It’s rare that we see random summertime storms produce the type of flash flooding we saw Sunday.
So why did it happen?
Temperatures around 93 degrees helped produce multiple storm cells over the Tri-State. In some cases, the thunderstorms' movement was stationary or very slow, at 10 mph.
GALLERY: See photos of flooding, damage
Our air was supersaturated with moisture and high dew points in the 70s.
This tropical flow interacted with high pressure to the east. The high pressure forced the storms right over the top of us, creating what we call a "ring of fire." We were outside the ring of high pressure where thunderstorms fire up, resulting in flash flooding all across the Tri-State.
Some 3 to 5 inches of rain fell in such a short period of time that, clearly, our grounds could not soak it all up.
Torrents of rain falling from the sky collecting on concrete and asphalt created the perfect flash-flood storms.