Slow moving thunderstorms triggered minor flooding in several areas of Tangipahoa Parish.
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 triggered minor flooding in several areas of Tangipahoa 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 New Orleans, LA wrote its last area forecast discussion before the first event at Aug 19, 2:58 PM CST, 2 hours 2 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
358 PM CDT THU AUG 19 2010
.SYNOPSIS...
LATEST SURFACE ANALYSIS SHOWED THE 1016MB HIGH OVER THE CENTRAL
AND EASTERN GULF...SOUTHWEST FLOW OVER NORTH GULF AND NORTH
CENTRAL GULF COAST...AND STATIONARY BOUNDARY OVER MID SOUTH TO MID
ATLANTIC COAST. UPPER AIR ANALYSIS SHOWED AN ANTICYCLONIC
CIRCULATION OVER ARKANSAS AND ANOTHER NORTH FLORIDA...CREATING A
MOISTURE CONVERGENCE ZONE FROM SOUTHWEST LOUISIANA TO THE
CAROLINAS. CYCLONIC CIRCULATION ASSOCIATED WITH THE DECAYED
TROPICAL SYSTEM HAS MOVE NORTH OF THE FORECAST AREA. HOWEVER...PW
VALUES REMAIN AROUND 2.4 INCHES.
&&
.DISCUSSION...
WITH CYCLONIC CIRCULATION ASSOCIATED WITH THE REMNANTS OF
TROPICAL DEPRESSION FIVE WELL NORTH OF THE FORECAST AREA...THE
THREAT OF DEEP NIGHT TIME CONVECTION HAS DECREASED INLAND. LAST
SEVERAL NIGHTS ONLY SHOWERS HAVE DEVELOPED IN THE EARLY MORNING
HOURS. ERGO...RAIN CHANCES WILL BE SLIGHTLY LOWER ... STILL A
CHANCE IN THE EVENING. RADAR ESTIMATES FROM WEDNESDAY SHOWED 6 TO
8 INCHES OF RAINFALL ACROSS EXTREME WESTERN WILKINSON COUNTY AND
NORTHERN POINTE COUPEE PARISH. HIGH PW VALUES AND DEEP MOISTURE
WILL STILL YIELD ISOLATED SHOWERS INLAND AFTER MIDNIGHT TOWARD
FRIDAY MORNING. DRYING OCCURRED TO TODAY BUT EXCESSIVE RUNOFF IS
POSSIBLE WITH ANY STORM FOR THE REMAINDER OF THE AFTERNOON. IN
ADDITION...LATE AFTERNOON STORMS WITH A SLOW MOVEMENT WILL BE A
PROBLEM OVER RAIN SOAKED AREAS. ERGO...WILL ALLOW FLASH FLOOD
WATCH TO EXPIRE AT 7 PM THIS EVENING. MID LAYER ANTICYCLONIC FLOW
OR HIGH OVER FLORIDA WILL BUILD AND MOVE WEST OVER THE GULF COAST
REGION. SOME RELATIVELY MID LAYER DRY...OVER THE CENTRAL CARIBBEAN
AND EAST OF THE WAVE...WILL ADVECT NORTHWEST TO THE CENTRAL GULF
FRIDAY AND OVER SOUTHERN ZONES FRIDAY NIGHT. THIS COULD CURTAIL
RAIN CHANCES OVER THE COASTAL WATERS AND SOUTHERN ZONES FRIDAY
NIGHT INTO SATURDAY. HIGH WILL CONTINUE TO TRACK NORTHWEST OVER
TEXAS AND ALLOW THE OLD BOUNDARY AND ASSOCIATED MOISTURE TO SAG
SOUTH TO NORTH FLORIDA. WE COULD ESTABLISH MONTGOMERY STREAM
FUNCTIONS AND TRACK THIS AIR MASS WITH THETA-E VALUES TO SEE IF
THIS NEXT SYSTEM IS ASSOCIATED WITH THE REMNANTS...BUT WILL LEAVE
THAT TO RESEARCHERS. A WEAK INVERTED TROUGH OR WEAK LOW OVER
NORTHEAST GULF MONDAY AND TRACK WEST ACROSS THE NORTH GULF THROUGH
WEDNESDAY. HAVE INCREASED RAIN CHANCES UP TO 50 PERCENT EACH DAY
NEXT WEEK. LATER PACKAGES MAY INCREASE INCREASE RAIN CHANCES TO
LIKELY TUESDAY THROUGH FRIDAY OF NEXT WEEK.
&&
.AVIATION...
SCATTERED SHOWERS AND THUNDERSTORMS WILL DISSIPATE NEAR OR SHORTLY
AFTER SUNSET...WITH TEMPORARY MVFR/IFR CIGS/VSBYS IN CONVECTION.
OTHERWISE A FEW FAVORED SITES...KMCB...KHUM AND KHSA MAY SEE MVFR
VSBYS FOR A FEW HOURS AROUND SUNRISE. WILL HINT AT MORNING
CONVECTION WITH MENTION OF CB...BUT ANY WIDESPREAD CONVECTION ON
FRIDAY LIKELY TO BE NEAR OR AFTER 18Z. PROBABLY ABOUT 50 PERCENT
AREAL COVERAGE TOMORROW. 35
&&
.MARINE...
WEAK HIGH PRESSURE WILL REMAIN IN PLACE ACROSS THE COASTAL WATERS
THROUGH THE WEEKEND. THIS WILL RESULT IN WINDS NEAR OR BELOW 10
KNOTS AND SEAS LESS THAN 3 FEET. HOWEVER...LOCALLY HIGHER WINDS AND
SEAS CAN BE EXPECTED IN THE VICINITY OF ANY THUNDERSTORMS THAT DO
DEVELOP. TOWARD THE END OF THE WEEKEND...A WEAK FRONTAL BOUNDARY IS
FORECAST TO APPROACH THE GULF COAST. AS THE FRONT
APPROACHES...EXPECT WINDS AND SEAS TO PICK UP A BIT IN RESPONSE TO A
TIGHTENING PRESSURE GRADIENT. THE FRONT IS FORECAST TO STALL NEAR
THE COAST...PROVIDING A FOCUS FOR ADDITIONAL CONVECTION. 35
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 74 91 75 94 / 30 50 20 30
BTR 76 93 76 95 / 30 50 20 30
ASD 76 92 76 94 / 30 50 20 30
MSY 78 92 79 93 / 30 50 20 30
GPT 78 91 77 94 / 30 50 20 30
PQL 76 92 76 93 / 30 50 20 40
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH UNTIL 7 PM THURSDAY FOR THE FOLLOWING ZONES:
ASCENSION...ASSUMPTION...EAST BATON ROUGE...EAST
FELICIANA...IBERVILLE...LIVINGSTON...POINTE COUPEE...ST.
HELENA...ST. JAMES...ST. JOHN THE
BAPTIST...TANGIPAHOA...WASHINGTON...WEST BATON ROUGE...AND
WEST FELICIANA.
GM...NONE.
MS...FLASH FLOOD WATCH UNTIL 7 PM THURSDAY FOR THE FOLLOWING ZONES:
AMITE...PIKE...WALTHALL...AND WILKINSON.
GM...NONE.
&&HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1131 AM CDT THU AUG 19 2010 LAZ034>039-046>050-056>058-MSZ068>071-201200- POINTE COUPEE-WEST FELICIANA-EAST FELICIANA-ST. HELENA-TANGIPAHOA- WASHINGTON-IBERVILLE-WEST BATON ROUGE-EAST BATON ROUGE-ASCENSION- LIVINGSTON-ASSUMPTION-ST. JAMES-ST. JOHN THE BAPTIST-WILKINSON- AMITE-PIKE-WALTHALL- 1131 AM CDT THU AUG 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. .DAY ONE...THIS AFTERNOON AND TONIGHT HEAVY RAIN AND FLOODING... THE REMNANTS OF TROPICAL DEPRESSION FIVE AND ASSOCIATED TROPICAL MOISTURE WILL REMAIN ACROSS EAST CENTRAL AND SOUTH CENTRAL LOUISIANA AND SOUTHWEST MISSISSIPPI THIS AFTERNOON. SHOWERS AND THUNDERSTORMS WITH PERIODS OF HEAVY RAIN REMAIN POSSIBLE IN THESE AREAS WITH THE GREATEST FLOODING THREAT BEING OVER WEST AND EAST FELICIANA...POINTE COUPEE...WEST AND EAST BATON ROUGE AND IBERVILLE PARISHES AND WILKINSON AND AMITE COUNTIES. A FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED MAINLY AFTERNOON AND EARLY EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY FRIDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ040- 059>070-MSZ077-080>082-201200- 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-ST. TAMMANY-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-PEARL RIVER-HANCOCK-HARRISON- JACKSON- 1131 AM CDT THU AUG 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF COASTAL WATERS OF SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. .DAY ONE...THIS AFTERNOON AND TONIGHT THE REMNANTS OF TROPICAL DEPRESSION FIVE AND ASSOCIATED TROPICAL MOISTURE WILL REMAIN ACROSS SOUTHEASTERN LOUISIANA AND SOUTHERN MISSISSIPPI THIS AFTERNOON. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WITH HEAVY DOWNPOURS ARE POSSIBLE IN THESE AREAS WHICH MAY RESULT IN LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED MAINLY AFTERNOON AND EARLY EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY FRIDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
LAZ062-064-191900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 103 PM CDT THU AUG 19 2010 ...STRONG THUNDERSTORM NEARLY STATIONARY AFFECTING ST. BERNARD PARISH...ORLEANS PARISH... AT 100 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR CHALMETTE...OR ABOUT 3 MILES SOUTH OF LAKEFRONT AIRPORT. THE THUNDERSTORM WAS NEARLY STATIONARY. THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...LAKEFRONT AIRPORT AND NEW ORLEANS 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. IN ADDITION FUNNEL CLOUDS MAY BE POSSIBLE AND HAVE BEEN REPORTED WITH THIS STORM AND OTHER STORMS THAT DEVELOP ALONG THE INTERACTION OF THE LAKE BREEZE AND SEA BREEZE. CAB
LAZ038-192245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 445 PM CDT THU AUG 19 2010 ...CLUSTER OF NEARLY STATIONARY STRONG THUNDERSTORMS AFFECTING TANGIPAHOA PARISH... AT 442 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS OVER HAMMOND. THE THUNDERSTORMS WERE NEARLY STATIONARY. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...TICKFAW...HAMMOND...PONCHATOULA...INDEPENDENCE AND ROBERT THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING AND HEAVY RAINFALL. SEEK SHELTER IN A SAFE HOME OR BUILDING UNTIL THESE STORMS HAVE PASSED. THESE STORMS 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.
LAZ037-038-192330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 537 PM CDT THU AUG 19 2010 ...CLUSTER OF NEARLY STATIONARY STRONG THUNDERSTORMS TANGIPAHOA PARISH...ST. HELENA PARISH... AT 533 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 7 MILES NORTH OF AMITE...OR ABOUT 3 MILES SOUTH OF TANGIPAHOA. THE THUNDERSTORMS WERE NEARLY STATIONARY. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...WILMER...TANGIPAHOA AND KENTWOOD THE PRIMARY THREATS FROM THESE STORMS ARE CONTINUOUS LIGHTNING AND 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 THESE STORMS HAVE PASSED. THESE STORMS 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.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Thunderstorms produced street flooding in several areas of Hammond and surrounding portions of Tangipahoa Parish.
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: 254298.