An unstable airmass aided the development of isolated thunderstorms during the late afternoon. A funnel cloud was reported near Lake Pontchartrain.
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The episode as NWS LIX wrote it up.
An unstable airmass aided the development of isolated thunderstorms during the late afternoon. A funnel cloud was reported near Lake Pontchartrain.
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 Jun 26, 2:10 PM CST, 3 hours 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS LA 310 PM CDT SUN JUN 26 2011 .SYNOPSIS... HIGH PRESSURE IS CENTERED OVER THE FLORIDA PENINSULA WITH THE RIDGE AXIS EXTENDING WESTWARD ACROSS THE NORTHERN GULF OF MEXICO. A WEAK SURFACE LOW IS CENTERED OVER NORTHERN TEXAS WITH A DRYLINE EXTENDING FROM THE LOW SOUTHWARD INTO SOUTHWEST TEXAS. A STATIONARY FRONT EXTENDS FROM THE LOW EASTWARD THROUGH SOUTHERN MISSOURI...TENNESSEE AND NORTH CAROLINA. LOCALLY...TEMPERATURES ARE HOVERING IN THE LOW TO MID 90S. A WEAK SUBSIDENCE INVERSION WAS PRESENT IN THIS MORNING/S SOUNDING. WOULD NOT BE SURPRISED IF THIS EVENING/S SOUNDING SHOWS THAT THE INVERSION HAS STRENGTHENED. HAVE ONLY SEEN ABOUT FIVE LIGHT SHOWERS POP UP ON THE RADAR SCOPE THIS AFTERNOON...SO THE SUBSIDENCE SEEMS TO BE EFFICIENT AT KEEPING CONVECTION IN CHECK. && .DISCUSSION... RIDGING EXPECTED TO REMAIN IN PLACE OVER THE NEXT COUPLE DAYS RESULTING IN HIGHER THAN NORMAL AFTERNOON TEMPERATURES...LOW CHANCES OF RAIN AND ONLY PARTLY CLOUDY SKIES. DEWPOINTS WILL CONTINUE TO HOVER AROUND OR JUST ABOVE 70 DEGREES. AFTERNOON TEMPERATURES IN THE MID 90S WILL COMBINE WITH THESE HIGH DEWPOINTS TO RESULT IN PEAK HEAT INDEX VALUES NEAR OR OVER 100 DEGREES THROUGH MUCH OF THE PERIOD. THE HIGHEST VALUES ARE EXPECTED TUESDAY...WHEN SOME PLACES WILL SEE HEAT INDEX VALUES BETWEEN 105 AND 110 DEGREES. BY MIDWEEK...AN UPPER TROUGH WILL DIG SOUTHWARD ALONG THE EAST COAST. AS THE TROUGH DIGS SOUTHWARD...IT MAY FORCE A WEAK BACKDOOR FRONT INTO THE LOCAL AREA WHICH WOULD ENHANCE RAIN CHANCES WEDNESDAY THROUGH FRIDAY. CONCERNING THE TROPICAL WAVE CURRENTLY LOCATED OVER THE WESTERN CARIBBEAN...NEARLY ALL OF THE 12Z MODELS NOW HOLD ON TO THE SYSTEM AND REFLECT A WEAK CLOSED LOW BY TUESDAY NIGHT OVER THE BAY OF CAMPECHE OR THE EXTREME SOUTHWEST GULF OF MEXICO. THIS IS A CHANGE FROM JUST 12 HOURS AGO WHEN ONLY THE CANADIAN MODEL WAS SHOWING DEVELOPMENT OF THIS SYSTEM. REGARDLESS OF WHETHER THIS SYSTEM DEVELOPS OR NOT...IT WILL HAVE LITTLE TO NO IMPACT ON THE LOCAL AREA OTHER THAN SOME MINOR IMPLICATIONS OVER THE COASTAL WATERS. && .AVIATION... STRONG RIDGING ACROSS THE AREA WILL CONTINUE TO BRING VFR CONDITIONS TO ALL OF THE TERMINALS THROUGH THE FORECAST PERIOD. THERE IS THE POSSIBILITY OF A WEAK LOW LEVEL INVERSION DEVELOPING AROUND 10Z...WHICH COULD LEAD TO SOME PATCHY FOG DEVELOPMENT. FOG WILL BE MOST LIKELY AT KMCB...KHUM...AND POSSIBLY KBTR. ANY FOG WILL BE LIGHT...WITH VISIBILITIES ONLY DROPPING INTO MVFR RESTRICTIONS. THE FOG SHOULD QUICKLY BURN OFF AFTER SUNRISE...WITH VFR CONDITIONS RETURNING BY 14Z. && .MARINE... HIGH PRESSURE IS FORECAST TO REMAIN ROUGHLY IN PLACE OVER THE NEXT SEVERAL DAYS...RESULTING IN WINDS GENERALLY 10 KNOTS OR LESS. WAVES WILL ALSO REMAIN LOW FOR THROUGH MONDAY...BUT WILL GRADUALLY BUILD OVER THE FOLLOWING DAYS DUE TO A SWELL TRAIN MOVING OUT OF THE YUCATAN CHANNEL AND FLORIDA STRAITS AS A TROPICAL WAVE MOVES THROUGH THAT AREA. THIS WILL RESULT IN SEAS THAT ARE A COUPLE OF FEET HIGHER THAN WHAT WOULD NORMALLY BE EXPECTED WITH THE FORECAST WIND SPEEDS. THOUGH SOME WAVE MODELS INDICATE SEAS AS HIGH AS 6 OR 7 FEET...WILL CAP HEIGHTS AT 5 FEET FOR NOW DUE TO UNCERTAINTY IN HOW MUCH THE CARIBBEAN WAVE WILL DEVELOP AS IT MOVES WEST THROUGH THE BAY OF CAMPECHE AND INTO CENTRAL MEXICO. && .PRELIMINARY POINT TEMPS/POPS... MCB 73 95 73 96 / 10 10 10 10 BTR 74 95 74 95 / 10 10 10 10 ASD 74 92 74 93 / 10 10 10 10 MSY 77 93 77 93 / 10 10 10 10 GPT 75 92 74 93 / 10 10 10 10 PQL 72 93 72 94 / 10 10 10 10 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. && AVIATION...32 REST OF DISCUSSION...95/DM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1107 AM CDT SUN JUN 26 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>082-271615- 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- 1107 AM CDT SUN JUN 26 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 LATE AFTERNOON AND EARLY EVENING THUNDERSTORMS ARE POSSIBLE ALONG LAKE AND SEA BREEZE BOUNDARIES. ANY THUNDERSTORMS TODAY SHOULD BE BRIEF IN DURATION BUT CAPABLE OF PRODUCING DOWNBURST WINDS NEAR 50 MPH...A FEW LIGHTNING STRIKES AND BRIEF MODERATE TO HEAVY RAINFALL. HEAT INDEX READINGS WILL BE AROUND 100 DEGREES ACROSS MUCH OF THE AREA BETWEEN 2 PM AND 5 PM. THE MISSISSIPPI RIVER AT RED RIVER LANDING IS NEAR FLOOD STAGE. THE ATCHAFALAYA RIVER AT MORGAN CITY REMAINS IN MINOR FLOOD. REFER TO THE LATEST RIVER FLOOD STATEMENTS FOR DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ISOLATED AFTERNOON THUNDERSTORMS ASSOCIATED WITH THE SEA BREEZE ARE POSSIBLE MONDAY AND TUESDAY. A WEAK BACK DOOR FRONT FROM THE APPALACHIANS IS LIKELY TO SETTLE INTO THE OUTLOOK AREA DURING THE LATTER PART OF THE WEEK. THIS WILL SERVE AS A FOCUS FOR AFTERNOON THUNDERSTORMS AS IT INTERACTS WITH THE DAILY SEA BREEZE. STRONG TO SEVERE THUNDERSTORMS MAY BE POSSIBLE WEDNESDAY AND THURSDAY DUE TO A HIGH LIKELIHOOD OF DAMAGING DOWNBURST WINDS. HEAT INDEX READINGS IN THE 100 TO 110 RANGE ARE EXPECTED MONDAY AND TUESDAY BEFORE LOWERING SLIGHTLY INTO THE 97 TO 105 RANGE LATTER HALF OF THE WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TUESDAY. ACTIVATION MAY BE POSSIBLE FOR WEDNESDAY AND THURSDAY DEPENDING ON THE INTEGRITY OF THE WEAK FRONT ENTERING THE REGION FROM THE NORTHEAST.
The national radar mosaic for the moment the first event began.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was briefly observed by the weather observer at New Orleans International Airport. The funnel cloud was observed in the Destrehan area of St. Charles Parish.
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, June 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: 311073.