[Wrf-users] Fw: WRFDA

Asnor Muizan Ishak asnorjps at yahoo.com.my
Mon Jun 14 05:19:15 MDT 2010

Dear Dr Feng Liu,

According to the WRFDA manual, the obs radar and obs ascii are the main input files for WRFDA. But I do not know how to convert the radar data and gauge data to WRFDA format (obs radar and obs ascii respectively). Any thought on how to fix this problem? 

With best wishes,

Dear All, 
I have used the WRFDA with the online tutorial. However, now i have tried to make use the nimrod radar data as a input to WRFDA. The problem is how to convert this nimrod data to obs.radar and obs.ascii files. I noticed that these two files are the inputs to WRFDA. Am I right? The second question is how to get the data of reflectivity, beam height and so on.....Do you have any ideas on these issue? 
With many thanks in advance.


From:Feng Liu <fliu at mag.maricopa.gov>
To: Aijun Xiu <aijun at email.unc.edu>; wrf-users at ucar.edu
Sent: Wednesday, 9 June 2010 22:49:19
Subject: Re: [Wrf-users] terrain height

Hi, Aijun,
The terrain height over Pacific ocean should be zero for open sea or
positive for some islands. Some settings in your model might be wrong
otherwise. However, terrain height may go negative over inland, for
example, Imperial Valley (California), it is almost entirely below sea
level-235 feet (72 metres) below at the edge of the Salton Sea, and
Turpan Valley in Xingjiang, China, is below sea level 150 meters at the
lowest area. I wonder if you check the locations of negative terrain
heights and see if they are located somewhere such as Imperial Valley.
Hope this will be helpful.

-----Original Message-----
From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On
Behalf Of Aijun Xiu
Sent: Wednesday, June 09, 2010 10:13 AM
To: wrf-users at ucar.edu
Subject: [Wrf-users] terrain height

  Is there anyone out there noticed the terrain height can go negative 
over Pacific ocean? Is this
normal or we didn't run the model correctly? Thanks in advance if you 
can share your experience
and thoughts.

Aijun Xiu, Research Associate Professor      Phone: 919-966-2064
Institute for the Environment                Fax :  919-843-3113
University of North Carolina at Chapel Hill  Email: aijun at email.unc.edu
Bank of America Plaza, CB# 6116
137 E. Franklin St., Room 657
Chapel Hill, NC 27599-6116

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