This is concerning this question:
The data from the old wind forecasts probably came from NOAA, and it's available here. The raw data is in the form of GRIB files.
You can do a search for "GRIB Viewer" and find some apps that will work. You can also search for "GRIB KML", and might be able to download grib files in a KML/KMZ format that can be shown on Google Earth or Google Maps.
How can I add this Data to the online Googlemaps, so I can use it like It was presented earlyer by windfinder?
Or is this only possible in google-earth?