2-way nest question: Offset in Timing?

[nobleeu]

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

[jimmyc]

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.

[nobleeu]

Thanks.
The WRFhelp group also mentioned that my data isn't affected by this.
Good thing.