A tropical laden airmass combined with strong heating across northeast Texas resulted in strong thunderstorms across portions of the region. These thunderstorms were heavy rain producers with isolated flash flooding reported noted with the stronger storm cores.
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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 tropical laden airmass combined with strong heating across northeast Texas resulted in strong thunderstorms across portions of the region. These thunderstorms were heavy rain producers with isolated flash flooding reported noted with the stronger storm cores.
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 Aug 18, 2:28 PM CST, 2 hours 47 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 328 PM CDT TUE AUG 18 2009 .DISCUSSION... DEEP SOUTHERLY FLOW AROUND BACKSIDE OF RIDGING OVER SE STATES...BROUGHT SURGE OF MOISTURE FROM COAST. WITH PWS ABOVE TWO INCHES ACROSS AREA...HIGH END SCATTERED TSTM DEVELOPED EARLY IN HEATING CYCLE. AS THIS RIDGING PATTERN CHANGES LITTLE ON WED... GOING WITH HIGHER MET GUIDANCE...WHICH VERIFIED FOR TODAY. WENT WITH SCT POPS...EXCEPT FOR LIKELY EAST....ALSO WITH MENTION OF HEAVY RAINFALL. WILL KEEP LOW OVERNIGHT POPS AS WELL. COLD FRONT WILL MOVE QUICKLY SOUTH FROM NORTHERN PLAINS DUE TO UNSEASONALLY STRONG NORTHERLY FLOW ALOFT ACROSS THAT AREA. ONCE FRONT REACHES SE OK BY 0Z FRI...UPPER FLOW WILL BE AFFECTED MORE BY RETREATING RIDGE OVER SE STATES...THAN BY UPPER LOW OVER GREAT LAKES...THUS WILL GO WITH ETA SOLUTION WHICH BRINGS SLOWER MOVEMENT OF FRONT ACROSS AREA ON FRI. TOO SOON IN FCST TO MENTION EITHER SVR OR HEAVY RAIN THU NIGHT AND FRI...BUT ADDING FRONT TO VERY JUICY AIRMASS... AND COLDER TEMPS ALOFT MAY SLIDE SOUTH OVER FRONTAL BOUNDARY GIVEN UPPER FLOW OVER PLAINS...MAY BRING SVR POTENTIAL. IF FRONT STALLS... HEAVY RAIN COULD BE THREAT. ALSO...WENT LOWER THAN GUIDANCE ON HIGH TEMPS WED. NATURE OF CONVECTION TODAY YIELDED WIDE VARIABILITY IN TEMPS...BUT MOST TEMPS REMAINED IN 80S...AND EXPECT MOSTLY CLOUDY ONCE AGAIN./VII/ && .AVIATION... SCATTERED TO NUMEROUS SHRA/TSRA CONTINUES OVER THE FORECAST AREA THIS AFTERNOON...AS A MULTITUDE OF MESOSCALE BOUNDARIES COMBINE WITH ABUNDANT MOISTURE AND DAYTIME HEATING. EXPECT CONVECTION TO WIND DOWN AROUND 19/0100 UTC...WITH PATCHY BR/LOW CIGS IN RA AREAS ANTICIPATED AFTER 19/0600 UTC. FLIGHT CATEGORIES SHOULD MOSTLY BE VFR...EXCEPT IN CONVECTIVE REGIONS AND OVERNIGHT. NO SIGNIFICANT CHANGE IN AIRMASS IS ANTICIPATED...SO ADDITIONAL SHRA/TSRA DEVELOPMENT WILL BE POSSIBLE WEDNESDAY. /D. BUTTS/ && .PRELIMINARY POINT TEMPS/POPS... SHV 75 88 75 93 74 / 40 50 30 20 50 MLU 74 88 75 93 74 / 40 60 40 30 30 DEQ 73 91 73 90 70 / 40 30 20 30 50 TXK 74 88 75 92 71 / 40 40 30 20 50 ELD 74 87 74 92 72 / 40 50 30 30 50 TYR 76 92 76 93 73 / 30 30 20 20 50 GGG 75 89 76 93 74 / 30 30 20 20 50 LFK 74 90 76 96 75 / 40 50 30 30 30 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1141 AM CDT TUE AUG 18 2009 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-191645- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN- UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA- NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE- FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG- HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA- SAN AUGUSTINE-SABINE TX- 1141 AM CDT TUE AUG 18 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT...SCATTERED SHOWERS AND THUNDERSTORMS HAVE QUICKLY DEVELOPED ACROSS MUCH OF THE FOUR STATE AREA...ESPECIALLY NORTHERN LOUISIANA NAD THE EAST TEXAS LAKES. ALTHOUGH SOME VERY LOCALISED HEAVY RAIN IS POSSIBLE...MOST STORMS ARE EXPECTED TO REMAIN WELL BELOW SEVERE LIMITS. NO HAZARDOUS WEATHER EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY... SHOWERS AND THUNDERSTORMS WILL BE SCATTERED ACROSS THE FOUR STATE REGION THROUGH LATE WEEK UNTIL A COLD FRONT MOVES SOUTH OF THE REGION BRINGING AN END TO THE RAINFALL. SOME OF THE THUNDERSTORMS WILL BECOME SEVERE ALONG AND NEAR THE FRONTAL BOUNDARY NEAR THE INTERSTATE 30 CORRIDOR THURSDAY NIGHT AND EARLY FRIDAY...THEN ALONG AND SOUTH OF THE INTERSTATE 20 CORRIDOR DURING THE MORNING AND EARLY AFTERNOON FRIDAY. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT PERSONNEL ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS... AND EMERGENCY MANAGEMENT PERSONNEL IS NOT ANTICIPATED THIS AFTERNOON OR TONIGHT. VII
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
346 PM CDT TUE AUG 18 2009
TXZ096-182145-
RED RIVER-
346 PM CDT TUE AUG 18 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 445 PM CDT...FOR THE FOLLOWING
COUNTY...
IN NORTHEAST TEXAS...
RED RIVER...
INCLUDING THE FOLLOWING LOCATIONS...
BAGWELL...BOGATA...BOXELDER...CLARKSVILLE AND MANCHESTER...
AT 344 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES EAST OF
MANCHESTER TO 6 MILES NORTHEAST OF DEPORT...MOVING SOUTHEAST AT 20
MPH.
HAIL SMALLER THAN THREE QUARTERS OF AN INCH AND WIND GUSTS AROUND 40
MPH ARE EXPECTED WITH THESE STORMS.
PEOPLE IN RED RIVER COUNTY SHOULD CLOSELY MONITOR THIS LINE OF
STORMS.
STAY TUNED FOR FURTHER UPDATES FROM YOUR NATIONAL WEATHER SERVICE IN
SHREVEPORT.
D. BUTTSSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
443 PM CDT TUE AUG 18 2009
ARZ050-OKZ077-TXZ096-097-182245-
BOWIE-MCCURTAIN-RED RIVER-SEVIER-
443 PM CDT TUE AUG 18 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 545 PM CDT...FOR THE FOLLOWING
COUNTIES...
IN SOUTHWEST ARKANSAS...
SEVIER...
IN SOUTHEAST OKLAHOMA...
MCCURTAIN...
IN NORTHEAST TEXAS...
RED RIVER AND BOWIE...
INCLUDING THE FOLLOWING LOCATIONS...
GILLHAM...BOGATA...BOXELDER...CLARKSVILLE...DALBY SPRINGS...DE
KALB...HOOKS...MAUD...NASH...NEW
BOSTON...REDWATER...SIMMS...TEXARKANA AND WAKE VILLAGE...
AT 445 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 15 MILES WEST OF DE
QUEEN TO HAGANSPORT...MOVING SLOWLY TO THE EAST AT 5 TO 10 MPH.
WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE STORMS. VERY HEAVY
RAINFALL OF ONE TO TWO INCHES MAY ALSO OCCUR IN A SHORT PERIOD OF
TIME.
VIISPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
554 PM CDT TUE AUG 18 2009
TXZ096-108-109-182345-
FRANKLIN-RED RIVER-TITUS-
554 PM CDT TUE AUG 18 2009
...SIGNIFICANT WEATHER ALERT...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 645 PM CDT...FOR THE FOLLOWING
COUNTIES...
IN NORTHEAST TEXAS...
RED RIVER...TITUS AND FRANKLIN...
INCLUDING THE FOLLOWING LOCATIONS...
BOXELDER...COOKVILLE...HAGANSPORT...MOUNT PLEASANT...MOUNT
VERNON...PURLEY AND WILKERSON...
AT 552 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A CLUSTER OF INTENSIFYING THUNDERSTORMS ACROSS THE AREA...MOVING EAST AT
10 TO 15 MPH.
WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.
VIIThe Shreveport radar (KSHV), 83 km away, was scanning. The volume nearest the first event began at 23:16 UTC.
1 flash flood. Local standard time, as filed.
Three inches of rainfall fell in 20 minutes and a total of 4.70 inches fell in 65 minutes near the town of Avinger, Texas. Several roads and secondary roads were underwater southwest of town.
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, August 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: 188629.