why I got 9.999e+20

[Shih, Jhih-Shyang]

Dear Experts:

 

I download NARR grb files and extract following subregion:

 

            Lon:     -91.5 (W)         -78.0 (E)

            Lat:      42.5 (North)    32 (South)

 

Variables (tmpprs, hgtprs, ...) within part of the subregion (within the
US) have value of 9.999e+20, which means undefined I believe.  My
question is why it is undefined?  What is the cause?

 

Thanks very much.

Jhih-Shyang

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