2-way nest question: Offset in Timing?

Discuss the nesting capability within the model itself and any problems you might have run into.

2-way nest question: Offset in Timing?

Postby nobleeu » Fri Jan 22, 2010 4:50 pm

When a user chooses to do a 2 way nest, is there an offset in timing in the results?

For example I have two resulting files from a 2-way nested WRF run:
wrfout_d01_2006-09-12_00:00:00
wrfout_d02_2006-09-12_00:00:00

In my namelist.input I have the history_interval = 180, 180,
After the simulation, when I do the "ncdump -v Times " command on
either of the wrfout files, i get

data:

Times =
"2006-09-12_00:00:00",
"2006-09-12_03:01:18",
"2006-09-12_06:02:36",
"2006-09-12_09:00:12",
"2006-09-12_12:01:30",
"2006-09-12_15:02:48",
"2006-09-12_18:00:24",
"2006-09-12_21:01:42",
"2006-09-13_00:03:00" ;
}

You can see that the resulting timing is a little off. Is this normal?
Thanks ahead of time.
-Erik
nobleeu
 
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Re: 2-way nest question: Offset in Timing?

Postby jimmyc » Fri Jan 22, 2010 11:26 pm

Its normal, but only because the 2nd domain timestep must not be compatible with being even for the same output times as the parent domain. Not sure how to get around this without changing the timestep for domain2.
The views expressed in this message do not necessarily reflect those of NOAA or the National Weather Service or the University of Oklahoma.
James Correia, Jr
jimmyc
 
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Joined: Tue Apr 15, 2008 1:10 am

Re: 2-way nest question: Offset in Timing?

Postby nobleeu » Sat Jan 23, 2010 5:50 pm

Thanks.
The WRFhelp group also mentioned that my data isn't affected by this.
Good thing.
nobleeu
 
Posts: 3
Joined: Fri Jan 22, 2010 4:39 pm


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