[Wrf-users] Doubt regarding Wind speed measurement in WRF-ARW model

[Sam Hawkins]

Dipak,

As far as I understand, the wind speed recorded is the instantaneous
speed at that timestep.  If  you want  to  record time-averaged
variables, you can either output a history file very frequently and
average the results, or you will have to make some modifications to WRF.

Sam.

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> Today's Topics:
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>    1. Doubt regarding Wind speed measurement in WRF-ARW model
>       output (dipak sahu)
>    2. Query regarding multiple simultaneous depressions (Preeti)
>    3. Re: Query regarding multiple simultaneous depressions (Min Zhu)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 16 May 2010 00:51:33 +0530
> From: dipak sahu <dipakmath at gmail.com>
> Subject: [Wrf-users] Doubt regarding Wind speed measurement in WRF-ARW
> 	model	output
> To: wrfhelp at wrf-model.org, wrf-users at ucar.edu
> Message-ID:
> 	<AANLkTinSvaNE9yHU8PQOZO0_djX0ubjmWwrsPjZLBueK at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear sir
>    I've one doubt regarding wind speed calculation in WRF-ARW model output
> by using GrADS. I'm using WRF-ARW model since last 2-3yrs for my PhD pupose.
> Always it one doubt in my mind regading the calculation of wind speed and
> wind direction in model output through GrADS.
> 1- Suppose history interval was set in my model run as 1hr,and after
> postprocessing i want to know the wind speed at t=12th hour of forecast. So
> how it gives the value? Is it gives the instant wind speed value at that
> time or the average wind speed of some past time? Because after my model
> comparison with observation , I found that the observation wind speed and
> model wind speed has a huge gap.
>
> with regards
>
> Dipak
>
>
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> ------------------------------
>
> Message: 2
> Date: Mon, 17 May 2010 02:38:29 -0700
> From: Preeti <preeti at csa.iisc.ernet.in>
> Subject: [Wrf-users] Query regarding multiple simultaneous depressions
> To: wrf-users at ucar.edu
> Message-ID:
> 	<AANLkTinqmSb-f34v5ljoT6KC1KdKVbszuu2G4QZ7L1_U at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hello
>
> I have a question about weather phenomenon.
>
> Is the phenomenon of multiple depressions common in any part of the
> globe? Can multiple depressions occur within an area of, say, 50
> million sq km simultaneously?
>
> Thanks
> Preeti
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 17 May 2010 16:20:18 +0100
> From: "Min Zhu" <min.zhu at res-ltd.com>
> Subject: Re: [Wrf-users] Query regarding multiple simultaneous
> 	depressions
> To: "Preeti" <preeti at csa.iisc.ernet.in>,	<wrf-users at ucar.edu>
> Message-ID:
> 	<64102FE81CF56640B4AE9EEF9B0026F5CF26CF at kl-exc-001.res.lan>
> Content-Type: text/plain;	charset="us-ascii"
>
> Hi,
>
> I think it is possible that a huge depression area exists involving main
> cyclone and several secondary cyclones. 
>
> Cheers,
>
> Min Zhu
>
>
> -----Original Message-----
> From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On
> Behalf Of Preeti
> Sent: 17 May 2010 10:38
> To: wrf-users at ucar.edu
> Subject: [Wrf-users] Query regarding multiple simultaneous depressions
>
> Hello
>
> I have a question about weather phenomenon.
>
> Is the phenomenon of multiple depressions common in any part of the
> globe? Can multiple depressions occur within an area of, say, 50
> million sq km simultaneously?
>
> Thanks
> Preeti
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>   


-- 
Sam Hawkins
Institute for Energy Systems
School of Engineering and Electronics
The King's Buildings
University of Edinburgh
EH9 3JL
0131 6505612


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