[ Read Responses | Return to the Index ]
[ Previous | Previous in Thread | Next in Thread | Next ]
Posted by Stan Benjamin on 15 Jan 02, 10:08 MT, in response to Wind vector representation in Lambert Conformal projection, posted by Vandevenne Herman F on 15 Jan 02, 9:28 MT
All gridded wind output from NCEP from RUC or other models is grid-relative for direction. The speed is true, and is not affected by map-scale factor issues.
To get lat/lon-relative u/v, you must rotate the winds by the following angle: 0.422618 * (longitude - long_true), where long_true is -95.0 (95 deg W) and longitude is at each grid point. The 0.422618 factor is for the Lambert conformal projection used for the RUC.
The FSL RAP/HRRR/RUC Information Forum is maintained with a variant of WebBBS .