The Fish Index is based on Solar and Lunar Data for Grand Haven Light, MI. By calculating solar and lunar data, we devise a number to indicate the best times to fish in Grand Haven Light, MI. The higher the number the more likely fish will bite. The Fishing Index is based on the Solunar Theory devised by John Alden Knight.
Time displayed is based on Grand Haven Light, MI local time. The wind graph displays observations as reported in knots. The blue line and shaded area represents the average wind speed, the red represents gust value, and the green represents lull. Dots along the lines indicate time of data reported. The yellow arrows represent observed wind direction. An arrow pointing down indicates wind blowing from north to south, and is commonly referred as a "north wind". Note: frequency (and latency) of data is a function of the individual reporting station. Many non-WeatherFlow stations report data only once per hour. Check sensor notes for information on data source. Please read and understand disclaimer before using this information.
This Wind Obs + Marine FX map represents observed and forecasted surface values at specific locations at selected time intervals. The map displayed corresponds to MI - north local time as stamped in the upper right corner of the map. "N/A" indicates data not available. For detailed information on each site, including exact time of observation, simply mouse-over the site for a data pop-up. You may also click on a site for wind graphs, tides, meteograms, sensor notes, and more. A wind vector pointing down represents wind blowing from north to south, and is commonly referred as a "north wind". A yellow direction arrow denotes observations from the WeatherFlow network. A red flag indicates a forecast only site. Observations are reported from various other sources including the National Weather Service (NWS), National Ocean Data Buoy Center (NODC) and numerous additional institutions. For credit information on non-WeatherFlow sites displayed on this map, please click on the site of interest. Forecasted values are produced by the WeatherFlow Forecast Modeling System and contain proprietary data and technology protected by all Copyright laws. Please read and understand disclaimer
before using this information.