It was always too low. I'd be measuring diligently, "Oh, 11.2 storm total, nice!"
Four hours later...BDR, eh 7.0" sure.
There might be a difference at times with their location, but I could drive down and stick a ruler in for 10" after such a report came in. It got to be comical at times and felt like they did it well after all was said and done. And who knows where they were measuring at other times...