Future Forecast Settings

Discuss advection schemes, timestepping, pressure gradients, coordinates, etc.

Re: Future Forecast Settings

Postby anu » Fri Sep 13, 2013 2:51 am

so,, u can kindly show me a sample of both the files for better understanding and clarity of parameter input in both the files
anu
 
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Re: Future Forecast Settings

Postby JP26 » Tue Jan 26, 2016 9:22 pm

bluefish1188 wrote:
Phillip wrote:If you don't run the model globally your domain has boundaries which are affected by the conditions outside of the domain. As a result, you need information for either the boundary (which is contained in the boundary files) or you have to simulate the outside. The only domain which does not require boundary files is one covering the whole earth, since it is periodic.

In other words: If you want to run the model without initial data for all time steps you have to do a global run. Inside the global simulation you can nest smaller domains for downscaling. Initializing a global run only requires one time step of global input data.

Where is your domain located and how large is it?

Check this page for information on how to start a global run:
http://www.mmm.ucar.edu/wrf/users/docs/ ... htm#global
It's the chapter of the WRF manual which explains how to start a global run.


Hi,I have a question about the forecast time.
I think that forecast in WRF model should be started from one known time peroid . for example, I have the dataset(gfs ) donwload from website , the start time is 2009-1-1_00 and the end time is 2009-1-2_00. I want to forecast 2009-1-3 ,1-4.......etc. But I expected the forecast happen in the region , not global .

in other word ,I want to know whether WRF model needs to setting the range of time exceeding the date of input data.


Hi everyone,

I have the same question:

I want to do a forecast with the WRF. If i have dataset where the start date is 2011-01-02_00 and the end time is 2011-01-03_00 and i want to forecast 2011-01-04 ... How can I do that? Can I use the GFS data?

regards
JP26
 
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Re: Q: Future Forecast Settings

Postby JP26 » Tue Jan 26, 2016 9:33 pm

anu wrote:Hi, i want to do a future run of wrf.
i have gfs data till 2013-06-17:00 i want to forecast ,,,
can someone help me with sample namelist.wps and namelist.input in order to understand how to provide start date and end date and global boundary and nest domain in order to run for forecasting.


Hi anu,
I want to do a forecast with the WRF but i don't know how to provide start date and end date and global boundary?
What kind of data i need? GFS data is ok?
can youhelp me with sample namelist.wps and namelist.input? in other words how can i do a forecast wint the WRF? :)
JP26
 
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Re: Future Forecast Settings

Postby Phillip » Mon Feb 01, 2016 6:20 am

JP26 wrote:Hi everyone,

I have the same question:

I want to do a forecast with the WRF. If i have dataset where the start date is 2011-01-02_00 and the end time is 2011-01-03_00 and i want to forecast 2011-01-04 ... How can I do that? Can I use the GFS data?

regards

What is the dataset that you have? If you want to run the simulation until 2011-01-04 you need data which reaches up to the last time step you want to simulate. You can not simulated time steps later than your last input file.

You can use GFS data, but you will need the files for the entire 3 january and the file for 4 january 00 UTC to do it. So if you want to run a simulation from 2011-01-02_00 until 2011-01-04_00 you would need the files for:

2011-01-02_00
2011-01-02_03
2011-01-02_06
2011-01-02_09
2011-01-02_12
2011-01-02_15
2011-01-02_18
2011-01-02_21
2011-01-03_00
2011-01-03_03
2011-01-03_06
2011-01-03_09
2011-01-03_12
2011-01-03_15
2011-01-03_18
2011-01-03_21
2011-01-04_00

You can also use one file every six hours but you can not run a limited area model any longer than until the time of your last input data file. That's only possible with a global model. In this case the model could not be run any longer than until 2011-01-04_00.
Phillip
 
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Re: Future Forecast Settings

Postby Abhishek sharma » Thu Dec 08, 2016 5:50 am

hello everyone,
I have one question
question: After global run, ca we downscale it to area of interest domain?
Abhishek sharma
 
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