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 Southwest Arkansas. As a result, excessive heavy rainfall produced flash flooding in Columbia County, Arkansas.
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, 5:48 AM CST, 3 hours 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 648 AM CDT THU MAR 12 2015 .AVIATION... EXPECT WIDESPREAD IFR WEATHER TODAY INTO TONIGHT...MAINLY FROM CIGS...RAIN AND FOG. SCATTERED EMBEDDED TSTMS ARE ALSO EXPECTED...SOME WHICH MAY BE STRONG...CAUSING MODERATE TO SEVERE TURBULENCE. NO IMPROVEMENT EXPECTED THROUGH 13/12Z. && .PREV DISCUSSION... /ISSUED 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. &&
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
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
706 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0645 AM FLASH FLOOD 4 SE STONEWALL 32.23N 93.77W
03/12/2015 DE SOTO LA LAW ENFORCEMENT
DE SOTO PARISH SHERIFF OFFICE REPORTS FLASH FLOODING ON
RED BLUFF ROAD...JUST EAST OF JESSIE LATIN ROAD
INTERSECTION. ROAD IS IMPAASSABLE AND IS COVERED WITH
LOGS AND DEBRIS.
&&
EVENT NUMBER SHV1500249
20PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
754 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 AM FLASH FLOOD 8 NNW CONVERSE 31.89N 93.73W
03/12/2015 DE SOTO LA LAW ENFORCEMENT
DE SOTO PARISH SHERIFF REPORTS THAT THE INTERSECTION OF
W.P.A ROAD AND WALKER ROAD WAS COMPLETELY UNDER WATER.
&&
EVENT NUMBER SHV1500250
20PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
852 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0820 AM FLASH FLOOD SHREVEPORT 32.47N 93.80W
03/12/2015 CADDO LA BROADCAST MEDIA
WIDESPREAD REPORTS OF STREET FLOODING THROUGHOUT THE
CITY VIA SOCIAL MEDIA.
&&
EVENT NUMBER SHV1500252
20PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
930 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0820 AM FLASH FLOOD BOSSIER CITY 32.52N 93.66W
03/12/2015 BOSSIER LA BROADCAST MEDIA
WIDESPREAD REPORTS OF STREET FLOODING THROUGHTOUT THE
CITY VIA SOCIAL MEDIA.
&&
EVENT NUMBER SHV1500252
20PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
937 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0920 AM FLASH FLOOD SHREVEPORT 32.47N 93.80W
03/12/2015 CADDO LA BROADCAST MEDIA
BROADCAST MEDIA REPORTS 20 STALLED VEHICLES ON YOUREE
DRIVE FROM THE INTERSECTIONS OF SOUTHFIELD ROAD TO
STONER AVENUE.
&&
EVENT NUMBER SHV1500254
20PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
939 AM CDT THU MAR 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0920 AM FLASH FLOOD SHREVEPORT 32.47N 93.80W
03/12/2015 CADDO LA BROADCAST MEDIA
BROADCAST MEDIA REPORTS 20 STALLED VEHICLES ON YOUREE
DRIVE FROM THE INTERSECTIONS OF SOUTHFIELD ROAD TO
STONER AVENUE.
&&
EVENT NUMBER SHV1500255
20The Shreveport radar (KSHV), 109 km away, was scanning. The volume nearest the first event began at 15:01 UTC.
1 flash flood. Local standard time, as filed.
Sue Street was flooded and closed due to excessive heavy rainfall.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arkansas in 2015Every state in 2015This day in weather historyWarnings in Arkansas, 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: 555270.