Heavy rain produced isolated flash flooding in St. Martin Parish.
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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.
Heavy rain produced isolated flash flooding in St. Martin Parish.
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 Jul 26, 9:47 AM CST, 1 hour 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAKE CHARLES LA 1047 AM CDT TUE JUL 26 2011 .UPDATE...LOWERED AFTERNOON HIGHS SLIGHTLY AND BUMPED SKY COVER UP THROUGH THE REMAINDER OF TODAY. OTHERWISE ONGOING POPS FOR SCATTERED SHOWERS AND THUNDERSTORMS LOOK GOOD AND WILL NOT BE MAKING ANY ADDITIONAL ADJUSTMENTS. && MARCOTTE && .PREV DISCUSSION... /ISSUED 622 AM CDT TUE JUL 26 2011/ DISCUSSION... 12Z TAF ISSUANCE. AVIATION... LIKE YESTERDAY...SCT SHRA/TSRA DEVELOPED AROUND 09-10Z ACROSS THE COASTAL WATERS SOUTH OF VERMILION PARISH...AND SPREAD ACROSS S LA NEAR LCH EAST TO NEAR ARA. THE AREA IS EXPECTED TO GRADUALLY SPREAD/FORM N AND W AS THE MORNING AND AFTERNOON PROGRESSES. FOR THIS...HAVE VCTS FOR LCH/ARA/LFT ~12Z WITH TEMPO GROUPS FOR TSRA THRU 22Z. FOR BPT...LEFT VCTS BEGINNING AT 15Z...WITH TEMPO GROUP FOR TSRA & MVFR CEILING/VSBY FROM 18-22Z...AND ABOUT AN HOUR LATER FOR AEX. CONVECTION EXPECTED TO DISSIPATE AFTER 00Z THIS EVENING. PREV DISCUSSION... /ISSUED 403 AM CDT TUE JUL 26 2011/ DISCUSSION... SFC ANALYSIS THIS MORNING SHOWS HIGH PRESSURE SITUATED OVER THE CNTL GULF OF MEXICO KEEPING THE FORECAST AREA IN A LIGHT SRLY FLOW...MAINTAINING OUR PERSISTENT VERY MOIST AIRMASS (00Z KLCH SOUNDING PWAT OF 2.45 INCHES IS 145 PERCENT OF NORMAL). MEANWHILE WATER VAPOR IMAGERY SHOWS RIDGING IN PLACE ACROSS THE SRN ROCKIES AND SRN PLAINS WITH A SHORTWAVE DROPPING THROUGH THE OZARKS. REGIONAL 88DS BEGINNING TO SHOW ANOTHER NIGHT OF NOCTURNAL CONVECTION GETTING FIRED UP OVER THE COASTAL WATERS JUST WEST OF MARSH ISLAND...SIMILAR TO THIS TIME LAST NIGHT. EXPECTING ANOTHER DAY OF SCATTERED CONVECTION ACROSS THE FORECAST AREA TODAY AS THE COPIOUS GULF MOISTURE COMBINES FORCES WITH THE ADVANCING SHORTWAVE...MILD HEATING...AFTERNOON SEA BREEZE AND RESULTANT OUTFLOWS. BEST CHANCE OF RAIN AGAIN WILL BE OVER THE ATCHAFALAYA BASIN WHERE MOISTURE WILL BE DEEPEST...ALTHOUGH ALL ZONES HAVE BEEN KEPT IN THE CHANCE POP CATEGORY. ODDLY THOUGH THIS MORNING THE LATEST RUN OF THE NCEP 4.0KM WRF SHOWS ONLY A LIMITED AMOUNT OF CONVECTION TODAY. DESPITE THE RECENT RAINS FLASH FLOOD GUIDANCE REMAINS HIGH ACROSS THE FORECAST AREA SO NO WATCH IS IN THE WORKS ATTM. SHOWERS AND STORMS SHOULD AGAIN SIMMER DOWN AFTER SUNSET BEFORE NEXT ROUND OF SHOWERS DEVELOP PRIOR TO SUNRISE IN THIS PERSISTENT PATTERN. CARRIED OVER THE POP SCHEME FROM THE AFTERNOON FORECAST PACKAGE OF YESTERDAY WITH THESE CHANCE POPS LINGERING EACH DAY THROUGH FRIDAY BEFORE THE RIDGE INCHES SEWD TOWARD THE FORECAST AREA...ALLOWING THE AIRMASS TO DRY SOME AND MAYBE PUT A LITTLE LID ON CONVECTIVE DEVELOPMENT FOR THE WEEKEND. AT SUCH TIME TEMPS ACROSS THE NRN 1/2 OF THE AREA WILL WARM SIGNIFICANTLY WITH AFTERNOON HIGHS IN THE UPPER 90S...LOWER TO MID 90S FROM I-10 SWD. MARINE... POSITIONING OF THE SFC HIGH OVER THE NRN GULF WILL KEEP EITHER A SWRLY OR WRLY WIND OVER THE COASTAL WATERS THROUGH MID-WEEK. BY LATER IN THE WEEK THE HIGH WILL SHIFT BACK TO ITS MORE CLIMATOLOGICALLY FAVORED SERN CONUS/NERN GULF POSITIONING ALLOWING FOR A MORE TYPICAL SUMMERTIME SRLY FLOW. NO FLAGS ARE ANTICIPATED THROUGH THE PERIOD. && .PRELIMINARY POINT TEMPS/POPS... KLCH 90 78 93 79 92 / 40 40 40 40 40 KBPT 92 79 92 80 94 / 30 30 30 30 30 KAEX 90 76 95 76 94 / 50 50 50 50 50 KLFT 90 77 93 78 91 / 50 50 50 50 50 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...NONE. TX...NONE. GM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAKE CHARLES LA 534 AM CDT TUE JUL 26 2011 GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-051>055- TXZ180>182-201-215-216-271045- 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- 534 AM CDT TUE JUL 26 2011 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 SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED AGAIN THROUGH THIS EVENING AS A VERY MOIST AND UNSTABLE AIRMASS COMBINES WITH A WEAKNESS IN THE ATMOSPHERE ALOFT. ALTHOUGH SEVERE WEATHER IS NOT EXPECTED...A FEW OF THE STORMS COULD PRODUCE WIND GUSTS TO 40 MPH AND FREQUENT DANGEROUS LIGHTNING ALONG WITH HEAVY RAINS WHICH WILL QUICKLY RESULT IN PONDING OF WATER ON ROADWAYS. ON THE COASTAL WATERS THE STORMS WILL PRODUCE BRIEF GUSTY WINDS...ROUGH SEAS AND HEAVY RAINS REDUCING THE VISIBILITY TO A MILE OR LESS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED SHOWERS AND THUNDERSTORMS REMAIN IN THE FORECAST THROUGH THE END OF THE WORK WEEK AS THE WEATHER PATTERN CHANGES LITTLE IN THE COMING DAYS. BY THE WEEKEND HIGH PRESSURE ALOFT WILL INCH CLOSER TO THE AREA...WHICH WILL LOWER RAIN CHANCES SLIGHTLY FOR THE LATTER PORTION OF THE FORECAST PERIOD. SEVERE WEATHER IS NOT EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. 25
The Lake Charles radar (KLCH), 128 km away, was scanning. The volume nearest the first event began at 17:03 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused significant street flooding across parts of upper St. Martin Parish near Breaux Bridge. LA 347 and LA 328 had over a foot of water across the roads.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2011Every state in 2011This day in weather historyWarnings in Louisiana, July 2011
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: 336645.