Good morning,
Did you ask google for that filename?  It would have found it for you :)
Anyway, you can get it directly here:
http://mtarchive.geol.iastate.edu/2011/10/29/gempak/surface/sao/
daryl
On Wed, 27 Mar 2013, Robert Ballentine wrote:
ldm-users:
  Can anyone provide access to me for the gempak file
20111030_sao.gem?  I have a Senior Seminar student
doing a project on the nor'easter on that date.  I have the
file for 20111029 but somehow we lost the sao file for the
30th.
  Thanks
  Bob Ballentine, SUNY Oswego
--
/**
 * Daryl Herzmann
 * Assistant Scientist -- Iowa Environmental Mesonet
 * http://mesonet.agron.iastate.edu
 */