Extracting a dataset from GFS GRIB

[Qalupalik]

Hallo,

 

Is there any guidance on how one should go about extracting wind velocity vectors from an upper air dataset contained in an historical GFS GRIB over a given region? I have access to a copy of Matlab and should prefer if the raw data could be output to an Excel file if it's possible.

 

Would appreciate any tips.

 

Thanks.

 

Weirp

[Waterspout]

The Wind dataset in a GRIB file should be stored as 'U' and 'V' components.

 

Extracting the Speed is then SQR(U^2 + V^2)

 

Extracting the Direction a bit more complex:

 

(180 / PI) * ATN( U / V)

 

But then adjust the angle relative to North as follows:

 

If V > 0 Add 180

if U>0 and V<0 Add 360

[Trader]

Waterspout or anyone else,

 

Do you have a direct link to the ECMWF model run GRIB files? or GFS?

Looking for the Tmax and Tmin at 2M.

 

 

Thanks

Edited August 16, 2014 by Trader