A slow moving upper and surface trough, an abundance of Gulf of Mexico moisture, and remnants of moisture from a dying Pacific tropical cyclone resulted in devastating flash flooding in part of West Central Texas.  The town of Sonora along the Dry Devil's Draw was hardest hit by a wall of water and subsequent flash flooding.

Flash Flood in CROCKETT, TEXAS
From 21-SEP-18 07:42:00 to 21-SEP-18 10:00:00 (CST-6)
Location: OZONA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A photo from the Ozona Stockman Newspaper Facebook Page showed a flooded low water crossing with deep water in Ozona.

Flash Flood in NOLAN, TEXAS
From 21-SEP-18 09:48:00 to 21-SEP-18 10:30:00 (CST-6)
Location: MARYNEAL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Texas Division of Emergency Management reported closure of FM 1170 south of Maryneal due to flooding.

Flash Flood in SCHLEICHER, TEXAS
From 21-SEP-18 10:35:00 to 21-SEP-18 13:00:00 (CST-6)
Location: EL DORADO MUNI ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous road were closed throughout central Schleicher County due to flash flooding.

Flash Flood in SCHLEICHER, TEXAS
From 21-SEP-18 11:56:00 to 21-SEP-18 13:00:00 (CST-6)
Location: EL DORADO MUNI ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A vehicle was stranded in high water off of County Road 316 with one individual forced onto a rooftop.  A water rescue was underway with a helicopter enroute.

Flash Flood in SUTTON, TEXAS
From 21-SEP-18 12:43:00 to 21-SEP-18 15:00:00 (CST-6)
Location: SONORA ALLISON ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law Enforcement reported flooding across Interstate 10 at Mile Marker 392.  Interstate 10 was closed west of Sonora.  US Highway 277 north of Sonora was also closed due to flooding.

Flash Flood in SUTTON, TEXAS
From 21-SEP-18 12:00:00 to 21-SEP-18 15:15:00 (CST-6)
Location: SONORA
Flood cause: Heavy Rain
Property damage: 8.00M
Crop damage: 0.00K
Reported by: Public

Very heavy rain of eight plus inches fell north of Sonora in the vicinity of thirteen uncontrolled dams north of Sonora. Sites 1-8 are on the Dry Devils River and Sites 9-13 are on Lowrey Draw.  As these dams filled, flood waters overflowed the spillways into the draws.  This was the first time (as far as anyone knows) the emergency spillways were activated for some of these dams.  There were no breaches, these structures worked as they were meant to function.  Normally these structures would help mitigate flooding in Sonora, but previous rains had already filled up many of the sites.
One of the deputies saw a wall of water come down the Dry Devil's Draw just north of Sonora at about 1 PM CDT near U.S. 277.  This wall of water flooded many homes located near the Dry Devil's Draw in Sonora shortly after 1 PM CDT.  Flood waters even  flowed over the US 277 bridge on the south side of Sonora.  The depth of this wall of water is estimated at around 25 feet.  The flood waters cut off the city of Sonora from neighboring first responders in all directions who wanted to help.  Emergency management reported about 250 homes were either damaged or destroyed.

Flash Flood in JONES, TEXAS
From 21-SEP-18 16:14:00 to 21-SEP-18 23:59:00 (CST-6)
Location: RADIUM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Texas Division of Emergency Management reported closure of US Highway 83 between Anson and Hamlin because of water over the road.

Flood in TOM GREEN, TEXAS
From 21-SEP-18 14:16:00 to 21-SEP-18 23:59:00 (CST-6)
Location: TANKERSLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A low water crossing between Dove Creek Lane West and Dove Creek Lane East was closed because of flooding.

Flood in JONES, TEXAS
From 21-SEP-18 14:21:00 to 21-SEP-18 23:59:00 (CST-6)
Location: TUXEDO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Facebook Post from the public showed Highway 92 in Tuxedo flooded.

Flash Flood in HASKELL, TEXAS
From 21-SEP-18 12:36:00 to 21-SEP-18 23:59:00 (CST-6)
Location: WEINERT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Texas Division of Emergency Management reported the following roads closed due to flooding in Haskell County:  FM 2407 between US 380 and CR 110; FM 2163 between
CR 110 and FM 617; and FM 617 between Weinert and FM 2163.

Flood in IRION, TEXAS
From 21-SEP-18 16:32:00 to 21-SEP-18 23:59:00 (CST-6)
Location: SHERWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Texas Department of Transportation reported RM 853 east of Mertzon closed at RM 564 due to high water over the draw.