Slow moving thunderstorms produced isolated flooding south and west of New Orleans.
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 LIX wrote it up.
Slow moving thunderstorms produced isolated flooding south and west of New Orleans.
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 New Orleans, LA wrote its last area forecast discussion before the first event at Aug 29, 2:45 AM CST, 1 hour 20 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
345 AM CDT SUN AUG 29 2010
.SHORT TERM...
LONG FETCH OF TROPICAL MOISTURE CONTINUES TO AFFECT THE AREA. VERY
WEAK SFC LOW OVER THE NW GULF WILL HELP THIS SCENARIO CONINUE
THROUGH A GOOD PART OF THE WEEK WITH SOME MOVEMENT TO THE WEST. A
DRY AIR SURGE ASSOCIATED WITH A HIGH WILL MOVE SW FROM THE EAST
COAST SHOVING THE HEAVY RAIN AWAY FROM THE AREA BY THU. A
WEAKNESS WILL DEVELOP ACROSS THE CENTRAL GULF FROM FLA TO SOUTHERN
TX BY THE END OF THE WEEK AND A FRONT WILL MOVE IN FROM THE NORTH
AND STALL OVER THE SOUTHERN STATES. DRY AIR BETWEEN THESE TWO
WEAKNESSES WILL GET SQUEEZED AND RAIN MAY FALL BACK INTO THE FCAST
BY THE WEEKEND.
.AVIATION...
A VERY UNSETTLED WEATHER PATTERN WILL CONTINUE ACROSS THE
AREA...WITH MVFR CEILINGS EXPECTED AT MOST OF THE TERMINALS THROUGH
14Z. AT KMCB...SOME LOWER IFR CEILINGS WILL BE POSSIBLE TONIGHT.
IN ADDITION TO THE LOW CLOUD DECK...SCATTERED CONVECTION WILL
CONTINUE TO DEVELOP THROUGH THE FORECAST PERIOD. THIS CONVECTIVE
ACTIVITY WILL PRODUCE IFR CEILING AND VISIBILITY RESTRICTIONS AS IT
MOVES THROUGH A TAF SITE. THE CONVECTIVE ACTIVITY IS HARD TO TIME
EXACTLY...BUT THE DIURNAL MAXIMUM FOR CONVECTION WILL GENERALLY BE
BETWEEN 18 AND 22Z. DUE TO THIS...HAVE PUT IN A TEMPO GROUP TO
REFLECT THIS INCREASED RISK OF THUNDERSTORM ACTIVITY. 32
&&
.MARINE...
STRONG EASTERLY FLOW OF 15 TO 20 KNOTS AND SEAS OF 4 TO 6 FEET WILL
CONTINUE TO IMPACT THE COASTAL WATERS FOR THE NEXT SEVERAL DAYS...AS
A STRONG GRADIENT BETWEEN A LOW OVER THE GULF OF MEXICO AND A HIGH
OVER THE MID-ATLANTIC STATES REMAINS IN PLACE. THIS GRADIENT FLOW
WILL BEGIN TO WEAKEN BY NEXT WEEKEND AS THE LOW OVER THE GULF MOVES
TOWARD TEXAS AND THE AREA OF HIGH PRESSURE BECOMES CENTERED OVER THE
GULF SOUTH. 32
&&
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 87 71 88 70 / 70 40 40 30
BTR 87 74 91 74 / 60 30 30 30
ASD 87 75 87 74 / 80 40 50 40
MSY 87 76 88 77 / 80 40 50 40
GPT 84 75 85 74 / 80 50 50 40
PQL 84 74 85 72 / 80 50 50 30
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH UNTIL 7 PM SUNDAY FOR THE FOLLOWING ZONES:
ASSUMPTION...LOWER JEFFERSON...LOWER LAFOURCHE...LOWER
PLAQUEMINES...LOWER ST. BERNARD...LOWER
TERREBONNE...ORLEANS...ST. CHARLES...ST. JAMES...ST. JOHN
THE BAPTIST...ST. TAMMANY...UPPER JEFFERSON...UPPER
LAFOURCHE...UPPER PLAQUEMINES...UPPER ST. BERNARD...AND
UPPER TERREBONNE.
GM...SMALL CRAFT ADVISORY UNTIL 7 AM SUNDAY FOR THE FOLLOWING ZONES:
COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST PASS OF
THE MISSISSIPPI RIVER OUT 20 NM...COASTAL WATERS FROM
PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO 60 NM...COASTAL
WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA OUT 20
NM...COASTAL WATERS FROM STAKE ISLAND LA TO THE SOUTHWEST
PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM...COASTAL
WATERS FROM THE PORT FOURCHON TO LOWER ATCHAFALAYA RIVER
FROM 20 TO 60 NM...COASTAL WATERS FROM THE PORT FOURCHON TO
LOWER ATCHAFALAYA RIVER OUT 20 NM...COASTAL WATERS FROM THE
SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON
FROM 20 TO 60 NM...AND COASTAL WATERS FROM THE SOUTHWEST
PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON OUT 20 NM.
MS...FLASH FLOOD WATCH UNTIL 7 PM SUNDAY FOR THE FOLLOWING ZONES:
HANCOCK...HARRISON...JACKSON...AND PEARL RIVER.
&&HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 700 PM CDT SAT AUG 28 2010 GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>040- 046>050-056>070-MSZ068>071-077-080>082-292030- LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND- LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND- COASTAL WATERS FROM THE PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT 20 NM- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON OUT 20 NM- COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER OUT 20 NM- COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA OUT 20 NM- COASTAL WATERS FROM THE PORT FOURCHON TO LOWER ATCHAFALAYA RIVER FROM 20 TO 60 NM- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON FROM 20 TO 60 NM- COASTAL WATERS FROM STAKE ISLAND LA TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM- COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA-EAST FELICIANA-ST. HELENA- TANGIPAHOA-WASHINGTON-ST. TAMMANY-IBERVILLE-WEST BATON ROUGE- EAST BATON ROUGE-ASCENSION-LIVINGSTON-ASSUMPTION-ST. JAMES- ST. JOHN THE BAPTIST-UPPER LAFOURCHE-ST. CHARLES-UPPER JEFFERSON- ORLEANS-UPPER PLAQUEMINES-UPPER ST. BERNARD-UPPER TERREBONNE- LOWER TERREBONNE-LOWER LAFOURCHE-LOWER JEFFERSON- LOWER PLAQUEMINES-LOWER ST. BERNARD-WILKINSON-AMITE-PIKE-WALTHALL- PEARL RIVER-HANCOCK-HARRISON-JACKSON- 700 PM CDT SAT AUG 28 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF COASTAL WATERS OF SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. .DAY ONE...TONIGHT SHOWERS AND THUNDERSTORMS... NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS WILL PREVAIL OVERNIGHT...ESPECIALLY SOUTHEAST OF A LINE FROM PIERRE PART TO POPLARVILLE. ABUNDANT MOISTURE...A NEARLY STATIONARY BOUNDARY DRAPED ACROSS SOUTHEAST LOUISIANA...AND A FEW OTHER FEATURES WILL COMBINE TO PRODUCE LOCALLY HEAVY RAIN OVER THE AREA. RAINFALL TOTALS OF 2 TO 4 INCHES WITH ISOLATED HIGHER AMOUNTS WILL BE POSSIBLE THROUGH SUNDAY EVENING. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR AREAS MAINLY ALONG AND SOUTH OF A LINE FROM PIERRE PART...TO POPLARVILLE...TO WADE. ALSO...A FEW THUNDERSTORMS COULD PRODUCE WIND GUSTS IN EXCESS OF 40 MPH. MARINE... A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH TONIGHT FOR ALL OF THE COASTAL WATERS WITH THE EXCEPTION OF THE SOUNDS AND LAKES. A LARGE AREA OF HIGH PRESSURE OVER THE EASTERN SEABOARD AND WEAK LOW PRESSURE IN THE WESTERN GULF IS LEADING TO STRONG SOUTHEASTERLY WINDS. WINDS NEAR 20 KNOTS WITH FREQUENT HIGHER GUSTS WILL BE POSSIBLE...WITH SEAS 5 TO 7 FEET OFFSHORE. SMALL CRAFT WILL NEED TO EXERCISE CAUTION ON LAKE BORGNE AND THE SOUNDS AS 15 TO 20 KNOT WINDS ARE EXPECTED. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A FLASH FLOOD WATCH IS IN EFFECT UNTIL 7 PM SUNDAY EVENING. NUMEROUS SHOWERS AND A FEW THUNDERSTORMS...SOME WITH HEAVY RAINFALL...ARE EXPECTED TO CONTINUE INTO SUNDAY. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED MONDAY THROUGH FRIDAY. GUSTY WINDS...FREQUENT LIGHTNING AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THE STRONGER STORMS. PERSISTENT EAST TO SOUTHEAST WINDS WILL CAUSE TIDES TO RISE ABOVE NORMAL ACROSS THE COAST AND TIDAL LAKES...ESPECIALLY DURING THE EARLY PART OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT OPERATIONS IS NOT EXPECTED. HOWEVER...PLEASE REPORT ANY FLASH FLOODING TO YOUR LOCAL LAW ENFORCEMENT OR EMERGENCY OPERATIONS.
LAZ059>062-067-290900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 301 AM CDT SUN AUG 29 2010 ...STRONG THUNDERSTORM MOVING NORTH AFFECTING ST. CHARLES PARISH... JEFFERSON PARISH...ORLEANS PARISH...LAFOURCHE PARISH... AT 254 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR CUT OFF...OR ABOUT 3 MILES NORTHEAST OF CUT OFF...MOVING NORTH AT 25 MPH. THE PRIMARY THREAT FROM THIS STORM IS WIND GUSTS TO NEAR 40 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE HOME OR BUILDING UNTIL THIS STORM HAS PASSED. THIS STORM COULD PRODUCE RAINFALL AMOUNTS OF ONE TO TWO INCHES IN A SHORT PERIOD OF TIME...RESULTING IN PONDING OF WATER AROUND LOW LYING ROADWAYS. REMEMBER...DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE DEPTH MAY BE TOO GREAT TO ALLOW A SAFE CROSSING. BE PREPARED TO TAKE QUICK ACTION IF A WARNING IS ISSUED. STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE LOCAL MEDIA OUTLETS FOR FURTHER DETAILS OR UPDATES FROM THE NATIONAL WEATHER SERVICE.
The national radar mosaic for the moment the first event began.
2 flash flood. Local standard time, as filed.
Seven inches of rain produced flooding of five homes in Des Allemands, Bayou Gauche, Boutte and Paradis.
Heavy rain produced flooding in central and southern portions of Lafourche Parish. Several roads were closed by the flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2010Every state in 2010This day in weather historyWarnings in Louisiana, August 2010
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: 253921, 254290.