Wind forecasts on Lakebrief don't come from a single source. The Open-Meteo API exposes the same coordinates queried against multiple numerical weather prediction models, and Lakebrief lets you toggle between them or view them side-by-side on the multi-model grid. The four currently wired:
- ECMWF IFS 0.25°. The European Centre for Medium-Range Weather Forecasts' Integrated Forecasting System. The most accurate global model in independent verification studies, especially at 24–72 hour lead times. Updated four times daily. Lakebrief uses this as the default.
- NOAA GFS HRRR. The High-Resolution Rapid Refresh model from the National Oceanic and Atmospheric Administration. 3 km horizontal resolution, updated hourly, US-only, only useful for the next 48 hours. Captures convection (thunderstorms, mesoscale features) better than the global models — when HRRR shows winds spiking that the others don't, that often means storm-scale dynamics the global models smooth out.
- DWD ICON Global. The Deutscher Wetterdienst's global model, ~13 km resolution. Independent of ECMWF, so when ICON and ECMWF agree on a forecast, confidence goes up.
- NOAA GFS. The Global Forecast System, 0.25° resolution, ten-day forecasts. Widely used in the US sailing community. Less accurate than ECMWF on average but freely available and updated four times daily.
The reason to ensemble rather than pick one: when models agree, the forecast is high-confidence; when they disagree, that disagreement is itself a signal. A 12-knot wind that all four models agree on at 2 PM Saturday is a much safer planning bet than a 12-knot wind that ECMWF predicts but HRRR shows as 18 kt with gusts to 28 kt.
Practically, for a same-day decision: HRRR is usually the right model — it ingests the latest radar and surface observations and refreshes hourly. For a weekend regatta you're planning Wednesday: ECMWF is the most reliable. For "should I plan a charter trip three weeks out": no model is reliable that far out and you should plan around climatology.
Lakebrief's wind-model toggle is in the header on every page. Switching it changes every wind-related number (current conditions, hourly forecast, optimal window) site-wide. The multi-model grid on the Forecast page shows all four side by side for the next 24 hours, color-coded by intensity, so you can spot disagreement at a glance.