IS IT THE AVN OR GFS OR MRF OR ....?

• To: <ldm-users@xxxxxxxxxxxxxxxx>
• Subject: IS IT THE AVN OR GFS OR MRF OR ....?
• From: "Tom Grzelak" <grzelak@xxxxxxxxxxxxxxxxxx>
• Date: Tue, 8 Apr 2003 22:31:06 -0500

Here is a chronology of sorts:

03/05/2002 : AVN runs four times a day out to 384 hours. Resolution is
T170L42 to 180h, thereafter T62L28.

04/23/2002 00Z: MRF is replaced by the 00Z AVN.

Sept-Oct 2002: Name changes: The AVN will be referred to as the Global
Forecast System model (GFS).

10/29/02 12Z: Resolution change
old: T170L42 to 180h, T62L28 to 384h
new: T254L64 to 84h, T170L42 to 180h, T126L28 to 384h

Also, see the following:
http://wwwt.emc.ncep.noaa.gov/gmb/STATS/tpb97/TPB02/html/v3.html

Hope this helps
Declan


----- Original Message -----
Sent: Tuesday, April 08, 2003 7:31 PM


>
> I have a question that I hope to gain consensus on.  In speaking with a
> friend from NCEP over winter break, he kept reminding me on how the AVN
was
> now called the GFS.  Is it truly the same model?  Also, is the MRF now
also
> considered the GFS.
>
> We were going to update our weather server to reflect the current lingo
> just like we recently did with the GOES8 to GOES12.  Since my programmer
> just went through that whole ordeal I thought it would be good to have him
> now make the AVN/MRF transition to the GFS.
>
> So I decided to go to the NCEP site and I found current (today) references
> to GFS products, the GFS MRF-like products, MRF products and AVN
> products.  So what DOES NCEP want us to call this(these) model(s)?  Is
> there any reason to continue to use the AVN and MRF terminology?
>
> Thanks!
> Tom
>
>
>
>
>
> ===============================================================
> Tom Grzelak                          grzelak@xxxxxxxxxxxxxxxxxx
> Senior Systems Administrator
>   ----> Center for Environmental Prediction
>   ----> Department of Environmental Sciences
>
> Rutgers University
> 14 College Farm Road                    Voice: 732-932-4923
> New Brunswick, NJ 08901-8551            Fax: 732-932-8644
>                  http://www.envsci.rutgers.edu
> ===============================================================
>
>


>From owner-ldm-users@xxxxxxxxxxxxxxxx 09 2003 Apr -0400 00:08:10 
Date: 09 Apr 2003 00:08:10 -0400
From: Dan Vietor <devo@xxxxxxxxxxxxx>
In-Reply-To: <5.2.0.9.0.20030408202219.018b6740@xxxxxxxxxxxxxxxxxx>
To: Tom Grzelak <grzelak@xxxxxxxxxxxxxxxxxx>
Subject: Re: IS IT THE AVN OR GFS OR MRF OR ....?
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On Tue, 2003-04-08 at 20:31, Tom Grzelak wrote:
> 
> I have a question that I hope to gain consensus on.  In speaking with a 
> friend from NCEP over winter break, he kept reminding me on how the AVN was 
> now called the GFS.  Is it truly the same model?  Also, is the MRF now also 
> considered the GFS.

Technically, NCEP eliminated the MRF model 12 months ago.  At the same
time, they added resolution to the AVN and named it the GFS.  Currently,
NCEP still uses the old model designations in the GRIB files.  If you
look at the MRF grids out to 5 days, they match the equivalent AVN
grids.  So there is overlap.  

I've gone to naming the grids GFS/AVN and GFS/MRF for both forward and
backward compatibility.

-- 
________________________________________________________
Daniel Vietor               Mail: devo@xxxxxxxxxxxxx
Unisys Corp                 Title: Engineer/Meteorologist
221 Gale Lane               Phone: 610-925-5206
Kennett Square PA 19348     Fax: 610-925-5215

• References:
  • IS IT THE AVN OR GFS OR MRF OR ....?
    • From: Tom Grzelak