WeatherNext 3 pushes AI forecasting toward hourly, five-kilometer decisions

Google DeepMind says WeatherNext 3 can turn live satellite imagery and sparse station observations into higher-resolution forecasts refreshed every hour. The system produces surface temperature and moisture estimates at up to five-kilometer resolution, other surface variables at ten kilometers, and atmospheric variables at 25 kilometers. That is roughly five times sharper in key outputs than WeatherNext 2's 25-kilometer, six-hour forecasts. Google reports early-lead probabilistic precipitation improvements of up to 60 percent against IMERG satellite data, 30 percent against U.S. radar estimates, and 10 percent against rain gauges. It also says longer forecasts can be up to 50 percent more accurate, with the largest improvements in places where previous predictions were less reliable. The deployment footprint is broad: WeatherNext 3 is feeding Google Search, Gemini, Maps, Maps Platform, and Earth Engine. New energy variables include wind speed at 100 meters and measures of cloud and solar radiation that could support renewable generation planning. These are meaningful company-reported gains, not proof of equal performance everywhere. Floods, tropical cyclones, mountains, sparse-observation regions, and rare extremes remain the real test. Users should examine calibration, false alarms, lead time, regional error, and whether better scores improve decisions. Google itself directs people to national meteorological agencies for official warnings. Faster, sharper forecasts matter only when institutions can interpret them and act.