Meteorology 341- Visualization of Atmospheric Processes


Assignment #4

Purpose: To become familiar with using Gempak interactively. Develop ability to print graphics and create graphics files.


1.) Create a subdirectory called gempak.

2.) Copy all of the .nts files out of /home/atmos/f/skrueger/class/met341/assign4/ to your subdirectory gempak.

3.) Develop and save a .nts file that uses gdcntr to display in an X window a contour plot of gridded 500 mb temperatures over the western U.S.

4.) Create and save a .nts file that uses gdwind to display in an X window gridded 300 mb vector winds as wind barbs. Use the GEMPAK variable SKIP to plot wind barbs at every second or third grid point in both N-S and E-W directions.

5.) Create and save a .nts file that uses gdplot to write a PostScript file that will print 300 mb wind barbs and 300 mb height contours on the same plot.

6.) Create and save a .nts file that uses gdcntr to create a gif image file of a contour plot of gridded 700 mb relative humidity using contour filling for RH greater than 70% and less than 30%. Use different fill colors for the two ranges.


Print the .nts files and turn them in along with the plot created by the PostScript file. Write the path and name of the gif file on the listing of the .nts files.
Last updated on 18 October 1997