Where can I find the NOAA's winds aloft data in a form that I can use in an application? I plan to develop a software able to calculate the flight path of a lighter than air aircraft or drone using windspeed data from the NOAA Global Forecast System.
See the following web page:
This page describes getting started with the HTTP or FTP access to NOAA weather service APIs.
The GFS products can be accessed at http://www.nco.ncep.noaa.gov/pmb/products/gfs/. You can use the filename scheme they list to pull down current forecast products from FTP. These are the native output grids in grib2 format.