An area in Fort Bend County was also smacked by a train of thunderstorms. Each area got 10" or more of rain in a fairly small amount of time. Thunderstorms move along the front in an anticyclonic pattern, the front slows, and the thunderstorms stack up for dumping their rain.

We do this. When we were house hunting in 2009 we kept running into flooded areas in April/May because of this exact same kind of weather pattern.

Then the tax day floods--what, 2016? And the Memorial Day flood in 2015.

It's different from what happened north of us on Friday, where the airport recorded nearly 3" of rain in something like 30 minutes. There wasn't massive flooding from that, but some streets were closed because of flooding and flooded vehicles and some schools were on weather lock-down when the dismissal bell rang.