[gradsusr] extract wind profile for plot, or wgrib2?

[Bo Zhang]

Hi great grads users:

I basically want to extract wind profile at a certain lon-lat location for a long period. As each grib2 file is for a certain time, I have to extract wind profile from multiple data files. Is there a build-in function in Grads2 do such thing? I am trying wgrib2 also, which doesn't give result I expect. 

./wgrib2 gfs_3_20090719_1800_003.grb2 -s -ij 45 45 | grep :UGRD | ./wgrib2 -i gfs_3_20090719_1800_003.grb2 -text data.txt

Based on my understanding this supposes to work but it writes the whole field instead of a single lon-lat location into the .txt file. Dump the rewrite part and just keep the reading part:

./wgrib2 gfs_3_20090719_1800_003.grb2 -s -ij 45 45 | grep :UGRD |

This does display what I want, but never rewrite into any new files. Looking for suggestions.

Bo Zhang
Dow 824,Civil and Environmental Engineering
Michigan Tech University
1400 Townsends Drive. 
Houghton, MI, 49931