Thanks for the input — my grass is fine, it’s my perennials and annuals that are my biggest concerns. Yes, a close weather station is the best for getting the nearest to what my actual rainfall was. The rain sensor is just a good double check to keep from watering if I got rain that the weather station didn’t get. But the rain sensor has nothing to do with this problem — the problem is that weather forecasts are for general areas and are best guesses. And the rain is spotty.
Also, surprisingly, not all of the Charlotte area is hard clay – According to the USDA Web Soil Survey Site, my soil is half CeD2 Cecil sandy clay loam and half EnB Enon sandy loam.