Sea breeze interaction allowed the development of an isolated severe thunderstorm near the coast.
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.
Sea breeze interaction allowed the development of an isolated severe thunderstorm near the coast.
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 2, 2:22 PM CST, 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS LA 322 PM CDT SAT JUL 2 2011 .SHORT TERM... FORECAST AREA REMAINS ON THE SE PERIPHERY OF THE LARGE EXPANSIVE UPPER HIGH THAT EXTENDS FROM AZ TO THE LOWER OH VALLEY. EXPECT THIS PATTERN TO CONTINUE INTO SUNDAY. DAYTIME TEMPERATURE MOVE QUICKLY INTO THE MID 90S BY EARLY AFTERNOON. HOWEVER THE AREA IS DISPLACED FAR ENOUGH FROM THE CENTER OF THE HIGH FOR AT LEAST ISOLATED TO SCATTERED THUNDERSTORMS DEVELOP DUE TO STRONG DIFFERENTIAL HEATING AND LAKE OR SEA BREEZE CONVERGENCE. EXPECT AFTERNOON CONVECTION TO LINGER INTO THE EARLY EVENING...WITH ISOLATED ACTIVETY NEAR THE COAST AND COASTAL WATERS OVERNIGHT. A SIMILAR WEATUER PATTERN IS EXPECTED ON SUNDAY...HOT DAYTIME TEMPERATURES ALONG WITH A 20PCT THUNDERSTORM COVERAGE. ANOTHER POTENTIAL IMPACT WILL BE WEAK DISTURBANCES ALONG THE PERIPHERY OF THE UPPER HIGH. THE UPPER HIGH BEGINS TO SHIFT WESTWARD ON MONDAY AND TUESDAY AS A MID LEVEL TROUGH BEGINS TO DEVELOP OVER THE EASTERN THIRD OF THE COUNTRY WITH A WEAK TROUGH AXIS EXTENDING TOWARD THE CENTRAL GULF COAST. THIS SUBTLE CHANGE IN THE UPPER PATTERN WILL LEAD TO A SLIGHT INCREASE IN THUNDERSTORM COVERAGE WITH MAX TEMPS NUDGING DOWN A FEW DEGREES. AFTERNOON DEWPOINTS IN THE UPPER 60S TO MID 70S RANGE WILL HELP KEEP HEAT INDEX VALUES MAINLY IN THE 99 TO 105 DEGREE RANGE. .LONG TERM... MID WEEK INTO NEXT WEEKEND...MODELS CONTINUE TO INDICATE MID LEVEL TROUGH WILL EXTEND OVER THE EASTERN U.S. WITH WEAK TROUGH OR SHEAR AXIS EXTENDING ACROSS THE REGION. IN ADDITION...DEEPER MOISTURE PROFILES EXPECTED AS TROPICAL WAVE OVER CARIBBEAN AND ATLANTIC FORECAST TO MOVE INTO EASTERN GULF TOWARD THE WEEKEND. OVERALL TEMPERATURES WILL MODERATE AND RAIN CHANCE INCREASE IN THE LATTER HALF OF THE WEEK AND EARLY WEEKEND. .MARINE... THE HIGH PRESSURE RIDGE AXIS IS EXPECTED TO PERSIST OVER THE NORTH GULF OF MEXICO DURING MOST OF THE NEXT 5 DAYS WITH SUBTLE CHANGES TO THE ORIENTATION. OVERALL GRADIENT REMAINS WEAK...THERE WILL CONTINUE TO BE HIGHER WINDS OVER SOME OF THE EASTERN NEARSHORE WATERS DUE TO THE AFTERNOON SEABREEZE AND NOCTURNAL LOW LEVEL JET. MID WEEK AND BEYOND...SOME UNCERTAINTY IS THE WILL BE THE IMPACT OF ANY TROPICAL WAVE MOVING INTO THE SOUTHEAST GULF OF MEXICO. && .PRELIMINARY POINT TEMPS/POPS... MCB 71 95 72 94 / 20 20 20 20 BTR 74 96 74 94 / 20 20 20 20 ASD 75 95 74 94 / 30 20 20 20 MSY 77 95 77 91 / 30 20 20 20 GPT 76 95 75 93 / 30 20 20 20 PQL 74 95 73 94 / 30 20 20 20 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1127 AM CDT SAT JUL 2 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>082-031630- 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- 1127 AM CDT SAT JUL 2 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 BE POSSIBLE TODAY AND TONIGHT... PRIMARILY DURING THE AFTERNOON AND EARLY EVENING HOURS. ONE OR TWO OF THESE STORMS COULD BE STRONG TO POSSIBLY SEVERE WITH THE MAIN THREAT BEING DAMAGING WINDS. HEAT INDEX VALUES WILL RISE INTO THE 99 TO 105 DEGREE 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...SUNDAY THROUGH FRIDAY ISOLATED THUNDERSTORMS ARE EXPECTED SUNDAY AND 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. THE MAIN THREATS WILL BE GUSTY TO DAMAGING WINDS...FREQUENT LIGHTNING...AND BRIEF HEAVY DOWNPOURS. HEAT INDEX VALUES WILL RISE INTO THE 99 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
MSZ082-021845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 111 PM CDT SAT JUL 2 2011 ...CLUSTER OF STRONG THUNDERSTORMS MOVING SOUTHWEST AFFECTING JACKSON COUNTY... AT 102 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS NEAR ESCATAWPA...MOVING SOUTHWEST AT 5 MPH. THE STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...VANCLEAVE...MOSS POINT AND ESCATAWPA. THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT 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. FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. 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.
MSZ082-021945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 145 PM CDT SAT JUL 2 2011 ...CLUSTER OF STRONG THUNDERSTORMS NEARLY STATIONARY AFFECTING JACKSON COUNTY... AT 142 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS OVER PORTIONS OF JACKSON COUNTY THAT ARE GENERALLY NORTH OF INTERSTATE 10. THE THUNDERSTORMS ARE NEARLY STATIONARY. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...WADE...VANCLEAVE AND ESCATAWPA. THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT 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. FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. 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. 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. 95/DM
LAZ059-065>067-022000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 214 PM CDT SAT JUL 2 2011 ...STRONG THUNDERSTORM MOVING SOUTHWEST AFFECTING TERREBONNE PARISH...LAFOURCHE PARISH... AT 211 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 9 MILES SOUTHWEST OF LAROSE...OR ABOUT 4 MILES EAST OF MONTEGUT...MOVING SOUTHWEST AT 5 MPH. THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...MONTEGUT... DULAC AND CHAUVIN THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT 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 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. 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. 95/DM
LAZ065-066-022100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 302 PM CDT SAT JUL 2 2011 ...CLUSTER OF STRONG THUNDERSTORMS MOVING WEST AFFECTING TERREBONNE PARISH... AT 257 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 8 MILES SOUTH OF HOUMA...OR ABOUT 6 MILES WEST OF CHAUVIN...DRIFTING WEST AT 7 MPH. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...DULAC THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT 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. THIS STORM IS ALSO PRODUCING HEAVY RAINFALL WHICH MAY LEAD TO PONDING OF WATER ON LOW LYING ROADWAYS AND IN AREAS OF POOR DRAINAGE. FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. 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. 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. 95/DM
MSZ080-081-022130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 323 PM CDT SAT JUL 2 2011 ...STRONG THUNDERSTORM MOVING SOUTHWEST AFFECTING HANCOCK COUNTY... HARRISON COUNTY... AT 320 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 15 MILES NORTH OF GULFPORT...OR ABOUT 3 MILES SOUTHEAST OF SAUCIER...MOVING SOUTHWEST AT 5 MPH. THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...LYMAN. 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.
1 thunderstorm wind. Local standard time, as filed.
Terrebonne Parish Emergency Manager reported downed trees, downed power lines and an overturned trailer home in the Bobtown Community along Grand Calliou Road.
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: 311085.