About 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.
 

 About Our Forecasts

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 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 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, developed at NOAA/NCEP. The WW3 model is also run four times daily, with forecast output out 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.

 Disclaimer

The user assumes the entire risk related to its use of this data. PassageWeather.com is providing this data "as is", and PassageWeather.com disclaims any and all warranties, whether express or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will PassageWeather.com be liable to you or to any third party for any direct, indirect, incidental, consequential, special or exemplary damages or lost profit resulting from any use or misuse of this data.