Each hour the site records what every source was forecasting at every TAF airport at fixed lead times (1–48 h). When that hour arrives, the forecast is scored against the METAR nearest the hour (± 10 min; fog, low ceiling / visibility and gust events also count from SPECIs within ± 30 min). Persistence — the latest METAR carried forward — is the baseline a forecast must beat. n is shown with every number; fewer than 30 cases are greyed out as still collecting. Scores are pooled over all airports with data for that source.