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As @gansub implicitly suggested, you may have a better outcome by defining the output grid as well. Check this very similar question: How to interpolate scattered data to a regular grid in Python? After comments, I realize I missed the irregular target grid. Maybe this answer helps: https://stackoverflow.com/questions/3242382/interpolation-over-an-...


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Same experience two weeks ago north of Charleston, SC: could very clearly see abundant lightning in the top of a distant bank of clouds east over the ocean at nighttime with no moon. It was spectacular. But the radar showed that storm to be a little over 150 miles out to sea...


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