The same dangerous atmospheric setup — intensified by climate change — spurred the back-to-back devastating deluges in St. Louis and eastern Kentucky.
But all flash floods share one thing in common — so much rain falls that systems designed to safely divert water are overwhelmed.
This week, the atmospheric pattern in place over the Mississippi and Ohio valleys proved supportive of exceptionally heavy rain that displayed unusual persistence. The journey of the sopping air hit a roadblock, however, in a stationary weather front stretched from Kansas to Virginia, which overlaid a dome of excessively hot air sprawled over the Southern United States.All of the atmospheric moisture began to pool near this stalled boundary, day after day. Eventually, the amount of moisture grew to near-record levels.
As storms developed along the front, evening after evening, they drew energy from an atmosphere that was very unstable and very wet, and they dropped rain with incredible ferocity. And because the high-altitude winds that dictate the motion of thunderstorms were blowing parallel to the front, the downpours moved over the same areas for hours, one after the other.
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