I was at Hersheypark that day. There was hours of continuous, distant thunder but it never rained. Around 2:30 our son texted me and said how horrible things were in Mount Joy, where he worked at the time. He screenshot an image of my weather station showing 6.11" at home, but the Mt. Joy- Manheim corridor had between 8-11" of rain.
@Jns2183 this would be roughly 10-12 miles from Sunday night's event.