<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12">
<TITLE>RE: [Wrf-users] Strange problem with nesting</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<BR>
<P><FONT SIZE=2>Arrgh, nevermind, I found the problem. The i_parent_start and j_parent_start arrays didn't agree between the namelist.input and namelist.wps. My bad.<BR>
<BR>
-Eric<BR>
<BR>
Eric M. Kemp<BR>
Meteorologist<BR>
Northrop Grumman Information Systems<BR>
Advisory Services Division (TASC)<BR>
4801 Stonecroft Boulevard<BR>
Chantilly, VA 20151<BR>
301-286-9768 (NASA Goddard Office)<BR>
703-633-8300 x7078 (Chantilly SLEET Lab)<BR>
703-633-8300 x8278 (Chantilly Office)<BR>
703-449-3400 (Chantilly Fax)<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: wrf-users-bounces@ucar.edu on behalf of Kemp, Eric M (IS)<BR>
Sent: Fri 9/4/2009 9:05 AM<BR>
To: wrfhelp@ucar.edu; wrf-users@ucar.edu<BR>
Subject: [Wrf-users] Strange problem with nesting<BR>
<BR>
<BR>
Dear WRF users,<BR>
<BR>
I'm experiencing a strange problem with WRF when nesting is used. For certain<BR>
grid configurations, using nesting will cause some fields (e.g., terrain) to<BR>
shift eastward in parts of the domain. In one case so far, the offset is<BR>
clearly rectangular. I have tested both single and multiple cpus with Intel<BR>
MPI, and I haven't noticed any difference in the way the fields are offset.<BR>
Has anyone encountered this in their work? Note that the dimensions of the<BR>
inner-grid match the requirements mentioned in the User's Guide, i.e., (nx-1)<BR>
and (ny-1) are divisible by the parent_to_grid_ratio.<BR>
<BR>
I've attached the namelist.wps and namelist.input. I also have a PNG file of<BR>
the terrain field (plotted with RIP) illustrating my problem, but it's too big<BR>
(55K) to post to the list; I can try uploading it to a FTP site.<BR>
<BR>
<BR>
-Eric<BR>
<BR>
Eric M. Kemp<BR>
Meteorologist<BR>
Northrop Grumman Information Systems<BR>
Advisory Services Division (TASC)<BR>
4801 Stonecroft Boulevard<BR>
Chantilly, VA 20151<BR>
301-286-9768 (NASA Goddard Office)<BR>
703-633-8300 x7078 (Chantilly SLEET Lab)<BR>
703-633-8300 x8278 (Chantilly Office)<BR>
703-449-3400 (Chantilly Fax)<BR>
<BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>