I drove through an F0 tornado in New Jersey a few years ago when I went back for a visit. The rain was blinding, and it was scary as hell.
I don’t now how strong it was but I got caught on I-85 just outside Greensboro, NC in a tornado in the mid ‘80s. Like you, I couldn’t see a thing because there was so much rain. Scary when you can’t see where it is but you know it’s close because you can hear it. *shiver*