| Code | Description | Units | Version |
|---|---|---|---|
| 0DEG | level of 0 degC isotherm | GRIB1/GRIB2 | |
| ADCL | level of adiabatic condensation lifted from the surface | GRIB1/GRIB2 | |
| BCY | Boundary layer cloud layer | GRIB1 | |
| CBL | cloud base level | GRIB1/GRIB2 | |
| CCBL | Convective cloud bottom level | GRIB1 | |
| CCTL | Convective cloud top level | GRIB1 | |
| CCY | Convective cloud layer | GRIB1 | |
| CTL | level of cloud tops | GRIB1/GRIB2 | |
| DBLL | Depth below land surface | cm | GRIB1/GRIB2 |
| DBLY | Layer between two levels below land surface | cm | GRIB1 |
| DBSL | Depth below sea level | m | GRIB1 |
| EATM | entire atmosphere layer | GRIB1/GRIB2 | |
| EOCN | entire ocean layer | GRIB1 | |
| GPML | specified altitude above MSL | m | GRIB1/GRIB2 |
| GPMY | layer between two specified altitudes above MSL | m | GRIB1 |
| HCBL | High cloud bottom level | GRIB1 | |
| HCTL | High cloud top level | GRIB1 | |
| HCY | High Cloud Layer | GRIB1 | |
| HGLH | Height above ground (high precision) | cm | GRIB1 |
| HTFL | Highest tropospheric freezing level | GRIB1/GRIB2 | |
| HTGY | layer between two specified height levels above ground | m | GRIB1 |
| HYBL | hybrid level | GRIB1 | |
| HYBY | Layer between two hybrid levels | GRIB1 | |
| ISBL | isobaric level | hPa | GRIB1/GRIB2 |
| ISBY | layer between two isobaric levels | hPa | GRIB1 |
| LCBL | Low cloud bottom level | GRIB1 | |
| LCTL | Low cloud top level | GRIB1 | |
| LCY | Low Cloud Layer | GRIB1 | |
| MCBL | Middle cloud bottom level | GRIB1 | |
| MCTL | Middle cloud top level | GRIB1 | |
| MCY | Middle Cloud Layer | GRIB1 | |
| MSL | mean sea level | GRIB1/GRIB2 | |
| MWSL | maximum wind level | GRIB1/GRIB2 | |
| NTAT | nominal top of atmosphere | GRIB1 | |
| PBL | planetary boundary layer | GRIB2 | |
| PVL | potential vorticity surface | 10-6 km2/kgs | GRIB1 |
| SEAB | sea bottom | GRIB1 | |
| SFC | ground or water surface | GRIB1/GRIB2 | |
| SIGL | Sigma level | sigma | GRIB1 |
| SIGY | Layer between two sigma layers | GRIB1 | |
| SPDY | Layer between pressure differences from ground to levels | hPa | GRIB1 |
| TGL | specified height level above ground | m | GRIB1/GRIB2 |
| THEL | Isentropic (theta) level | K | GRIB1 |
| THEY | Layer between two isentropic layers | K | GRIB1 |
| TMPL | isothermal level | K | GRIB1 |
| TRO | tropopause | GRIB1/GRIB2 |