Here's what to know about the deadly flooding, the colossal weather system that drove it and ongoing efforts to identify victims.

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.

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 Flood Watch covers most of the state, barring some counties in northwestern and southeastern Oklahoma, through at least Sunday afternoon.

The National Weather Service released a flash flood warning at 1:17 p.m. on Saturday in effect until 3:45 p.m. for Franklin and Hampshire counties.

Straighter, smoother streams flow more violently than those that meander due to a reduction in friction. Areas with steeper terrain can see water accelerate downhill at a much faster rate causing a more destructive flash flood than flatter, open areas.

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. And there’s no more dangerous time for a flash flood than after dark;

A study puts the spotlight on Texas as the leading U.S. state by far for flood-related deaths, with more than 1,000 of them from 1959 to 2019