Table C7
| Explanation of Data Designators T1T2A1A2ii CCCC |
| TABLE C7 Data type designator A1 (when T1 = K) |
| Instructions for the proper application of the level designators |
| (1) | T1T2 = SZ is allocated to sea level data and deep-ocean tsunami data in any alphanumeric form, including CREX. |
| T1 | = | K | - | CREX |
| T2 | = | F | - | Surface/Sea Level |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | F | A | Surface area forecast (e.g. airways) | |||
| K | F | D | Radiological forecast | RADOF | ||
| K | F | M | Surface forecasts (eg MOS) | |||
| K | F | O | Maritime forecast | MAFOR | ||
| K | F | P | Forecast amendments (airways) | |||
| K | F | R | Hydrologic forecast | HYFOR | ||
| K | F | S | Forecast amendments (TAF) | |||
| K | F | T | Aerodrome forecast (TAF) | |||
| K | F | X | Other surface forecasts |
| T1 | = | K | - | CREX |
| T2 | = | O | - | Oceanographic/limnographic (water properties) |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | O | B | Buoy observations | BUOY | 001/025 | |
| K | O | I | Sea ice | |||
| K | O | P | Sub-surface profiling floats | TESAC | 031/004 | |
| K | O | R | Sea surface observations | TRACKOB | 031/001 | |
| K | O | S | Sea surface and below soundings | BATHY, TESAC | 031/005 | |
| K | O | T | Sea surface temperature | |||
| K | O | W | Sea surface waves | WAVEOB | 031/002 | |
| K | O | X | Other sea environmental | WAVEOB | 031/002 |
| T1 | = | K | - | CREX |
| T2 | = | P | - |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | P | I | Sea ice | |||
| K | P | S | Sea surface and below soundings | |||
| K | P | T | Sea surface temperature | |||
| K | P | W | Sea surface waves | |||
| K | P | X | Other sea environmental |
| T1 | = | K | - | CREX |
| T2 | = | S | - | Surface |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | S | A | 01-29 | Routinely scheduled observations for distribution from automatic (fixed or mobile) land stations (e.g. 0000, 0100, … or 0220, 0240, 0300, …, or 0715, 0745, … UTC) | n/a | 000/006 |
| K | S | A | 30-59 | N-minute observations from automatic (fixed or mobile) land stations | n/a | 000/007 |
| K | S | B | Radar reports (parts A and B) | RADOB | 006/003 | |
| K | S | C | 01-45 | Climatic observations from land stations | CLIMAT | 000/020 |
| K | S | C | 46-59 | Climatic observations from marine stations | CLIMAT SHIP | 001/020 |
| K | S | D | Radiological observation | RADREP | 010/001 | |
| K | S | E | Measurement of surface ozone | n/a | 008/000 | |
| K | S | F | Source of atmospherics | SFAZI, SFLOC, SFAZU | 000/030 | |
| K | S | I | 01-45 | Intermediate synoptic observations from fixed land stations | SYNOP (SIxx) | 000/001 000/051 |
| K | S | I | 46-59 | Intermediate synoptic observations from mobile land stations | SYNOP MOBIL | 000/004 |
| K | S | M | 01-45 | Main synoptic observations from fixed land stations | SYNOP (SMxx) | 000/002 000/052 |
| K | S | M | 46-59 | Main synoptic observations from mobile land stations | SYNOP MOBIL | 000/005 |
| K | S | N | 01-45 | Synoptic observations from fixed land stations at non-standard time (i.e. 01, 02, 04, 05, ... UTC) | SYNOP (SNxx) | 000/000 000/050 |
| K | S | N | 46-59 | Synoptic observations from mobile land stations at non-standard time (i.e. 01, 02, 04, 05, 07, 08, 10, 11, 13, ..UTC) | SYNOP MOBIL | 000/003 |
| K | S | R | Hydrologic reports | HYDRA | 000/040 | |
| K | S | S | 01-19 | Synoptic observations from marine stations | SHIP | 001/000 |
| K | S | S | 20-39 | One-hour observations from automatic marine stations | n/a | 001/006 |
| K | S | S | 40-59 | N-minute observations from automatic marine stations | n/a | 001/007 |
| K | S | V | Special aeronautical observations (SPECI) | SPECI | 000/011 | |
| K | S | W | Aviation routine weather observations (METAR) | METAR | 000/010 | |
| K | S | X | Other surface data | IAC, IAC FLEET |
| T1 | = | K | - | CREX |
| T2 | = | T | - | ? |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | T | E | Tsunami | |||
| K | T | H | Hurricane, typhoon, tropical storm warning | |||
| K | T | S | Severe weather, SIGMET | |||
| K | T | T | Tornado warning | |||
| K | T | X | Other warnings |
| T1 | = | K | - | CREX |
| T2 | = | U | - | Upper air |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | U | A | Single level aircraft reports (automatic) | AMDAR | 004/000 | |
| K | U | A | Single level aircraft reports (manual) | AIREP/PIREP | 004/001 | |
| K | U | B | Single level balloon reports | n/a | ||
| K | U | C | Single level satellite-derived reports | SAREP | 005/000 | |
| K | U | D | Dropsonde/dropwindsondes | TEMP DROP | 002/007 | |
| K | U | E | Ozone vertical sounding | 008/001 | ||
| K | U | I | Dispersal and transport analysis | n/a | 009/000 | |
| K | U | J | 01-19 | Upper wind from fixed land stations (parts A, B, C and D) | PILOT | 002/001 |
| K | U | J | 20-39 | Upper wind from mobile land stations (parts A, B, C and D) | PILOT MOBIL | 002/003 |
| K | U | J | 40-59 | Upper wind from marine stations (parts A, B, C and D) | PILOT SHIP | 002/002 |
| K | U | K | 01-19 | Radio soundings from fixed land stations (parts A and B) | TEMP | 002/004 |
| K | U | K | 20-39 | Radio soundings from mobile land stations (parts A and B) | TEMP MOBIL | 002/006 |
| K | U | K | 40-59 | Radio soundings from marine stations (parts A and B) | TEMP SHIP | 002/005 |
| K | U | L | Total ozone | n/a | 008/002 | |
| K | U | M | Model derived sondes | |||
| K | U | N | Rocketsondes | |||
| K | U | O | Profiles of aircraft observations in ascending /descending | AMDAR | 002/020 | |
| K | U | P | Profilers | PILOT | 002/010 | |
| K | U | Q | RASS temperature profilers | TEMP | 002/011 | |
| K | U | S | 01-19 | Radiosondes/pibal reports from fixed land stations (parts A, B, C and D) | TEMP | 002/004 |
| K | U | S | 20-39 | Radio soundings from mobile land stations (parts A, B, C and D) | TEMP MOBIL | 002/006 |
| K | U | S | 40-59 | Radio soundings from marine stations (parts A, B, C and D) | TEMP SHIP | 002/005 |
| K | U | T | Satellite derived sondes | |||
| K | U | U | 01-45 | Monthly statistics of data from upper-air stations | CLIMAT TEMP | 002/025 |
| K | U | U | 01-45 | Monthly statistics of data from upper-air stations | CLIMAT TEMP | 002/025 |
| K | U | U | 46-59 | Monthly statistics of data from marine stations | CLIMAT TEMP, SHIP | 002/026 |
| K | U | W | 01-19 | Upper wind from fixed land stations (parts A and B) | PILOT | 002/001 |
| K | U | W | 20-39 | Upper wind from mobile land stations (parts A and B) | PILOT MOBIL | 002/003 |
| K | U | W | 40-59 | Upper wind from marine stations (parts A and B) | PILOT SHIP | 002/002 |
| K | U | X | Other upper air reports |
| T1 | = | K | - | CREX |
| T2 | = | V | - | Upper air |
| T1 | T2 | A1 | ii | Data type | TAC correspondence | Data Category Sub Category (Common Table C13) |
| K | V | A | Forecast at single levels | |||
| K | V | B | Coded SIGWX, Embedded Cumulonimbus | |||
| K | V | C | CREX coded SIGWX, Clear air turbulence | |||
| K | V | F | CREX coded SIGWX, Fronts | |||
| K | V | N | CREX coded SIGWX, Other SIGWX parameters | |||
| K | V | O | CREX coded SIGWX, Turbulence | |||
| K | V | S | Forecast soundings | |||
| K | V | T | CREX coded SIGWX, Icing/Tropopause | |||
| K | V | V | CREX coded SIGWX, Tropical storms, sandstorms, volcanoes | |||
| K | V | W | CREX coded SIGWX, High-level winds | |||
| K | V | X | Other upper air forecasts |