marine/coastal flood | [TEXT] |
| O | Other | [TEXT] |
| S | SIGMET | [TEXT] |
| T | Tropicalcyclone (typhoon/hurricane) | [TEXT] |
| U | Severe thunderstorm | [TEXT] |
| V | Volcanic ash clouds (SIGMET) | [TEXT] |
| W | Warnings & weather summary | [TEXT] |
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| T2 | ||
| Designator | Data Type | Code Form (name) |
| G | Hydrological | [TEXT] |
| H | Marine | [TEXT] |
| N | Nuclear emergency response | [TEXT] |
| O | METNO/WIFMA | [TEXT] |
| P | Product generation delay | [TEXT] |
| T | TEST MSG [System related] | [TEXT] |
| W | Warning related and/or cancellation | [TEXT] |
