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20050901: Analysis/forecast stamp query in re: RUC/Conduit

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  • Subject: 20050901: Analysis/forecast stamp query in re: RUC/Conduit
  • Date: Thu, 01 Sep 2005 12:28:27 -0600
John,

The RUC is run hourly. The CY.19 is the 19Z cycle, which will
have analysis (F000) through F003. The file shown below has 
fh.anal, which will be a F000 grid for the 19Z run.

The RUC provides extended runs every 3 hours, eg the 18Z and
21Z runs would go from F000 through F012.

Steve Chiswell
Unidata User Support




>From: John Merrill <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200509011822.j81IMpjo005085

>Hello,
>   (We're now using GDPOINT, having compiled the V 8.3 release. This
>is a helpful program for what I'm working on at present.)
>   I inquire about some specific forecast hour characteristics for .gem 
>files prepared from the Conduit data stream. I'm confident that this
>is actually a question about RUC analysis/forecast cycling, not a Gempak
>question, but I suspect you'll know the answer.
>
>We used dcgrib2 to prepare a file for 1900 UTC on a particular date
>in July of 2004. GDINO for one of the grids tags it as F0000. This
>surprised me because I read that the model is initialized at 3 hour
>intervals, so I'd expect a 1900 UTC field to be a 1 hour forecast.
>
>Similar characteristics are present now. Here is a URL from the Conduit
>Web site:
>
>raw/conduit/SL.us008001/ST.opnl/MT.ruc_CY.19/RD.20050831/PT.grid_DF.gr1/fh.ana
> l_tl.press_gr.us20km
>
>grib_ncep_RUC2_#252_200508311900_F000_HGT_125_mb
>
>I see that this is a 00 hour forecast for 1900 UTC. Can you clarify for 
>me? Thanks.      John
>
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