[gradsusr] how to calculate divergence of water vapor?

[Kishore Ragi]

Dear grads users,

I would like to see if the water vapor is diverging/converging from a
specific region  in monthly averages for about an year . But, I don't know
how to calculate it using grads.

Could you anybody give some insight into it?

Thank you in advance,

Yours sincerely,

Kishore
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