I learned something new today. “Mega-Rain” is apparently an official metrological term for a storm that produces six inches of rain or more over roughly 1000 square miles.
The July 25-26 event over southern Minnesota is the first in the state since 2016.
https://www.dnr.state.mn.us/climate/journal/southern-minnesota-mega-rain-july-25-26-2020.html