Question

What do the values on the our nearly LTHAD plots represent? Are 
the positive numbers WAA and the negative numbers CAA? The other 
way around? Or do they not represent anything until we multiply 
by -g/f?


Answer

The answer to your question is partly given on the final project
web page here,

http://www.atms.unca.edu/dmiller/atms410/fnlpro_garpfuncs2013.txt

which shows the garp function used to create the nearly LTHAD
(NLTHAD) plots. Assuming positive numbers to be WAA and negative
numbers to be CAA is an oversimplification. Another hint is to be
found at,

http://www.atms.unca.edu/dmiller/atms410/at410_fnlpro2013.html

in { } parentheses after the "nearly LTHAD" title above the links
to the plots.