The NWS warned of significant flash flooding through 7 p.m Wednesday.

An extreme flood scenario is underway Wednesday morning in Southeast Texas with the remnants of Edouard. The storm, now a tropical depression, has dumped an estimated 15 to 22 inches of rain in spots, and some areas could experience rain totals of 25 to 30 inches.

As Tropical Storm Edouard crawled inland, heavy rain lashed southeastern Texas, with some areas receiving well over a foot. Forecasters warned that rains could persist into Thursday.

Dr. John Giusti's wife said the Texas chiropractor and his hiking group are among those missing after a flash flood tore through the Grand Canyon.

As Edouard downgrades to a tropical depression, parts of Southeast Texas brace for flash flooding, with warnings issued for Polk and Liberty counties.

The National Weather Service issued a life-threatening flash flood emergency for Hardin and Tyler counties in southeast Texas Wednesday morning. Between 10 and 21 inches of rain have fallen, and the expected rainfall rate was between 1 to 5 inches per hour. "Seek higher ground now!" a NWS graphic states.

Flash flooding can happen in mere minutes; here's how to stay safe

A flash flood warning was issued for San Antonio in Texas amid a storm in Bexar County, Texas as many feared about a tornado forming.