Wind representation on NMC grids

"Eight codes in the NMC subroutine library (W3LIB) which manipulate winds on stereographic grids, neglect to take proper account of wind values at the poles. This note discusses a solution to this problem and illustrates the methods used at NMC to represent winds at the poles and elsewhere. The procedures used in the aforementioned subroutines involve the conversions of true winds to grid oriented winds, the converse of this process, the conversion of vector wind u,v components to true direction and speed, and finally the converse of this process. The results section summarizes and verifies the accuracy of the revised codes"--Introduction. Paul G. Ringmacher. "August 1981." "This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members." Includes bibliographical references. 1981 NWS (National Weather Service) Library Public Domain 1931