<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000'>Hello David,<div><br></div><div>In the WPS code, all namelist variables are initialized to default values before the namelist is read in. If a namelist variable is not assigned a value in namelist.wps, it will retain its default value. In some cases, the default value is "crazy" (e.g. larger than any conceivable valid value for that variable, as is the case with ref_x and ref_y). There's no need for you to specify these variables unless your reference point is not at the center of your coarse domain.</div><div><br></div><div>Best regards,<br><br><div><span name="x"></span>Eric L. Altshuler<br>Research Scientist<br>Center for Ocean-Land-Atmosphere Studies<br>253 Research Hall, Mail Stop 6C5<div>George Mason University</div><div>4400 University Drive<br>Fairfax, VA 22030 USA<br><br>E-mail: ela@cola.iges.org<br>Phone: (703) 993-5725<br>Fax: (703) 993-5770</div><span name="x"></span><br></div><br><hr id="zwchr"><b>From: </b>"David Smith" <dsmith@uvi.edu><br><b>To: </b>"wrf-user-list" <wrf-users@ucar.edu><br><b>Sent: </b>Thursday, August 15, 2013 3:21:53 PM<br><b>Subject: </b>[Wrf-users] ref_x and ref_y in geogrid<br><br>
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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi,<br>
<br>
In geogrid, when I leave ref_x and ref_y as default, the geogrid.log shows astronomically large numbers,
<br>
<br>
REF_X = 100000002004087734272.000000<br>
REF_Y = 100000002004087734272.000000<br>
<br>
so I have set them to the correct values (20 and 23 respectively). It seems to make no difference in the successful execution of geogrid, but why are the default values
<font face="Tahoma"><span style="font-size: 12pt;">(</span><span style="font-size:11.0pt">E_WE</span><span style="font-size: 12pt;">/2 and
</span></font><font face="Tahoma"><span style="font-size: 12pt;"><font face="Tahoma"><span style="font-size:11.0pt">E_<font face="Tahoma">SN</font></span><span style="font-size: 12pt;">/2</span></font>)</span><font face="Tahoma"> rid<font face="Tahoma">i</font>culously
wrong numbers?</font></font> Does this indicate I have something disturbingly wrong somewhere or is this just an artifact? I've posted the namelist.wps below. Thanks!<br>
<br>
&share<br>
wrf_core = 'ARW',<br>
max_dom = 3,<br>
start_date = '2013-08-12_00:00:00','2013-08-12_00:00:00','2013-08-12_00:00:00'<br>
end_date = '2013-08-12_18:24:00','2013-08-12_18:24:00','2013-08-12_18:24:00'<br>
interval_seconds = 10800<br>
io_form_geogrid = 2,<br>
/<br>
<br>
&geogrid<br>
parent_id = 1, 1, 2, 2<br>
parent_grid_ratio = 1, 3, 3, 3<br>
i_parent_start = 1, 10, 10, 3<br>
j_parent_start = 1, 10, 10, 21<br>
e_we = 40, 61, 118, 88<br>
e_sn = 46, 76, 163, 56<br>
geog_data_res = 'modis_30s+10m','modis_30s+2m','modis_30s+30s','30s'<br>
dx = 9000,<br>
dy = 9000,<br>
map_proj = 'lambert',<br>
ref_lat = 18.08,<br>
ref_lon = -64.635,<br>
truelat1 = 16.0,<br>
truelat2 = 20.0,<br>
stand_lon = -65.0<br>
geog_data_path = 'geog'<br>
/<br>
<br>
&ungrib<br>
out_format = 'WPS',<br>
prefix = 'FILE',<br>
/<br>
<br>
&metgrid<br>
fg_name = 'FILE'<br>
io_form_metgrid = 2, <br>
/<br>
<br>
<br>
<br>
</div>
<br>_______________________________________________<br>Wrf-users mailing list<br>Wrf-users@ucar.edu<br>http://mailman.ucar.edu/mailman/listinfo/wrf-users<br></div></div></body></html>