A linear Mesoscale Convective System developed across southeast Texas during the last afternoon hours of April 27th and marched very slowly eastward across the southern portions of northeast Texas into west central Louisiana. especially across the lower Toledo Bend and Sam Rayburn Reservoirs of deep east Texas.
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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.
A linear Mesoscale Convective System developed across southeast Texas during the last afternoon hours of April 27th and marched very slowly eastward across the southern portions of northeast Texas into west central Louisiana. This system dumped very heavy rainfall amounts...especially across the lower Toledo Bend and Sam Rayburn Reservoirs of deep east Texas. Some flooding was reported in the eastern half of Angelina County, Texas.
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 Apr 27, 7:49 PM CST, 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 849 PM CDT MON APR 27 2009 .DISCUSSION... WILL GO AHEAD AND LET THE SEVERE THUNDERSTORM WATCH EXPIRE AT 9PM AS PLANNED WITH THE ONLY REALLY UNWORKED ATMOSPHERE BEING ACROSS NE LA BUT INSTABILITY IS STARTING TO WANE PER LATEST LAPS ANALYSIS. WILL KEEP POPS CONFIGURED AS WITH THE PREVIOUS UPDATE WITH CATEGORICAL POPS TO OUR SOUTH WITH CHANCE POPS FURTHER NORTH BUT WILL REMOVE SEVERE WORDING AND KEEP WITH THE HEAVY RAIN WORDING ACROSS OUR SOUTHERN ZONES. FLASH FLOOD WARNING ARE CURRENTLY IN EFFECT FOR ANGELINA...NACOGDOCHES AND SAN AUGUSTINE COUNTIES UNTIL MIDNIGHT. BECAUSE OF THE LACK OF COVERAGE TO THE HEAVY RAINFALL POTENTIAL TONIGHT...FEEL LIKE FLASH FLOOD WARNINGS WILL HANDLE THE PERCEIVED RAIN THREAT. MANY QUESTIONS STILL REMAIN WHEN IT COMES TO THE LIKELIHOOD OF REDEVELOPMENT FURTHER NORTH OF CURRENT ACTIVITY. LATEST RUC CONTINUES TO HINT AT THIS POSSIBILITY ALONG 850MB THETAE AXIS ACROSS NE TX/NW LA BUT THIS IS CONDITIONAL ON IF WE CAN SUSTAIN A DESCENT LOW LEVEL JET WHICH MAY BE DIFFICULT IN THE WAKE OF LINEAR MCS TO OUR SOUTH. THUS WE WILL KEEP CHANCE POPS GOING ACROSS THE NORTH TONIGHT. NO OTHER CHANGES NECESSARY TONIGHT. 13 && .AVIATION... SCATTERED CONVECTION ACROSS MUCH OF THE AREA HAS BECOME ISOLATED...WITH EXCEPTION OF MCS WHICH HAS MOVED NE INTO AREA. LFK AREA STILL COVERED IN SHOWERS...WITH VERY HEAVY RECENT RAINFALLS. THIS MCS WILL AT LEAST CLIP SHV SITE...ALSO WITH SOME RECENT HEAVY RAINFALL. THESE TWO SITES COULD SEE SOME PATCHY FOG OVERNIGHT...DESPITE LIGHT BREEZE AND VARIABLE CLOUDS. A SMALL CLUSTER OF TSTMS WILL AFFECT MLU AREA UNTIL 03Z...WITH ELD AND MLU POSSIBLY AFFECTED BY MCS AFTER 05Z...IF MCS HOLDS TOGETHER. TXK...GGG...TYR APPEAR TO REMAIN IN VFR CONDITIONS FOR MUCH OF THE NIGHT...ASSUMING MCS DISRUPTING RETURN OF LOW CIGS IN SOUTHERLY FLOW. COLD FRONT...SOUTH OF A OKC TO TSA LINE...CURRENTLY WITH HIGH IFR/LOW MVFR CIG IN WAKE...LIKELY TO STALL JUST BEFORE REACHING ANY TAF SITES. CURRENTLY LITTLE CONVECTION ALONG THIS BOUNDARY...SUCH IS NOT EXPECTED TO REMAIN THE CASE HOWEVER...BY 12Z TUE. EXPECT CIGS AND POSSIBLY VIS TO DETERIORATE AFT 12Z IN CONVECTION. /VII/ && .PRELIMINARY POINT TEMPS/POPS... SHV 65 80 64 83 65 / 70 80 40 30 30 MLU 65 80 63 83 63 / 50 60 40 20 30 DEQ 62 75 62 80 61 / 50 80 50 50 30 TXK 65 75 64 80 65 / 50 90 50 40 30 ELD 65 78 63 81 63 / 50 80 50 30 30 TYR 66 79 66 83 66 / 70 80 30 30 30 GGG 65 80 65 83 65 / 70 80 40 30 30 LFK 65 83 66 85 67 / 90 60 40 20 30 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. && 13/07
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1148 AM CDT MON APR 27 2009 ARZ050-051-059>061-070>072-LAZ001>004-010>012-OKZ077-TXZ096-097- 108>112-124>126-136>138-149>153-281700- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-CADDO-BOSSIER-WEBSTER-CLAIBORNE-DE SOTO-RED RIVER- BIENVILLE-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD- UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA- NACOGDOCHES-SHELBY- 1148 AM CDT MON APR 27 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST ARKANSAS...NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... A COLD FRONT WILL BE MOVING INTO NORTH CENTRAL TEXAS... SOUTHEAST OKLAHOMA...AND WESTERN ARKANSAS THIS EVENING. STRONG TO SEVERE THUNDERSTORMS WILL DEVELOP AND SPREAD NORTHEAST AHEAD OF THE SYSTEM AS UPPER DISTURBANCES MOVE OVERHEAD IN A MOIST AND UNSTABLE ATMOSPHERE. STORMS ARE EXPECTED TO PRODUCE LARGE HAIL...HIGH AND DAMAGING WINDS...LOCALLY HEAVY RAINFALL AND ISOLATED TORNADOES. RAINFALL AMOUNTS THROUGH TONIGHT WILL RANGE FROM ONE TO TWO INCHES WITH ISOLATED AMOUNTS TO FOUR INCHES POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... A COLD FRONT WILL BECOME NEARLY STATIONARY ACROSS NORTHEAST TEXAS INTO SOUTHWEST ARKANSAS ON TUESDAY...THEN LIFT BACK NORTH INTO WEDNESDAY. STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO DEVELOP AND SPREAD EAST AND NORTHEAST ACROSS THE AREA THROUGH THE WEEKEND. STORMS ARE EXPECTED TO PRODUCE LARGE HAIL...HIGH AND DAMAGING WINDS...LOCALLY HEAVY RAINFALL AND ISOLATED TORNADOES. RAINFALL MAY BE HEAVY AT TIMES...WITH FLASH FLOODING POSSIBLE. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGERS EXPECTED THROUGH THE AFTERNOON AND OVERNIGHT. ARZ073-LAZ005-006-013-014-017>022-TXZ165>167-281700- UNION AR-LINCOLN-UNION LA-JACKSON-OUACHITA-SABINE LA-NATCHITOCHES- WINN-GRANT-CALDWELL-LA SALLE-ANGELINA-SAN AUGUSTINE-SABINE TX- 1148 AM CDT MON APR 27 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...NORTH CENTRAL LOUISIANA...NORTHWEST LOUISIANA AND EAST TEXAS. .DAY ONE...TODAY AND TONIGHT... A COLD FRONT WILL BE MOVING INTO NORTH CENTRAL TEXAS... SOUTHEAST OKLAHOMA...AND WESTERN ARKANSAS THIS EVENING. STRONG TO SEVERE THUNDERSTORMS WILL DEVELOP AND SPREAD NORTHEAST AHEAD OF THE SYSTEM AS UPPER DISTURBANCES MOVE OVERHEAD IN A MOIST AND UNSTABLE ATMOSPHERE. STORMS ARE EXPECTED TO PRODUCE LARGE HAIL...HIGH AND DAMAGING WINDS... LOCALLY HEAVY RAINFALL AND ISOLATED TORNADOES. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... A COLD FRONT WILL BECOME NEARLY STATIONARY ACROSS NORTHEAST TEXAS INTO SOUTHWEST ARKANSAS ON TUESDAY...THEN LIFT BACK NORTH INTO WEDNESDAY. STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO DEVELOP AND SPREAD EAST AND NORTHEAST ACROSS THE AREA THROUGH THE WEEKEND. STORMS ARE EXPECTED TO PRODUCE LARGE HAIL...HIGH AND DAMAGING WINDS...LOCALLY HEAVY RAINFALL AND ISOLATED TORNADOES. RAINFALL MAY BE HEAVY AT TIMES...WITH FLASH FLOODING POSSIBLE. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGERS MAY BE NEEDED TONIGHT.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Angelina County sheriffs office reported that most roads in the town were underwater.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2009Every state in 2009This day in weather historyWarnings in Texas, April 2009
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: 161431.