Error in running OBS nudging

[Naser]

Hello,

I am trying to run WRF OBS nudging. After I made OBS_DOMAIN101, I transferred it to the WRF running directory. Then, I added these lines to my name list based on ARW user guideline 3.9.
&fdda
obs_nudge_opt = 1, 1,
fdda_start = 0., 0.,
fdda_end = 360., 1800.,
obs_twindo = 0.66667, 0.66667,

&time_control
auxinput11_interval_s = 3600,

I've got this error.
FATAL CALLED FROM FILE: wrf_fddaobs_in.b LINE: 1161
wrf_fddaobs_in: in4dob STOP 122

Any body knows how can I fix this?

Thank you

 

[kwerner]

Hi,
After looking into the code a bit, from what I can tell, this error happens when you have more observations than is assigned to "max_obs." Since you don't have that set in the &fdda section of the namelist.input you attached, I believe max_obs will defer to the default value of zero. Can you let me know what happens if you add something like "max_obs = 100" (or if you know how many observations you have, you can use a value a bit larger than that to see if that will get you past this error.

 

[Naser]

Dear Kwerner,

Hi, and Happy New Year!

Apologies for my late reply.

I have solved my problem and successfully run FDDA. My original data is hourly, so I was able to run WRF-FDDA based on hourly data. Since I am using obsgrid.exe to create OBS_DOMAIN data and need data at a sub-hourly interval, I attempted to run obsgrid with a 10-minute interval and adjusted the namelist interval to 600. However, obsgrid shows an error despite this change.

I would like to know if obsgrid can only run with hourly data or if it is possible to run it at intervals shorter than an hour.

I hope I have explained my issue clearly.

I look forward to your response.

Thank you,
Naser

 

[kwerner]

Hi Nasar,
I'm glad to hear your issue is solved, and I believe you should be able to run obsgrid with less-than-hourly data. Since that's a new question, will you create a new thread with the details, and share the namelist and error files when you do. Thanks!