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Why does Kriging give me polka dots on my map?

Question asked by gdjones831 on Sep 25, 2014

I am trying to create a surface map based on point data I have for the USA.  I have 4800 datapoints for the lower 48 states in the US and the points are well distributed across the entire area.  I used the kriging tool to interpolate between the points, but the output map is very splotchy and is full of spots/circles.  It is a terrible map and completely unrealistic.  I used all the default settings for the analysis.  I've attached 2 images: one of the resulting map and one of the parameters. 

 

How to I get a smooth map without the circles?  Based on the data I have, how do I choose the best settings to run the analysis?

 

Thank you very much for your time and help.

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