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.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SHV wrote it up.
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.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Shreveport, LA wrote its last area forecast discussion before the first event at Mar 12, 4:40 AM CST, 1 hour 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 540 AM CDT THU MAR 12 2015 .DISCUSSION... WATER VAPOR LOOP REVEALS STRONG MOISTURE POOL OVER SE TX MOVING NORTH INTO OUR REGION WITH MORE INTENSE CONVECTION INDICATED FARTHER EAST OVER THE N CNTRL GULF TO ALONG THE SE LA/MS COAST. MEANWHILE AT A SFC...LOW REMAINS NEARLY STATIONARY OFF THE LA/TX COAST JUST SOUTH OF SABINE PASS WITH WIDESPREAD SHWRS NOW WELL INTO OUR REGION THIS MORNING IN ADDITION TO A FEW EMBEDDED TSTMS NEAR TOLEDO BEND COUNTRY. EXPECT THE EXPANSION OF SHWRS AND ISOLD TSTMS TO CONTINUE THROUGHOUT TODAY AS THE UPPER TROF LIFTS FARTHER NORTH FROM THE COAST...AND AS THE SFC LOW BEGINS TO MOVE INLAND WITH AN ADVANCING WARM FRONT. THE AXIS OF HEAVY RAINFALL STILL LOOKS TO BE SETTING UP FROM DEEP E TX INTO TO NW LA THIS MORNING AND GRADUALLY FILLING IN ACROSS THE REMAINDER OF N LA AND S AR LATER TODAY THROUGH TONIGHT...PRODUCING 1-3 INCHES OF RAINFALL ALONG AND EAST OF THIS HEAVIER AXIS WITH LESSER AMOUNTS BACK TO THE NORTHWEST FROM SE OK DOWN ACROSS THE UPPER PART OF NE TX. AS FOR THE AREAS WHERE HIGHER AMOUNTS ARE EXPECTED...DECIDED TO FOREGO A FLASH FLOOD WATCH AS 3/6 HOUR GUIDANCE SUGGESTS AMOUNTS LIKELY WILL NOT NECESSITATE A WATCH AT THIS TIME. HOWEVER...SOILS ARE STILL NEAR SATURATION IN SOME AREAS DESPITE THE LAST FEW DRY DAYS SO TYPICAL FLOOD PRONE AREAS WILL BE A CONCERN ONCE AGAIN. RAIN WILL CONTINUE THROUGH MUCH OF FRIDAY BUT WILL BEGIN TO LESSEN IN COVERAGE AND INTENSITY AS THE UPPER TROF AND SFC LOW SHIFT NE INTO THE MID MS VALLEY. IN THE MEANTIME...WE WILL SEE A WEAK COLD FRONT ON THE HEELS OF THE DEPARTING TROF ON SATURDAY WHICH MAY BE ENOUGH TO INITIATE ISOLD TO SCT SHWRS ACROSS THE NRN TWO THIRDS OF THE REGION BUT DO NOT ANTICIPATE MUCH QPF. CLOUDS WILL CONTINUE TO LINGER THROUGH THE REMAINDER OF THE WEEKEND ALTHOUGH A DRIER AND WARMER PATTERN WILL PREVAIL INTO EARLY NEXT WEEK AS UPPER RIDGING WILL TAKE HOLD ACROSS THE REGION. THE NEXT CHANCE FOR RAIN WILL COME LATE TUESDAY INTO WEDNESDAY WITH ANOTHER COLD FRONT ADVANCING SOUTH AND PUSHING OUR TEMPERATURES BACK NEAR OR JUST SLIGHTLY BELOW SEASONAL AVERAGES. /19/ && .PRELIMINARY POINT TEMPS/POPS... SHV 64 60 67 53 / 100 70 40 20 MLU 70 62 71 53 / 100 80 60 20 DEQ 60 55 66 53 / 90 70 40 30 TXK 60 56 66 53 / 90 70 60 20 ELD 63 60 69 54 / 100 80 60 30 TYR 60 54 66 51 / 90 40 30 10 GGG 62 57 67 51 / 90 50 30 10 LFK 65 56 68 52 / 90 50 30 10 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. && 19
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 625 AM CDT THU MAR 12 2015 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-TXZ097-112- 126-138-149>153-165>167-122330- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-DE SOTO- RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE-NATCHITOCHES-WINN- GRANT-CALDWELL-LA SALLE-BOWIE-CASS-MARION-HARRISON-CHEROKEE-RUSK- PANOLA-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE- 625 AM CDT THU MAR 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...TEXAS AND NORTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT... WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAINFALL AMOUNTS OF ONE TO THREE INCHES THROUGH TONIGHT AS A SURFACE LOW AND WARM FRONT ADVANCE NORTH FROM THE GULF ACROSS OUR REGION IN CONCERT WITH AN UPPER LEVEL TROUGH SHIFTING NORTH AS WELL. RAINFALL MAY PRODUCE SOME MINOR FLOODING OF LOW LYING AND POOR DRAINAGE AREAS WHERE PREVIOUS RAINS HAVE ALREADY SATURATED SOILS. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... RAIN WILL LINGER THROUGH FRIDAY BEFORE GRADUALLY TAPERING OFF ON SATURDAY IN THE WAKE OF A WEAK COLD FRONT PASSING THROUGH THE REGION. THE NEXT CHANCE FOR ANY SHOWERS AND THUNDERSTORMS WILL COME ON LATE TUESDAY INTO WEDNESDAY NEXT WEEK. HOWEVER...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO OPERATORS...AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH TONIGHT. OKZ077-TXZ096-108>111-124-125-136-137-122330- MCCURTAIN-RED RIVER-FRANKLIN-TITUS-CAMP-MORRIS-WOOD-UPSHUR-SMITH- GREGG- 625 AM CDT THU MAR 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT... WIDESPREAD SHOWERS WILL PRODUCE RAINFALL AMOUNTS OF NEAR ONE INCH OR LESS THROUGH TONIGHT AS A SURFACE LOW AND WARM FRONT ADVANCE NORTH FROM THE GULF ACROSS OUR REGION IN CONCERT WITH AN UPPER LEVEL TROUGH SHIFTING NORTH AS WELL. HOWEVER...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... RAIN WILL LINGER THROUGH FRIDAY BEFORE GRADUALLY TAPERING OFF ON SATURDAY IN THE WAKE OF A WEAK COLD FRONT PASSING THROUGH THE REGION. THE NEXT CHANCE FOR ANY SHOWERS AND THUNDERSTORMS WILL COME ON LATE TUESDAY INTO WEDNESDAY NEXT WEEK. HOWEVER...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO OPERATORS...AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH TONIGHT. 19
The Shreveport radar (KSHV), 26 km away, was scanning. The volume nearest the first event began at 11:46 UTC.
8 flash flood. Local standard time, as filed.
Excessive heavy rainfall resulted in the closure of Red Bluff Road just east of Jessie Latin Road southeast of Stonewall, Louisiana.
The intersection of W.P.A Road and Walker Road was completely under water and closed northwest of Converse, Louisiana.
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.
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.
Excessive heavy rainfall resulted in high water being reported on Colquitt Road near Southside Riding Club.
A drainage ditch completely caved in from flood waters prompting voluntary evacuations from the Normandy Village in South Highland neighborhood.
Several secondary roads were flooded and closed throughout De Soto Parish from excessive heavy rainfall.
A portion of Hwy. 154 caved in over a large culvert between Bossier Point Road and Robinson Road near Elm Grove, Louisiana.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2015Every state in 2015This day in weather historyWarnings in Louisiana, March 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 555266, 555267, 555268, 555269, 555271, 555272, 555273, 555274.