On Sunday at 8:59 p.m. the NWS Raleigh NC released a flash flood warning in effect until Monday at midnight for Guilford County.

Flash floods in Texas have killed at least 107 people over the Fourth of July weekend, with more than 160 still missing.

On Sunday at 6:08 p.m. the National Weather Service issued a flash flood warning in effect until 9:15 p.m. for Bedford 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.

Heads up if you're in the Hill Country or know someone who is. The threat for flash flooding in the areas devastated by last Friday's flooding have increased.

A flash flood warning was released by the National Weather Service on Sunday at 6:33 p.m. in effect until 9:45 p.m. for Huntingdon County.

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.

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.