Isolated severe thunderstorms developed during the heat of the afternoon over southeast Louisiana.
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.
Isolated severe thunderstorms developed during the heat of the afternoon over southeast Louisiana.
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 3, 6:46 AM CST, 6 hours 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS LA 746 AM CDT SUN JUL 3 2011 .SOUNDING DISCUSSION... THIS MORNINGS FLIGHT INDICATED AN INCREASE IN MOISTURE FROM 700MB THROUGH THE 500MB LEVELS. SLIGHTLY COOLER TEMPERATURE PROFILE FROM YESTERDAY MORNINGS FLIGHT. LOW LEVEL WINDS HAVE VEERED FROM LAST NIGHTS 00Z FLIGHT. THE 12Z MEAN WINDS FROM THE SURFACE TO 5K FEET WAS WEST AT 7KT. MEAN WINDS FROM 5K TO 10K FT WAS EAST AT 8KT. JS && .PREV DISCUSSION... /ISSUED 312 AM CDT SUN JUL 3 2011/ SHORT TERM... ISOLATED SHOWERS ARE DEVELOPING MAINLY IN THE LOUISIANA COASTAL WATERS WEST OF THE MISSISSIPPI RIVER EARLY THIS MORNING. OTHERWISE FAIR WEATHER PREVAILS ACROSS SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. TEMPERATURES SHOULD RISE RATHER RAPIDLY THIS MORNING AND WILL REACH WELL INTO THE 90S BY NOON. LONG TERM... THE UPPER LEVEL RIDGE CURRENTLY OVER THE MID MISSISSIPPI VALLEY WILL SLOWLY RETROGRADE WEST OVER THE NEXT FEW DAYS AS AN UPPER LEVEL TROUGH MOVES FROM THE UPPER PLAINS AND THROUGH THE MID MISSISSIPPI VALLEY BY TUESDAY...LEAVING A WEAK TROUGH BEHIND IT. THIS TROUGH WILL EXTEND FROM CENTRAL TENNESSEE SOUTHWEST THROUGH THE CENTRAL GULF COAST STATES. TEMPERATURES SHOULD RETURN TO MORE NORMAL LEVELS AS THE UPPER LEVEL TROUGH ACTS AS A FOCUS FOR AFTERNOON AND EVENING THUNDERSTORMS. AVIATION... VFR CONDITIONS WILL PREVAIL AT EACH OF THE TAF SITES THROUGH SUNDAY NIGHT. AFTERNOON AND EARLY EVENING CONVECTION TODAY IS EXPECTED TO BE TOO ISOLATED IN NATURE TO INCLUDE IN THE TERMINAL FORECASTS AT THIS TIME. 11 MARINE... HIGH PRESSURE WILL CONTINUE TO DOMINATE THE NORTH GULF OF MEXICO THROUGH THE WORK WEEK. GENERALLY LIGHT SOUTHERLY...ALTHOUGH AT TIMES VARIABLE...WINDS WILL PREVAIL DURING THE PERIOD. 11 && .PRELIMINARY POINT TEMPS/POPS... MCB 98 70 98 70 / 20 20 20 20 BTR 99 73 97 72 / 20 20 20 20 ASD 96 74 96 74 / 20 20 20 20 MSY 96 76 95 76 / 20 20 20 20 GPT 94 75 95 73 / 20 20 20 20 PQL 94 74 94 74 / 20 20 20 20 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1144 AM CDT SUN JUL 3 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>082-041645- 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- 1144 AM CDT SUN JUL 3 2011 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 ISOLATED THUNDERSTORMS WILL DEVELOP DURING THE AFTERNOON AND PERSIST INTO EARLY EVENING. THE STRONGER THUNDERSTORMS WILL BE ACCOMPANIED BY GUSTY WINDS...FREQUENT CLOUD TO GROUND LIGHTNING AND LOCALLY HEAVY RAIN. A FEW OF THUNDERSTORMS COULD BE STRONG TO LOCALLY SEVERE WITH WIND GUSTS OF 40 TO 50 MPH. HEAT INDEX VALUES WILL RISE INTO THE 99 TO 105 DEGREE RANGE THIS AFTERNOON OUTSIDE OF RAIN AREAS. MINOR FLOODING CONTINUES ALONG THE ATCHAFALAYA RIVER AT MORGAN CITY. REFER TO THE LATEST RIVER FLOOD STATEMENT FOR DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ISOLATED THUNDERSTORMS ARE EXPECTED MONDAY...MAINLY DURING THE AFTERNOON AND EARLY EVENING HOURS. SCATTERED THUNDERSTORMS WILL BE POSSIBLE TUESDAY THROUGH FRIDAY. ALTHOUGH ORGANIZED SEVERE WEATHER IS NOT ANTICIPATED...A FEW STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE DURING THE PERIOD. THE MAIN THREATS WILL BE GUSTY TO DAMAGING WINDS...FREQUENT LIGHTNING...AND BRIEF HEAVY DOWNPOURS OF RAIN. HEAT INDEX VALUES WILL RISE INTO THE 98 TO 104 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 WILL NOT BE NEEDED.
LAZ039-MSZ071-031945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 156 PM CDT SUN JUL 3 2011 ...CLUSTER OF STRONG THUNDERSTORMS NEARLY STATIONARY AFFECTING WALTHALL COUNTY...WASHINGTON PARISH... AT 147 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS FROM SOUTH OF DEXTER TO NORTHEAST OF FRANKLINTON THE THUNDERSTORMS WERE NEARLY STATIONARY. THE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF NORTHERN WASHINGTON PARISH AND SOUTHERN WALTHALL COUNTY. THE PRIMARY THREAT FROM THESE STORMS IS WIND GUSTS TO NEAR 45 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. FREQUENT CLOUD TO GROUND LIGHTNING WILL ALSO ACCOMPANY THIS THUNDERSTORM.
LAZ039-040-071-072-032000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 209 PM CDT SUN JUL 3 2011 ...CLUSTER OF STRONG THUNDERSTORMS MOVING NORTHWEST AFFECTING ST. TAMMANY PARISH...WASHINGTON PARISH...TANGIPAHOA PARISH... AT 205 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED STRONG THUNDERSTORMS FROM NORTHEAST OF COVINGTON EXTENDING EASTWARD TO WEST OF INDEPENDENCE IN TANGIPAHOA PARISH. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...SUN...WILMER...FOLSOM...ENON AND BOGALUSA THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING AND WIND GUSTS TO NEAR 45 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.
LAZ060>062-032015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 210 PM CDT SUN JUL 3 2011 ...STRONG THUNDERSTORM MOVING NORTHWEST AFFECTING ST. CHARLES PARISH...ORLEANS PARISH...JEFFERSON PARISH... AT 205 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR DOWNTOWN NEW ORLEANS...MOVING NORTHWEST AT 5 MPH. THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND... AVONDALE...BRIDGE CITY...HARAHAN...WAGGAMAN...METAIRIE...KENNER AND THE NEW ORLEANS ARMSTRONG INTERNATIONAL AIRPORT. THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING AND 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. 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. 98/SO
The national radar mosaic for the moment the first event began.
2 thunderstorm wind. Local standard time, as filed.
The St. Tammany Parish Emergency Manager reported power lines down, tree branches down, and some roofing material off of outbuildings along Jack Fork Road outside of Folsom. Straight line winds estimated at 60 mph.
Broadcast media reported a tree downed and blocking the road at Beechwood Drive and Byron Avenue. A wind gust of 52 mph was recorded at the Baton Rouge Airport on the north side of Baton Rouge.
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: 311097, 311099.