Update...
As the second squall line passed through sometime after 9 pm, the storm got very violent with rain so heavy it was near totally blinding. The weather services issued tornado warnings for southern Fairfield County. There was a lot of howling but no tornado at our home.
The worst part was very fast moving. It started and finished in under 15 minutes. At the end it was as if someone had flipped a switch and the rain was down to a gentle trickle near instantly. We did not lose our power during the worst of it.