Some PSD datasets and products are not up-to-date due to a system problem. We are working on a fix.
  (Wesley's E-mail address is now: Wesley.Ebisuzaki@noaa.gov)
From ebis@wesley.wwb.noaa.gov Wed May 12 07:23 MDT 1999
From: ebis@wesley.wwb.noaa.gov
Subject: Re: 1948 NCEP Reanalysis pgb.f00 GRIBs
To: Don.K.Hooper@noaa.gov (Don Hooper)
Date: Wed, 12 May 1999 09:21:38 -0400 (EDT)
In-Reply-To: mail from "Don Hooper" at May 11, 99 05:34:37 pm

> Wesley,
> 
> I just started looking at the 1948 Reanalysis pgb.f00 GRIBs.  Imagine my
> surprise when I detected that they are 8 times daily (as are the sanl
> ones, but not, apparently, the grb2d ones).  What's up with that?  I'm
> glad the grb2d ones appear to be still just 4x daily, as I'm planning to
> just use the 0z, 6z, 12z, and 18z files, which I'm thinking wouldn't
> work for grb2d if it were 8x daily.  I couldn't find any scoop on this
> on either your or NCAR's web pages.  It's a little stunning....
> 
> Thanks,
> -Hoop

Hoop,

   Prior to '57 or '58 the standard obs times were (n*6 + 3) Z.  To
get the best analyses, the analysis time was switched from (n*6) Z to
(n*6+3) Z.  
   Bob had to do a lot of work to make the files look like the
current ones.  The n*6 Z pgb.f00's are really 3 hour forecasts
and the grb2d's are a 3-6 + 0-3 accumulations.
   I should write this up.

          Wesley