I have a program I developed many years ago in QuickBASIC, now ported to Visual Basic that you can run outside of PCGRIDDS32 and it will write a command file. It is at:
Put it in the MACROS directory and run it, change the dir and speed for the system of interest, and a SYST.CMD file will be produced that will display the system relative wind vectors, pressure on that isentropic surface, and resulting vertical motion on that isentropic surface.
Depending on your OS and what you have installed on it, you might need the MS VB6 runtime files available here
At the time, I was supplied a macro from another person, that purports to do the same within PCGRIDDS only for a layer (i.e. you need to SLYR i295 i300, or whatever), but I could never get it to work. That macro is below if anyone wants to see if they can get it to work.
TXT2 Enter STORM DIRECTION (degrees) at the prompt for a constant to add.
TXT3 Enter STORM SPEED at the prompt for constant to multiply by.
CONT SDIF SSWP EDIR SADC ZERO
CONT SMLC -1 COSN SSWP SMLC -1 SINE SCPY LAST
CONT VMLC LAST
VDIF VSWP (WIND lave) LAST clr6
smlc 1+03 ((advt (pres lave,last)) grtn 0. clr3)/
smlc 1+03 ((advt (pres lave,last)) lstn 0. clr4 dash)/
pres ci50 clr5 lave/
TXTP --- Adiabatic Vertical Motion (microbars/sec) ---
TXTQ --- Brown is Pressure (mb) ---
TXTR --- Green indicates UPWARD ---
TXTS --- Yellow indicates DOWNWARD ---