Scattered thunderstorms developed during the afternoon across southwest Louisiana. Some of these thunderstorms began repeatedly training across Jefferson Davis Parish, causing flooding in the town of Roanoke.
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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 LCH wrote it up.
Scattered thunderstorms developed during the afternoon across southwest Louisiana. Some of these thunderstorms began repeatedly training across Jefferson Davis Parish, causing flooding in the town of Roanoke.
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 Lake Charles, LA wrote its last area forecast discussion before the first event at Aug 9, 2:40 PM CST, 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAKE CHARLES LA 340 PM CDT SUN AUG 9 2009 .DISCUSSION...REGIONAL 88DS SHOW SCATTERED SHOWERS AND THUNDERSTORMS CONTINUE TO DEVELOP AND PUSH NWD ACROSS THE FORECAST AREA...BUT PRIMARILY FROM I-10 NWD. THIS ACTIVITY SHOULD LINGER THROUGH MID-EVENING BEFORE DISSIPATING WITH LOSS OF DAYTIME HEATING. TYPICAL NOCTURNAL DEVELOPMENT OVER THE COASTAL WATERS SHOULD COMMENCE AFTER MIDNIGHT THEN MOVE NWD TOWARD THE COASTAL ZONES. A FEW OF THESE SHOWERS/POSSIBLE STORMS WILL MAKE IT ASHORE AND THUS A SMALL POP IS BEING RETAINED FROM I-10 TO THE COAST TO ACCOUNT FOR THIS ACTIVITY. FORECAST SOUNDINGS INDICATE A LINGERING MOIST AND UNSTABLE AIRMASS FOR MONDAY. EXPECTING ANOTHER ROUND OF SCATTERED SHOWERS/STORMS CONTINUING NEAR THE COAST DURING THE MORNING THEN ADVANCING NWD DURING THE DAY. BUT WITH THE WEAKENING UPPER-LEVEL RIDGE PROGGED TO RETROGRADE WWD DURING THE DAY FORECAST SOUNDINGS SHOW PERHAPS A LITTLE CAPPING SO SLIGHTLY LOWER POPS HAVE BEEN INCLUDED. MONDAY NIGHT LOOKS LIKE A REPLAY OF TONIGHT. DEEP MOISTURE WILL REMAIN IN PLACE OVER THE AREA THROUGH MID-WEEK. NO GREAT FOCUS IS FORECAST TO AFFECT THE REGION BUT WITH MINIMAL CAPPING PROGGED AND DAYTIME HEATING WITH EASILY ATTAINABLE TRIGGER TEMPS...WE SHOULD STILL SEE SCATTERED CONVECTION TUESDAY AND WEDNESDAY. TROF DIGGING DOWN THE ERN CONUS WILL PUSH THE RIDGE BACK TOWARD THE DESERT SW AND NRLY FLOW BETWEEN THE FEATURES WILL USHER IN SLIGHTLY DRIER AIR FOR THURSDAY ALTHOUGH ENOUGH LOWER MOISTURE IS PROGGED TO AT LEAST INCLUDE A 20 POP FOR THEN. SOME DIFFERENCES IN MODEL SOLUTIONS EXIST FOR LATE IN THE PERIOD SO HAVE RETURNED POPS TO MORE SEASONAL VALUES WITH SCATTERED CONVECTION EXPECTED. THANKS TO THE SLIGHTLY WARMING TEMPS ALOFT AFTERNOON MAXES WILL BEGIN TO CREEP UPWARD...REACHING THE MID/UPPER 90S BY MID-WEEK. HEAT INDEX VALUES ARE COMPUTED TO REACH THE 105 NEIGHBORHOOD THUS STAYING JUST BELOW THE LOCAL 108 CRITERIA. && .MARINE...MAINLY LIGHT SRLY FLOW EXPECTED TO CONTINUE THROUGH THE PERIOD WITH HIGH PRESSURE REMAINING IN CONTROL. MAIN EXCEPTIONS WILL BE THE SEASONAL LATE NIGHT JETTING WHICH WILL PUSH SPEEDS TO THE 10-15 KNOT RANGE OVER THE WRN WATERS. && .PRELIMINARY POINT TEMPS/POPS... KLCH 76 93 76 94 78 / 20 40 20 30 20 KBPT 76 94 77 94 78 / 20 40 20 30 20 KAEX 74 95 74 97 74 / 20 40 20 40 20 KLFT 76 93 76 95 76 / 20 50 20 40 20 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...NONE. TX...NONE. GM...NONE. && 25
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAKE CHARLES LA 523 AM CDT SUN AUG 9 2009 GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-051>055- TXZ180>182-201-215-216-101000- SABINE LAKE-CALCASIEU LAKE-VERMILION BAY- COASTAL WATERS FROM CAMERON, LA TO HIGH ISLAND, TX OUT 20 NM- COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON, LA OUT 20 NM- COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA OUT 20 NM- WATERS FROM CAMERON, LA TO HIGH ISLAND, TX EXTENDING FROM 20 NM TO 60 NM- WATERS FROM INTRACOASTAL CITY, LA TO CAMERON, LA EXTENDING FROM 20 NM TO 60 NM- WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA EXTENDING FROM 20 NM TO 60 NM-VERNON-RAPIDES-AVOYELLES-BEAUREGARD- ALLEN-EVANGELINE-ST. LANDRY-CALCASIEU-JEFFERSON DAVIS-ACADIA- LAFAYETTE-UPPER ST. MARTIN-CAMERON-VERMILION-IBERIA-ST. MARY- LOWER ST. MARTIN-TYLER-JASPER-NEWTON-HARDIN-JEFFERSON-ORANGE- 523 AM CDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST GULF OF MEXICO...CENTRAL LOUISIANA...SOUTH CENTRAL LOUISIANA... SOUTHWEST LOUISIANA...WEST CENTRAL LOUISIANA AND SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT HIGH PRESSURE OVER THE CAROLINAS WILL KEEP TROPICAL AIR OVER THE REGION WITH SCATTERED LATE MORNING AND AFTERNOON SHOWERS AND THUNDERSTORMS. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED SHOWERS AND THUNDERSTORMS WILL DECREASE AFTER MONDAY AS HIGH PRESSURE BUILDS IN FROM THE WEST. RAIN CHANCES INCREASE AGAIN LATER IN THE WEEK AS A FRONTAL BOUNDARY STALLS ACROSS EAST TEXAS AND CENTRAL LOUISIANA. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. SWEENEY
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LAKE CHARLES LA 244 PM CDT SUN AUG 9 2009 LAZ028-029-092045- RAPIDES LA-AVOYELLES LA- 244 PM CDT SUN AUG 9 2009 ...SIGNIFICANT WEATHER ALERT FOR EASTERN RAPIDES AND WESTERN AVOYELLES PARISHES UNTIL 345 PM CDT... AT 243 PM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL WEATHER SERVICE DOPPLER RADAR 3 MILES NORTHWEST OF CHENEYVILLE... MOVING NORTH AT 15 MPH. * THE STRONG THUNDERSTORM WILL BE NEAR... LECOMPTE BY 255 PM CDT... ECHO BY 310 PM CDT... CENTERPOINT AND EFFIE BY 345 PM CDT... FREQUENT CLOUD TO GROUND LIGHTNING...PEA SIZE HAIL...AND WIND GUSTS TO 50 MPH ARE LIKELY WITH THIS STORM. HEAVY RAINFALL WILL CAUSE PONDING OF WATER ON AREA ROADWAYS...ESPECIALLY THOSE IN POOR DRAINAGE AREAS. RESIDENTS ARE ENCOURAGED TO MONITOR THE SITUATION CLOSELY AND BE PREPARED TO TAKE THE PROPER ACTIONS SHOULD A WARNING BE ISSUED. SHAMBURGER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LAKE CHARLES LA 318 PM CDT SUN AUG 9 2009 LAZ031-092100- ALLEN LA- 318 PM CDT SUN AUG 9 2009 ...SIGNIFICANT WEATHER ALERT FOR SOUTHWESTERN ALLEN PARISH UNTIL 400 PM CDT... AT 315 PM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL WEATHER SERVICE DOPPLER RADAR OVER REEVES...MOVING NORTH AT 10 MPH. FREQUENT CLOUD TO GROUND LIGHTNING...PEA SIZE HAIL...AND WIND GUSTS TO 50 MPH ARE LIKELY WITH THIS STORM. HEAVY RAINFALL WILL CAUSE PONDING OF WATER ON AREA ROADWAYS...ESPECIALLY THOSE IN POOR DRAINAGE AREAS. RESIDENTS ARE ENCOURAGED TO MONITOR THE SITUATION CLOSELY AND BE PREPARED TO TAKE THE PROPER ACTIONS SHOULD A WARNING BE ISSUED. SHAMBURGER
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The Jennings CO-OP Observer reported 6 inches of rain fell in Roanoke, causing widespread street flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2009Every state in 2009This day in weather historyWarnings in Louisiana, 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: 194710.