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Windguru- wrf27 vs gfs27

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shutupjoy
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Windguru- wrf27 vs gfs27

Postby shutupjoy » Tue Sep 26, 2017 5:01 am

Hi all, wondering what is the different between those two models.
Both of them shows forecast for 27km radius. So what is the different?

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Re: Windguru- wrf27 vs gfs27

Postby Lokihel » Tue Sep 26, 2017 5:12 am

(If I am not mistaken it is a 27km grid, not radius.)


They are two different models, that's all.
Each is run by a different body. It's Google vs Bing if you want, same thing, different brand.
Each has its strong and weak points. Just compare the forecast with the actual conditions and you'll soon learn which is more accurate for each weather pattern, and how to apply your own correction factors.

shutupjoy
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Re: Windguru- wrf27 vs gfs27

Postby shutupjoy » Tue Sep 26, 2017 6:35 am

Lokihel wrote:
Tue Sep 26, 2017 5:12 am
(If I am not mistaken it is a 27km grid, not radius.)


They are two different models, that's all.
Each is run by a different body. It's Google vs Bing if you want, same thing, different brand.
Each has its strong and weak points. Just compare the forecast with the actual conditions and you'll soon learn which is more accurate for each weather pattern, and how to apply your own correction factors.
Ok thank you.
What about the 9km model? is it more density for less grid? is it more reliable for the next two days than the 27km?

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Re: Windguru- wrf27 vs gfs27

Postby Lokihel » Tue Sep 26, 2017 8:49 am

9 km means less space between points, denser grid.


Basically at each grid point the model calculates the conditions. In other words, on a 27 km grid, the conditions are calculated every 27km. In reality there are areas where the grid is tighter than others, but the basic idea is there.


In theory the 9 km model should be more accurate, but it is not a guarantee. There is a lot more to the model than the grid spacing.
Up to now, the GFS 27 km has been more accurate in the Indian Ocean than the ECMWF 9 km, although the grid is a lot less dense.


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