[gradsusr] Cannot contour grid - all undefined values

[Rocco Custer]

Hi,
I am trying to load the attached files in GRADS.
I load the ctl file, I set time from 1 to 30 ("set t 1 30"), and then I try to display the variable flow ("d flow").
As a result I get 30 lines saying "Cannot contour grid - all undefined values"
I attached a screen shot of the GrADS prompt window.

If anyone could help me that would be greatly appreciated. I am very new to GrADS and I basically have no clue.

Many thanks
Rocco
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