By Meteorologists Chris Dolce, Briana Waxman, CNN(CNN) — Significant flash flooding is underway from the Midwest to the central Appalachians and more drenching downpours are incoming. Here’s the latest:Flash flood emergency: Several water rescues were reported in Crooksville, Ohio, in Perry County, according to CNN affiliate WBNS. A rare flash flood emergency – the highest level of flash flood warning – was issued there early Tuesday after about a month’s worth of rain fell in 3 hours. Multiday flood threat: Flood watches have been issued for more 20 million people in the Ohio Valley and central Appalachians. Flood watches have been issued for more 20 million people in the Ohio Valley and central Appalachians.