Wow, you're really getting killed by the rain. We had 1.31" yesterday/this morning. We also had a downburst. Lots of trees and powerlines down in about 1 x 4 mile area. I purposely drove into it as I close to it when I saw it on the velocity scan. A tree came down across the road I was on about a minute after I passed it. Here is part of my dashcam video. The first part is the shelf cloud (sped up slightly) and the last part is driving into it. No audio at first and the last couple minutes is me driving into the abyss, to which the video doesn't do justice. Most of the time, I could only go about 10 MPH.