NOAA GFS Rainfall Forecast

About this data

• NOAA GFS forecast: NOAA Global Forecast System (GFS) 0.13° deterministic (precipitation) + 0.25° (MSLP) – U.S. Government work, public domain, via Open-Meteo Open Data
• Model runs: Four runs a day (00, 06, 12 and 18 GMT). GFS itself reaches 16 days; this feed is cut at 7 to keep a run to a workable number of frames, so every run here is the same length and none is marked short. Steps are hourly to T+120h and 3-hourly after that.
• Trial pipeline: this feed is built by a second, newer data pipeline (a small always-on server rather than the site's usual scheduled jobs), run alongside the existing one to see how well it holds up. It does not yet run on a fixed schedule, so it may go stale between manual updates — check the freshness dot above for its actual age.
• Deterministic, not a probability: this is a single model solution, so it shows one possible outcome rather than a range. Treat it as guidance on pattern and timing, not as a forecast of exact totals at a place.
• Comparing models: all four render to the same map extent with the same colour scale, so a colour means the same millimetres whichever is selected. Differences you see between them are the models disagreeing, not the maps being drawn differently.
• Isobars (MSLP): off by default; switch on in the panel above (or in the bottom bar, on a wide enough screen) to add pressure lines over the rainfall. H/L pressure centres are labelled with their central pressure in hPa.
• Catchment boundaries: National River Flow Archive (2014). NERC Environmental Information Data Centre. doi:10.5285/1957166d.
• Region / county boundaries: Office for National Statistics (ONS), Open Government Licence v3.0. Contains OS data © Crown copyright and database right.
• Basemap: © OpenStreetMap contributors © CARTO.