[Wrf-users] NMM offline nesting problems

[Eduardo Penabad Ramos]

Hello,

I'm trying to nest into a previous generated NMM output a finer domain. 
In order to do so, I'm postprocessing d01 original output with WPP, then 
I obtain a GRIB file that I can use as initial and boundary condition 
file for the new domain02 run. (I'm using Vtable.NAM to ungrib that file)

I'm facing some troubles with this scheme. Here it is the landmask of my 
d02:



I run metgrid and real_nmm.exe succesfully, but when I run wrf, after 
the first iterations I obtain NaN values over the land points. This 
values appear not just in the surface nor in the whole column, for 
instance here it goes two plots of  v-wind variable at wrfout file at 
the first vertical level (upper row) and the upper vertical level 
(bottom row), at the initialization time (left column) and after 3 
iterations (right column):



Moreover, I've observed some inconsistencies betwen the "landsea" (from 
the GRIB file of the previous d01 run) and the "landmask" (from geo_nmm 
of domain02) contained in met_nmm files. In addition to some expected 
differences between this 2 variables, it looks like land is displaced by 
some kind of spatial shift from northwest to southeast.



Does anybody have any advice on where could it be the problem of these 
issues? Thanks in advance.

Eduardo Penabad
MeteoGalicia. NWP Dept.




-- 
MeteoGalicia
     Eduardo Penabad Ramos
     Dpto. Predición Numérica e Investigación
  	Rúa Roma, 6
15.707 Santiago de Compostela
	Tel: +34 981 957 462
Fax: +34 981 957 466
edu.penabad at meteogalicia.es <mailto:edu.penabad at meteogalicia.es>
www.meteogalicia.es <http://www.meteogalicia.es/>

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