A stationary front focused the development of thunderstorms across southeast Louisiana. Several reports of severe weather were received from one of the storms.
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.
A stationary front focused the development of thunderstorms across southeast Louisiana. Several reports of severe weather were received from one of the storms.
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 Jul 1, 3:11 PM CST, 2 hours 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS LA 411 PM CDT FRI JUL 1 2011 .DISCUSSION...NO SIGNIFICANT CHANGES TO FORECAST AS TYPICAL NONDESCRIPT PATTERN REMAINS IN PLACE. JUST ISOLATED CONVECTION INITIATED MOSTLY BY LAKE AND LAND BREEZE DYNAMICS. TEMPERATURES NEAR NORMAL WITH CONTINENTAL AIRMASS INFLUENCES BEFORE BECOMING TRULY MARITIME LATER IN THE FORECAST PERIOD. && .AVIATION... VFR ALL TERMINALS NEXT 24-36 HOURS. && .MARINE... LIGHT WINDS AND LOW SEAS NEXT 5 DAYS WITH FLAT PRESSURE FIELD OVER NORTH GULF. && .PRELIMINARY POINT TEMPS/POPS... MCB 70 96 71 95 / 10 10 10 20 BTR 74 96 73 96 / 20 10 10 20 ASD 73 95 75 94 / 20 20 10 20 MSY 77 94 77 93 / 20 20 10 20 GPT 75 95 76 94 / 20 20 10 20 PQL 71 95 74 92 / 20 20 10 20 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. && 24/RR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1042 AM CDT FRI JUL 1 2011 GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037- 039-040-046>050-056>072-MSZ068>071-077-080>082-021545- LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND- LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND- COASTAL WATERS FROM 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 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- 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-NORTHERN TANGIPAHOA- SOUTHERN TANGIPAHOA-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER- HANCOCK-HARRISON-JACKSON- 1042 AM CDT FRI JUL 1 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF COASTAL WATERS OF SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE EXPECTED MAINLY DURING THE AFTERNOON HOURS. A FEW OF THE STORMS COULD PRODUCE GUSTY WINDS...FREQUENT LIGHTNING...AND BRIEF HEAVY DOWNPOURS...BUT SEVERE WEATHER IS NOT EXPECTED. AFTERNOON TEMPERATURES REACHING THE MID 90S WILL COMBINE WITH MODERATE HUMIDITY LEVELS RESULTING IN HEAT INDEX VALUES OF 100 TO 105 DEGREES IN SOME LOCATIONS THIS AFTERNOON. THE LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY HAS ISSUED AN OZONE ACTION DAY FOR BOTH THE NEW ORLEANS AND BATON ROUGE AREAS TODAY. MINOR FLOODING CONTINUES ALONG THE ATCHAFALAYA RIVER AT MORGAN CITY. REFER TO THE LATEST RIVER FLOOD STATEMENT FOR DETAILS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED THUNDERSTORMS ARE EXPECTED SATURDAY AND SUNDAY...MAINLY DURING THE AFTERNOON AND EARLY EVENING HOURS. SCATTERED THUNDERSTORMS WILL BE POSSIBLE MONDAY THROUGH THURSDAY. ALTHOUGH ORGANIZED SEVERE WEATHER IS NOT ANTICIPATED...A FEW STRONG THUNDERSTORMS WILL BE POSSIBLE. THE MAIN THREATS WILL BE GUSTY WINDS...FREQUENT LIGHTNING...AND BRIEF HEAVY DOWNPOURS. HEAT INDEX VALUES WILL RISE INTO THE 100 TO 105 DEGREE RANGE EACH AFTERNOON OUTSIDE OF RAIN AREAS. MINOR FLOODING WILL CONTINUE ALONG THE ATCHAFALAYA RIVER AT MORGAN CITY. REFER TO THE LATEST RIVER FLOOD STATEMENT FOR DETAILS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. 95/DM
LAZ060>063-012000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 226 PM CDT FRI JUL 1 2011 ...STRONG THUNDERSTORM NEARLY STATIONARY AFFECTING ST. CHARLES PARISH...ORLEANS PARISH...JEFFERSON PARISH...PLAQUEMINES PARISH... AT 225 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR HARVEY...OR ABOUT 3 MILES SOUTH OF HARVEY. THE THUNDERSTORM WAS NEARLY STATIONARY. THE STRONG THUNDERSTORM WILL BE NEAR... JEAN LAFITTE...8 MILES NORTH OF BARATARIA AND 9 MILES NORTH OF LAFITTE BY 300 PM... THE PRIMARY THREAT FROM THIS STORM IS WIND GUSTS 35 TO 45 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. FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. 24/RR
The national radar mosaic for the moment the first event began.
3 thunderstorm wind. Local standard time, as filed.
The Livingston Parish Emergency Manager reported tree damage, power lines down, and some damage to an apartment complex along Eden Church Road near U.S. Highway 190 between Walker and Denham Springs.
Livingston Parish Sheriff's Department reported trees down along Gaylord Road in the southern portion of Walker.
One tree was blown down and a trampoline was overturned in a yard, along with pea size hail, along Walker South Road to the south of the town of Walker.
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: 311082, 311083, 311081.