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 PassageWeather

PassageWeather.com was developed out of the need for reliable, easy to use weather information and forecasts to help sailors with their passage planning and weather routing.

Both before and during deliveries, ocean races, regattas, cruises and all other types of offshore passages, we have your whole route covered.

Our forecast charts are created using weather data provided by the US National Weather Service (NWS), the National Oceanic and Atmospheric Administration (NOAA), and the National Centers for Environmental Prediction (NCEP).

Our Surface Wind, Surface Pressure, Visibility, Precipitation and Cloud Cover charts are derived from the GFS (Global Forecast System) model, one of the operational forecast models run at NCEP. The GFS model is run four times daily, with forecast output to 180 hours (~7 days).

Our Wave Height & Direction charts are derived from the WW3 (WaveWatch III) model, the third generation of the wave model developed at NOAA/NCEP. The WW3 model is also run four times daily, with forecast output to 180 hours (~7 days).

Note: The Great Lakes WW3 wave model only provides forecast output to 84 hours (3.5 days)

The Wave Height & Direction charts for the Mediterranean Sea are derived from the WAM4 wave model run by the Atmospheric Modelling and Weather Forecasting Group of the University of Athens. The WAM4 model is run once a day, with forecast output to 60 hours (2.5 days)

The Gulf Stream Velocity and Direction charts (as well as these regions' Sea Surface Temperature charts) use data from the Real-Time Ocean Forecast System (RTOFS), a basin-scale ocean forecast model developed by NOAA's Environmental Modeling Center. The RTOFS model is run once a day, with forecast output to 120 hours (5 days).

We create the Sea Surface Temperature analysis charts using AVHRR + AMSR data from NASA's Earth Observing Satellite System, as well as ship and buoy SST observations. This data is produced daily, with output analysis valid the previous day.