This site allows you to pick an area where you can look at wind speeds and direction, pressure systems and wave heights. You can animate the charts to see progression of highs and lows and wind direction by the hour. You can also pick the weather for an event, like the Fastnet race the ARC rally and others. This is a free service, in the distant future a plan on offering a paid service on custom weather forecasts and routing.
Passage Weather's Description
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, the third generation of the wave 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 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 NOAAs 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 NASAs Earth Observing Satellite System, as well as ship and buoy SST observations. This data is produced daily, with output analysis valid the previous day.