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For some parameters, ECMWF has been providing values in units which are not the official WMO units. The static sample dataset also includes examples of the same parameters but with values provided in the official WMO units. These parameters are provided in files identified by the ECMWF paramId and shortName in the file name but with the additional tag "_wmo_units". For example, the total precipitation parameter, which ECMWF has been providing in units of "metres" (m), is also provided in units of kg/m2 in a file named 228_od_oper_fc_sfc_tp_2024_0001_regular_ll_wmo_units.grib2.
| class / stream / type / levtype | Parameters encoded with ECMWF units | Parameters encoded with WMO units | ||||||
|---|---|---|---|---|---|---|---|---|
| paramId | shortName | name | units | paramId | shortName | name | units | |
| 141 | sd | Snow depth | m of water equivalent | 3066 | sde | Snow depth | m |
| 142 | lsp | Large-scale precipitation | m | 3062 | lsp | Large-scale precipitation | kg m**-2 |
| 143 | cp | Convective precipitation | m | 228143 | cp | Convective precipitation | kg m**-2 |
| 144 | sf | Snowfall | m of water equivalent | 260025 | asnow | Total snowfall | m |
| 182 | e | ||||||
| 198 | src | Skin reservoir content | m of water equivalent | 160198 | srcon | Skin reservoir content | kg m**-2 |
| 205 | ro | Runoff | m | 231002 | rowe | Runoff water equivalent (surface plus subsurface) | kg m**-2 |
| 228216 | fzra | Accumulated freezing rain | m | 231001 | fzrawe | Accumulated freezing rain water equivalent | kg m**-2 |
| 228251 | pev | Potential evaporation | m | 231005 | peva | Potential evaporation | kg m**-2 |
| 228 | tp | Total precipitation | m | 228228 | tp | Total precipitation | kg m**-2 |
| 44 | es | Snow evaporation | m of water equivalent | 231003 | eswe | Snow evaporation water equivalent | kg m**-2 |
| 45 | smlt | Snowmelt | m of water equivalent | 3099 | snom | Snowmelt | kg m**-2 |
| 8 | sro | Surface runoff | m | 231010 | ssurfro | Surface runoff | kg m**-2 |
| 9 | ssro | Sub-surface runoff | m | 231012 | ssurfro | Sub-surface runoff | kg m**-2 |
| class / stream / type / levtype | Parameters encoded with ECMWF units | Parameters encoded with WMO units | ||||||
|---|---|---|---|---|---|---|---|---|
| paramId | shortName | name | units | paramId | shortName | name | units | |
| 164 | tcc | Total cloud cover | (0 - 1) | 228164 | tcc | Total cloud cover | % |
| 186 | lcc | Low cloud cover | (0 - 1) | 3073 | lcc | Low cloud cover | % |
| 187 | mcc | Medium cloud cover | (0 - 1) | 3074 | mcc | Medium cloud cover | % |
| 188 | hcc | High cloud cover | (0 - 1) | 3075 | hcc | High cloud cover | % |
| 15 | aluvp | UV visible albedo for direct radiation (climatological) | (0 - 1) | 210199 | aluvp_p | UV visible albedo for direct radiation (climatological) | % |
| 16 | aluvd | UV visible albedo for diffuse radiation (climatological) | (0 - 1) | 210198 | aluvd_p | UV visible albedo for diffuse radiation (climatological) | % |
| 17 | alnip | Near IR albedo for direct radiation (climatological) | (0 - 1) | 210261 | alnip_p | Near IR albedo for direct radiation (climatological) | % |
| 18 | alnid | Near IR albedo for diffuse radiation (climatological) | (0 - 1) | 210260 | alnid_p | Near IR albedo for diffuse radiation (climatological) | % |
| 32 | asn | Snow albedo | (0 - 1) | 228032 | asn | Snow albedo | % |
| 174 | al | Albedo (climatological) | (0 - 1) | 260509 | al | Forecast albedo | % |
| 243 | fal | Forecast albedo | (0 - 1) | 260509 | al | Forecast albedo | % |
| 210186 | aluvpi | UV visible albedo for direct radiation, isotropic component (climatological) | (0 - 1) | 210201 | aluvpi_p | UV visible albedo for direct radiation, isotropic component (climatological) | % |
| 210187 | aluvpv | UV visible albedo for direct radiation, volumetric component (climatological) | (0 - 1) | 210202 | aluvpv_p | UV visible albedo for direct radiation, volumetric component (climatological) | % |
| 210188 | aluvpg | UV visible albedo for direct radiation, geometric component (climatological) | (0 - 1) | 210200 | aluvpg_p | UV visible albedo for direct radiation, geometric component (climatological) | % |
| 210189 | alnipi | Near IR albedo for direct radiation, isotropic component (climatological) | (0 - 1) | 210263 | alnipi_p | Near IR albedo for direct radiation, isotropic component (climatological) | % |
| 210190 | alnipv | Near IR albedo for direct radiation, volumetric component (climatological) | (0 - 1) | 210264 | alnipv_p | Near IR albedo for direct radiation, volumetric component (climatological) | % |
| 210191 | alnipg | Near IR albedo for direct radiation, geometric component (climatological) | (0 - 1) | 210262 | alnipg_p | Near IR albedo for direct radiation, geometric component (climatological) | % |
| 206 | tco3 | Total column ozone | kg m**-2 | 260132 | tcioz | Total column integrated ozone | Dobson Units (DU) |