[gradsusr] Saving to .nc file

[jason at solargrafix.com]

Hello,

I am trying to save a time series to a .nc file using the following 
code...

  'set t 1 last'
  'set sdfwrite -4d -nc4 C:\OpenGrADS-2.2\data\HRRRGPA.nc'
  'sdfwrite gpa'

The first time step saves fine, but no other time steps are saved, I 
just get a blank map with a date that reads Jan 01. 0001.  How can I 
save all of the time steps with the correct time stamps into one .nc 
file.

Thank you,
Jason Warren