The same upper level trough that was responsible for excessive heavy rainfall across Northeast Texas on March 9th remained nearly stationary across West Texas on March 12th.  An area of low pressure at the surface developed off the Southeast Texas and Southwest Louisiana Coasts.  Moisture continued to return rapidly into the region from the south and southwest in response to the upper level trough and the surface low pressure area.  A narrow line of convection developed during the predawn hours of March 12th and moved rapidly northward into Northwest Louisiana.  As a result, excessive heavy rainfall produced flash flooding across the region.

Flash Flood in CADDO, LOUISIANA
From 12-MAR-15 15:00:00 to 12-MAR-15 17:30:00 (CST-6)
Location: SHREVEPORT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A drainage ditch completely caved in from flood waters prompting voluntary evacuations from the Normandy Village in South Highland neighborhood.

Flash Flood in CADDO, LOUISIANA
From 12-MAR-15 14:35:00 to 12-MAR-15 17:30:00 (CST-6)
Location: SPRING RIDGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Excessive heavy rainfall resulted in high water being reported on Colquitt Road near Southside Riding Club.

Flash Flood in BOSSIER, LOUISIANA
From 12-MAR-15 07:20:00 to 12-MAR-15 11:45:00 (CST-6)
Location: BOSSIER CITY
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Widespread heavy rainfall resulted in the closure of several city streets in Bossier City, Louisiana.  Some cars were stalled in high water as they attempted to navigate through flooded roadways.

Flash Flood in DE SOTO, LOUISIANA
From 12-MAR-15 15:11:00 to 12-MAR-15 17:30:00 (CST-6)
Location: MANSFIELD ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several secondary roads were flooded and closed throughout De Soto Parish from excessive heavy rainfall.

Flash Flood in BOSSIER, LOUISIANA
From 12-MAR-15 15:15:00 to 12-MAR-15 17:30:00 (CST-6)
Location: MC DADE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A portion of Hwy. 154 caved in over a large culvert between Bossier Point Road and Robinson Road near Elm Grove, Louisiana.

Flash Flood in DE SOTO, LOUISIANA
From 12-MAR-15 05:50:00 to 12-MAR-15 07:15:00 (CST-6)
Location: LOLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The intersection of W.P.A Road and Walker Road was completely under water and closed northwest of Converse, Louisiana.

Flash Flood in DE SOTO, LOUISIANA
From 12-MAR-15 05:45:00 to 12-MAR-15 07:15:00 (CST-6)
Location: REEDS STORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Excessive heavy rainfall resulted in the closure of Red Bluff Road just east of Jessie Latin Road southeast of Stonewall, Louisiana.

Flash Flood in CADDO, LOUISIANA
From 12-MAR-15 07:20:00 to 12-MAR-15 11:45:00 (CST-6)
Location: SHREVEPORT
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Several city streets were flooded and closed due to excessive heavy rainfall, especially across the southern and southeast sides of the city.  Several cars were flooded out from owners who attempted to cross flooded roadways.