[Wrf-users] GFS data

[Hein Zelle]

Dear Gisele dos Santos Zepka,

> I need to run WRF for 24 hours using 0.5 deg GFS data (analysis from
> 12 UT + 24 forecasts). So, my first GFS file is gfs.t12z.pgrb2f00
> (that I believe to be the analysis) to gfs.t12z.pgrb2f24 every 3
> hours. I don't know if these are the right files to use. 

The f00 files are always the analysis files.  The f-number indicates
the number of hours since the analysis, for each forecast.  The number
after the t (t12z) is the "cycle": the UTC hour when the forecast was
started.

So, a file called gfs.t12z.pgrb2f00 is the analysis for the forecast
which starts at 12UTC.  The file gfs.t12z.pgrb2f12 is a 12-hour
forecast valid for the following midnight, 00:00 UTC.

Each gfs file contains only 1 "time step".

There are 4 forecast "cycles" per day, so you'll see files labeled
t00z, t06z, t12z and t18z.

Kind regards,
     Hein Zelle

-- 

Dr. Hein Zelle
Advisor Meteorology & Oceanography

Tel:    +31 (0)527-242299
Fax:    +31 (0)527-242016
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