NWS shows over 6-1/2” @ Will Rogers airport, and there’s an area to the SE of Norman that evidently got a lot more than that. Granted that last is an estimate (radar ap) rather than an actual measurement like NWS, but, Mesonet shows a lot of heavier rain SE of Norman too. So, there must have been some spots that got several inches of rain pretty quickly. I can believe it: A bit south of me, near Mayfield KY, last summer, NWS had an official recording of 11.28” in 13 hours.
Now that is heavy rain. The heaviest rain I’ve seen in Oregon was a widespread thunderstorm back in 1978 where we got about 6 inches in 3 hours.
My parents trailer park streets were flooded with 6 inches of water (I measured it) because the storm drains had been clogged by all the large bark chunks washing off peoples flower beds. The water went right down after I got there and cleared the drain grates.
Mesonet missed it pretty badly and they are in Norman.