Skip Navigation Links 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
Climate Prediction Center

About Us
   Our Mission
   Who We Are

Contact Us
   CPC Information
   CPC Web Team

HOME > Monitoring_and_Data > Oceanic and Atmospheric Data > Reanalysis: Atmospheric Data > wgrib2-new_grid_winds

wgrib2: -new_grid_winds


The -new_grid_winds option selects the wind rotation/orientation for the -new_grid option. Most users will want the winds to be oriented to the earth's north and south directions. This is done by using the -new_grid_winds earth option. Many of NCEP grids have the winds being rotated so that north direction is relative to the grid; i.e., grid point (i,j) to (i,j+1). For lat-lon, Mercator and Gaussian grids, the grid and earth relative directions are the same. For the Lambert conformal, polar stereographic and various rotated grids, the directions are different.

To make the interpolated wind fields have a earth (grid) orientation, you have to use the -new_grid_winds earth or to use the -new_grid_winds grid option before doing the interpolation. The exception is the "-new_grid grib". In this case, the grid definition and default wind rotation is read from a grib file. In this case, a -new_grid_winds option will override the wind rotation read from the file.

The wind orientation applies to all the identified vector fields: "UGRD", "VGRD", "VUCSH", "VVCSH","UFLX", "VFLX", "UGUST","VGUST","USTM","VSTM","VDFUA", "VDFVA", "UOGRD","VOGRD".

In the future, the wind orientation will be a part of the -new_grid option. However, the current systax will still work.


-new_grid_winds X
    X = earth, grid
See also: -new_grid, -new_grid_vectors -new_grid_interpolation

NOAA/ National Weather Service
National Centers for Environmental Prediction
Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
Climate Prediction Center Web Team
Page last modified: June 17, 2019
Disclaimer Privacy Policy