[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Addition of 0.5 degree GFS hours, RUC GRIB2

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.


  • Subject: Re: Addition of 0.5 degree GFS hours, RUC GRIB2
  • Date: Wed, 09 Aug 2006 16:05:23 -0600

On Wed, 2006-08-09 at 14:36 -0700, Harry Edmon wrote:
> I have noticed some differences in the new file names versus what is on 
> your web page:
> 
> 1. GFS:  For the 18Z run it appears there are only two digits in the 
> forecast hour in the name:
> 
>     gfs.tHHz.pgrbfFF  instead of gfs.tHHz.pgrbfFFF

NCEP doesn't prepend the leading 0 in the forecast hour, so it goes to
FFF at 102 hours (otherwise it is just FF). I'll update the web page to
clarify that. 

> 
> 2. RUC: The initialization hour is not in the name like it is in the GFS:
> 
>     .../prod/ruc2a.YYYYMMDD versus
>     .../prod/gfs.YYYYMMDDHH
> 
> Also the forecast hour is two digits just like the 18Z GFS.  Are these 
> both permanent?

Yes, the RUC files are in daily directories on the ftpprd.ncep.noaa.gov
server. You can consistently key on the initialization hour in the
\.t(..)z\. field, but not in the
directory name.

Steve Chiswell
Unidata User Support

-- 
Steve Chiswell <address@hidden>
Unidata