[Wrf-users] question about "OUT OF BOUNDS" messages in fort.98

[Eric Altshuler]

Hi Carlo, 


As I recall, I did not implement any changes to address this problem because: a) my runs were not crashing, b) making the suggested change would raise other issues and complicate things. My experience with this problem was almost 5 years ago, and since then I haven't worked with WRF much. For what it's worth, I'm forwarding an email I sent to another user about this (see below). 


Best regards, 



Eric L. Altshuler 
Research Scientist 
Center for Ocean-Land-Atmosphere Studies 
253 Research Hall, Mail Stop 6C5 
George Mason University 
4400 University Drive 
Fairfax, VA 22030 USA 

E-mail: ela at cola.iges.org 
Phone: (703) 993-5725 
Fax: (703) 993-5770 


Dear Yonghui Lei, 

I got this forwarded message from Jimy Dudhia. It also includes my original message. Apparently, the OUT OF BOUNDS messages are produced by the Kain-Fritsch cumulus scheme, when the cloud top is above 50 hPa. Jimy suggested reducing the value of plutop, a variable in the source code file module_cu_kfeta.F in the 'phys' directory. Since I had already run quite a few simulations with the default value of plutop and the model top pressure at 50 hPa (p_top_requested in namelist.input file), I decided not to change anything. One obvious question is if you reduce the value of plutop, should you also reduce p_top_requested to the same value? I don't know what the answer is, because I never pursued this problem any further. You might post your question to wrf-users, so we could perhaps settle this issue more clearly. 

Best regards, 
Eric 

------------------------------------------------------------------------------------------------------------------ 

wrfhelp, 
This is probably a cloud top above 50 hPa. It may temporarily corrupt some cumulus tendencies 
in that column. Setting a lower value of plutop might help, 
Jimy 


Begin forwarded message: 

From: Eric Altshuler < ela at cola.iges.org > 
Date: April 17, 2009 2:45:06 PM MDT 
To: wrfhelp < wrfhelp at ucar.edu > 
Cc: wrf-users < wrf-users at ucar.edu > 
Subject: [Wrf-users] question about "OUT OF BOUNDS" messages in fort.98 

Hello, 

I am running WRF-ARW 3.0.1.1 over South Asia using a triply-nested domain (45km, 15km, 5km). In some runs, a file named fort.98 is written in the WRF run directory. It contains a number of messages, all of which are the following: 

**** OUT OF BOUNDS ********* 

I traced this message to a subroutine called TPMIX2 in the source code file module_cu_kfeta.F in the 'phys' directory. The block of code that produces the message is: 

IF(IPTB.GE.220 .OR. IPTB.LE.1 .OR. ITHTB.GE.250 .OR. ITHTB.LE.1)THEN 
write(98,*)'**** OUT OF BOUNDS *********' 
! call flush(98) 
ENDIF 

The model does not crash (go unstable) when these messages are produced, but I am concerned that these messages are occurring. Do they indicate that something is going wrong in the Kain-Fritsch convection scheme, or are they just diagnostic messages that shouldn't be cause for concern? 

Thanks for any feedback on this. 

Best regards, 

Eric L. Altshuler 
Assistant Research Scientist 
Center for Ocean-Land-Atmosphere Studies 
4041 Powder Mill Road, Suite 302 
Calverton, MD 20705-3106 
USA 

E-mail: ela at cola.iges.org 
Phone: (301) 902-1257 
Fax: (301) 595-9793 
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----- Original Message ----- 
From: "Yonghui LEI" < yonghui.lei at reading.ac.uk > 
To: ela at cola.iges.org 
Sent: Tuesday, November 17 , 2009 1:54:43 AM GMT -05:00 US/Canada Eastern 
Subject: WRF fort.98 question 

Hi Eric, 

I am wondering if you can give me any information about fort.98. I found 
your note, but no relevant feedback. Do you figure out what fort.98 is? I 
am keen to know if it imply any possible mistakes in WRF run. I had this 
file in my run too. Thank you very much, Yonghui Lei 
----- Original Message -----
From: "Carlo Corsaro" <c.corsaro13 at imperial.ac.uk> 
To: "wrf-users at ucar.edu" <wrf-users at ucar.edu> 
Sent: Thursday, January 30, 2014 11:38:01 AM 
Subject: Re: [Wrf-users] question about "OUT OF BOUNDS" messages in fort.98 




Dear Eric, 



I am writing to you regarding the “OUT OF BOUNDS” message that you found running WRF. Did you manage to solve this problem? 

I get the same message and my run stops at that point. 

Thanks for any advice on this issue. 

Regards, 

Carlo 
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