Products based on an ensemble of forecasts providing an estimate of the reliability of a single forecast.

**The purchase of the "Basic Set" +72, +96, +120, +144, +168 hrs is a mandatory prerequisite for the purchase of time steps in the range 12 to 66 hours.**

The following sub-sets are available from the ENS-WAM:

- IV-i: Wave fields
- IV-ii-a: Probabilities - Instantaneous weather events
- IV-ii-b: Probabilities - Averaged weather events
- IV-iii-a: Extreme Forecast Index (EFI) 1-day ranges
- IV-iii-b: Shift of Tails (SOT) 1-day ranges

### based IV-i: Wave fields

(dissemination data stream indicator = W)

12 UTC based Forecast time | 00 UTC based Time available |
12 UTC based Time Available |
---|---|---|

Forecast Day 0 | 07:00 | 19:00 |

Forecast Day 10 | 07:40 | 19:40 |

Forecast Day 15 | 08:00 | 20:00 |

Derived products Step 0 to 240 | 07:41 | 19:41 |

Derived products Step 246 to 360 | 08:01 | 20:01 |

### IV-ii: Probabilities

(dissemination data stream indicator = U)

12 UTC based Forecast time | Time Available | 00 UTC based Forecast time | Time available |
---|---|---|---|

Forecast Day 0 | 19:00 | Forecast Day 0 | 07:00 |

Forecast Day 10 | 19:40 | Forecast Day 10 | 07:40 |

Forecast Day 15 | 20:00 | Forecast Day 15 | 08:00 |

Derived products Step 0 to 240 | 19:41 | Derived products Step 0 to 240 | 07:41 |

Derived products Step 246 to 360 | 20:01 | Derived products Step 246 to 360 | 08:01 |

### IV-iii: Extreme Forecast Index & Shift of Tails

(dissemination data stream indicator = U)

12 UTC based Forecast time | Time Available | 00 UTC based Forecast time | Time available |
---|---|---|---|

Forecast Day 0 | 19:00 | Forecast Day 0 | 07:00 |

Forecast Day 10 | 19:40 | Forecast Day 10 | 07:40 |

Forecast Day 15 | 20:00 | Forecast Day 15 | 08:00 |

Derived products Step 0 to 240 | 19:41 | Derived products Step 0 to 240 | 07:41 |

Derived products Step 246 to 360 | 20:01 | Derived products Step 246 to 360 | 08:01 |

All tables are sortable by column. Use your browser search for specific parameters.

Inv | Terms convention |
---|---|

(inv) | Invariant field. If requested these parameters can be provided free of charge |

**Product resolution:** 0.25° x 0.25° lat/long grid or any multiple thereof (global or sub-area)

Time | Forecast time step | Base time |
---|---|---|

T+0 to T+90 | hourly | 00/06/12/18 UTC |

T+90 to T+144 | 3-hourly | 00/06/12/18 UTC |

T+150 to T+360 | 6-hourly | 00/12 UTC |

**Product resolution:** 0.25° x 0.25° lat/long grid or any multiple thereof (global or sub-area)

Time | Forecast time step | Base time |
---|---|---|

T+24 to T+360h | 12-hourly | 00 UTC and 12 UTC |

Forecast ranges |
Base time |
---|---|

2 -day period covering 120h < T ≤ 168h |
00 UTC and 12 UTC |

3 -day period covering 168h < T ≤ 240h |
00 UTC and 12 UTC |

5 -day period covering 120h < T ≤ 240h |
00 UTC and 12 UTC |

5-day periods: 240h < T ≤ 360h |
00 UTC and 12 UTC |

## IV-ii-a: Probabilities - Instantaneous weather events

Short Name | ID | Long Name | Units | Additional information |
---|---|---|---|---|

swhg2 | 131074 | Significant wave height of at least 2 m | % | |

swhg4 | 131075 | Significant wave height of at least 4 m | % | |

swhg6 | 131076 | Significant wave height of at least 6 m | % | |

swhg8 | 131077 | Significant wave height of at least 8 m | % | |

mwpg8 | 131078 | Mean wave period of at least 8 s | % | |

mwpg10 | 131079 | Mean wave period of at least 10 s | % | |

mwpg12 | 131080 | Mean wave period of at least 12 s | % | |

mwpg15 | 131081 | Mean wave period of at least 15 s | % |

Short Name | ID | Long Name | Units | Additional information |
---|---|---|---|---|

swhg2 | 131074 | Significant wave height of at least 2 m | % | |

swhg4 | 131075 | Significant wave height of at least 4 m | % | |

swhg6 | 131076 | Significant wave height of at least 6 m | % | |

swhg8 | 131077 | Significant wave height of at least 8 m | % | |

mwpg8 | 131078 | Mean wave period of at least 8 s | % | |

mwpg10 | 131079 | Mean wave period of at least 10 s | % | |

mwpg12 | 131080 | Mean wave period of at least 12 s | % | |

mwpg15 | 131081 | Mean wave period of at least 15 s | % |

Short Name | ID | Long Name | Units | Additional information |
---|---|---|---|---|

maxswhi | 132216 | Maximum of significant wave height index | (-1 to 1) |

Short Name | ID | Long Name | Units | Additional information |
---|---|---|---|---|

maxswhi | 132216 | Maximum of significant wave height index | (-1 to 1) |