In the Midwest, quarter-sized hail and an isolated tornado cannot be ruled out, while in the South, flood alerts are in effect for areas that were devastated by flash floods last week.

The National Weather Service in Pueblo issued a flash flood warning Saturday evening for Costilla and Huerfano counties in southern Colorado. The impacted area is about 35 miles north of the New Mexico state line.

A flash flood warning was released by the National Weather Service on Saturday at 8:22 p.m. in effect until 11:30 p.m. for Somerset County.

Scholars and designers of early warning systems say that there are still huge gaps in our ability to predict flash floods and warn those at risk.

Back-to-back flooding disasters in recent years — in Texas, New Mexico and Kentucky, among many others — have showed that preparing for flash flooding is a new necessity as the planet warms.

The National Weather Service released a flash flood warning at 7:31 p.m. on Saturday in effect until 11:30 p.m. for Delaware County.

Much of the Oklahoma City metro is under a Flash Flood Warning until 7 p.m. on Saturday, July 12, according to the National Weather Service in Norman. 3:15 PM- A Flash Flood Warning is in effect for much of the OKC metro, including Oklahoma City ...

A flash flood is a rapid rise of water along a stream or in a low-lying urban area, the National Weather Service said. Flash flooding can result from slow-moving thunderstorms, from numerous thunderstorms that develop repeatedly over the same area, or from heavy rains associated with tropical cyclones.