[gradsusr] Streamfunction (fish_psi)

[James Spinks]

Hello,

I'm having some trouble using the fish_psi function to plot streamfunction for the GFS data.

'open gfs.ctl'
'd fish_psi(ugrdprs,vgrdprs)'

The field is returning constant value 0 or -inf.

Interestingly enough, I use to be able to plot streamfunction using fish_psi with no problem for the GFS. So this 'bug' has occurred over the last few months or so.

Anyone have any ideas what may be causing the problem with the GFS data? I have use the function fish_psi just fine using the ECMWF-interim data. 

I'm using grads-2.1.a2.oga.1

Thanks,
James Spinks
 		 	   		  
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