Metocean AI scoreboard — 9 September 2026 archive
Eight published stations, their 30-day MAE values and frozen sources for checking every field.
Source updated on 9 September 2026 at 06:00 UTC. Evidence page published on 12 September 2026.
The values below copy mae_ia_30d, mae_baseline_30d and metrics_30d.n_points directly from the source file. They are neither an average of the four lead times nor a new calculation.
| Station | Variable | AI MAE | Baseline MAE | Baseline | Unit | N points | Current forecast issue |
|---|---|---|---|---|---|---|---|
| Les Pierres Noires | Wave | 0.1450 | 0.2045 | GFS Wave 0,25° | m | 1,354 | Unavailable |
| Belle-Île | Wave | 0.1038 | 0.1598 | EWAM | m | 1,426 | Unavailable |
| Anglet | Wave | 0.1201 | 0.1143 | Météo-France Wave | m | 1,426 | Unavailable |
| Brest | Water level | 0.0793 | 0.1003 | UTide harmonic, 2 years | m | 1,417 | Available |
| Saint-Malo | Water level | 0.1286 | 0.1717 | UTide harmonic, 2 years | m | 1,225 | Available |
| Ouessant (Le Stiff) | Wind | 1.0794 | 1.3521 | ARPEGE Europe | m/s | 1,417 | Available |
| Dieppe | Wind | 0.8687 | 1.1201 | ARPEGE Europe | m/s | 1,417 | Available |
| Cherbourg (Homet) | Wind | 1.1085 | 1.4821 | ARPEGE Europe | m/s | 1,417 | Available |
Method and provenance
The eight stations are marked as published in stations.json. Wave and wind use the forecast model selected for each station; Brest and Saint-Malo use a UTide harmonic baseline fitted over a rolling two-year period.
The snapshot matches commit 55e1dcb6749704d05f68a0b9c84a072e8ffbe1ec. Both dated source JSON files ship with the archive, and their SHA-256 checksums are checked before regeneration.
Reading limits
- “Unavailable” for the three wave stations means that the current forecast issue was unavailable. This snapshot does not establish the cause. Their 30-day history exists and produces the displayed metrics.
- Observations, forecasts and backfilled data within the rolling window are not independent samples.
- Station selection and publication gates come from the source pipeline. This archive records published outputs; it does not rerun the evaluation.