A: PWAT (Precipitable Water) in the air was very high. For example: when you hear a weatherperson on TV say 'There's 1 inch of water in the air', that means that if all the air were compressed in a column space, there would be one inch of water in that column. Today's storms had upwards of 1.5 inches, producing very heavy rain.
Q: Was this a derecho, like earlier this month?
A: No. Derechos are high-wind events that stick around for at least a few minutes and produce damage. Today, there were only a few reports of 50-60 mph wind reports at max.
Q: I saw a cloud that looked like a bowl upside down. What was that?