It absolutely dwarfed a normal summer thunderstorm but I’d be willing to wager it’s rained harder before, but this was a totally different length of time. There were times when it was near-blinding (slightly distorted perspective because I was driving) but even then I could see. What really struck me was the fact that the downpour continued for an hour. It was like heaviest summer thunderstorm of the year going on for a whole hour. Places I’ve never seen flood flooded in 10 minutes. It also really did come in like a wall. Nothing to pouring in about 30 seconds, then whatever the step is beyond pouring in about another 30. https://www.arlnow.com/2019/07/08/flash-flood-warning-issued-for-arlington-3/