[Wrf-users] trouble with 2-way nest

[John Krasting]

Dear Matt,

I am now trying to run WRF with the NARR data and I've encountered the exact
same problem that you had back in October.  Have you been able to make any
progress on this problem or do you have any new advice I could try?

Thanks,
John Krasting
Rutgers Univ.


On 10/17/05, John Krasting <krasting at cep.rutgers.edu> wrote:
>
> I can't help you very much, but I encountered the problem with a
> 12km/4km two way nested run using GFS data.   I also played with the
> time step by it didn't help.  I changed my resolution to 15km/5km and
> the problem resolved.   I never figured out why WRF didn't like the
> 12km/4km configuration.
>
> -John
>
> On 10/17/05, mpborkow at ncsu.edu <mpborkow at ncsu.edu> wrote:
> > I am running a two-way nest, 12km outer domain with a 4km inner domain
> > using a NARR dataset.  The setup seems to be fine but I am having
> trouble
> > with the model run itself.  I do get one ouput file for each domain for
> > the initialization time only.  The SLP from these output files match up
> > well with the reanalysis data in some spots, in other spots the SLP
> seems
> > very artificial with the isobars looking erratic.  Here is a sampling of
> > the errors I am getting:
> >
> > Timing for Writing wrfout_d01_2004-03-16_00:00:00 for domain        1:
> > 21.71200 elapsed seconds.
> > Timing for processing lateral boundary for domain        1:    5.28800
> > elapsed seconds.
> >  WRF NUMBER OF TILES =   1
> >          90190  points exceeded cfl in w_damp
> > (module_big_step_utilities_em.F)
> >   MAX AT i,j,k:           174           60           30  cfl,w,d(eta)=
> >         nan             nan   2.1000000E-02
> > Timing for Writing wrfout_d02_2004-03-16_00:00:00 for domain        2:
> > 18.27400 elapsed seconds.
> >  WRF NUMBER OF TILES =   1
> >          21257  points exceeded cfl in w_damp
> > (module_big_step_utilities_em.F)
> >   MAX AT i,j,k:             5           55           30  cfl,w,d(eta)=
> >         nan   3.5428979E-02   2.1000000E-02
> >          41992  points exceeded cfl in w_damp
> > (module_big_step_utilities_em.F)
> >   MAX AT i,j,k:            10           55           30  cfl,w,d(eta)=
> >         nan   5.5973802E-02   2.1000000E-02
> >
> >  -------------- FATAL CALLED ---------------
> >  FATAL CALLED FROM FILE:  module_cu_kfeta.b  LINE:    2054
> >  KAIN-FRITSCH, istop=1, diags
> >  -------------------------------------------
> > [4] MPI Abort by user Aborting program !
> > [4] Aborting program!
> >
> >
> > My first thought was that it was a time step issue, but my time step is
> > set at 60s for the 12km domain, 20s for the 4km domain.  I did try
> > reducing them to 48s and 16s, but this did not solve the problem.  Given
> > the final error, looks like there may be some error with the
> KAIN-FRITSCH
> > scheme, which I only have running on the 12km domain.  Does anyone have
> > any thoughts as to what the problem may be?  Thanks!
> >
> > -Matt
> >
> > _______________________________________________
> > Wrf-users mailing list
> > Wrf-users at ucar.edu
> > http://mailman.ucar.edu/mailman/listinfo/wrf-users
> >
>
>
> --
> ****************************************************
> John Krasting
>
> Center for Environmental Prediction
> Rutgers University
> 14 College Farm Road
> New Brunswick, NJ  USA 08901-8551
> Phone:  +1-732-932-3890
> Fax:  +1-732-932-8644
> ****************************************************
>



--
****************************************************
John Krasting
Meteorologist, Graduate Assistant
Center for Environmental Prediction
Department of Environmental Sciences
Rutgers University
ENRS Building, Room 201
14 College Farm Road
New Brunswick, NJ  USA 08901-8551
Phone:  +1-732-932-3890
Fax:  +1-732-932-8644
Email:  krasting at envsci.rutgers.edu
****************************************************
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