SCW is a weather information service that presents high-resolution forecasts and observation data on interactive maps. It uses a supercomputer to calculate predictions from meteorological models, including models from Japan’s Meteorological Agency and the U.S. National Oceanic and Atmospheric Administration. Users can explore rainfall and cloud cover, pressure and wind, temperature and humidity, storm tracks, satellite imagery, cloud types and heights, and coastal wave conditions.

Forecast products cover different time ranges and levels of detail. The detailed forecast provides hourly predictions up to 39 hours ahead on a 5-kilometer grid, while the wider-area forecast extends up to 11 days on a 20-kilometer grid. Coastal wave forecasts include wave height, direction, and period, with detailed predictions available up to 72 hours ahead. The service also displays current and past observations, and offers paid membership features. SCW notes that numerical predictions contain uncertainty and are supporting information rather than a finished weather forecast, advising users to consult forecasts prepared by professional forecasters when needed.