YOPP dataset consists of two different ECMWF outputs:

### 1) Operational ensemble forecast (ENS IFS)

**Medium-range forecast up to +360 hours **(3-hourly up to 144 hours, then 6-hourly outputs)- Archived in MARS as
**Control forecast** (type=cf, stream=enfo, class=yp) - 7 additional pressure levels to have a better vertical resolution in higher altitudes

### 2) Dedicated research run containing additional tendencies

**Short-range forecast up to +48 hours **(3-hourly outputs)

Archived in MARS as **Forecast** (type=fc, stream=oper, class=yp)

Research run that mimics very closely the operational control forecast of the ENS IFS was run from the 15.7. 2017 onwards

Additional tendencies from various physical and dynamical processes were archived on model levels (not available from ENS IFS run)

The differences for all parameters are on average small compared to the control forecast run, however, locally there can be differences in some parameters

The tendencies are described in the table below

Field 3D (note tendencies and fluxes are accumulated) | Units | Grib code^{*1} |
---|

u-tendency from explicit dynamics | m/s2 * s | 162114 |

v-tendency from explicit dynamics | m/s2 * s | 162115 |

T-tendency from explicit dynamics | K/s * s | 162116 |

q-tendency from explicit dynamics | kg/kg/s * s | 162117 |

T-tendency from radiation | K/s * s | 162118 |

u-tendency from vert. diff + orog drag + surf processes | m/s2 * s | 162119 |

v-tendency from vert. diff + orog drag + surf processes | m/s2 * s | 162120 |

T-tendency from vert. diff + orog drag + surf processes | K/s * s | 162121 |

q-tendency from vert. diff + orog drag + surf processes | kg/kg/s * s | 162122 |

u-tendency of gravity wave drag (including non-orographic) | m/s2 * s | 162123 |

v-tendency of gravity wave drag (including non-orographic) | m/s2 * s | 162124 |

T-tendency of gravity wave drag (including non-orographic) = dissipation wave break | K/s * s | 162125 |

u-tendency from convection (deep+shallow) | m/s2 * s | 162126 |

v-tendency from convection (deep+shallow) | m/s2 * s | 162127 |

T-tendency from convection (deep+shallow) | K/s * s | 162128 |

q-tendency from convection (deep+shallow) | kg/kg/s * s | 162129 |

Precip. flux from convection liquid | kg/(m2 s) * s | 162130 |

Precip. flux from convection ice | kg/(m2 s) * s | 162131 |

T-tendency from cloud scheme | K/s * s | 162132 |

q-tendency from cloud scheme | kg/kg/s * s | 162133 |

ql-tendency from cloud scheme (stratiform) | kg/kg/s * s | 162134 |

qi-tendency from cloud scheme (stratiform) | kg/kg/s * s | 162135 |

*1 paramId in ECMWF's ecCodes