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I'm having trouble accumulating precipitation properly (using the NAM from the Motherlode THREDDS). I'm using the Formula > Grids > Time Steps functions, and getting weird results. I assume this is because the NAM accumulates 3-hourly precipitation, but doesn't "reset" until every 12th forecast hour... so the accumulation function is adding up everything in between and giving values way too high. I tried selecting each individual 12th forecast hour, but that doesn't seem to work for some reason. Any ideas? Best Regards, Robert Dewey
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