Isolated strong to severe thunderstorms developed in a moist and very unstable atmosphere.
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 strong to severe thunderstorms developed in a moist and very unstable atmosphere.
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 28, 9:00 AM CST, 5 hours earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1000 AM CDT SUN JUN 28 2009
.DISCUSSION...THE HEAT IS ON...AGAIN AND AGAIN AND AGAIN. WITH
MUCH LESS COVERAGE OF SHRA AND TSRA EXPECTED TODAY OVER THE SOUTH
SHORE AND COASTAL PARISHES WE HAVE DECIDED TO EXPAND THE HEAT ADV
SOUTH TO INCLUDE ALL OF THE CWA. MORNING LOWS WERE QUITE WARM THIS
MORNING AND WITH MOST LIKELY ONLY ISLTD AREAS SEEING RELIEF FROM
AFTN CONVECTION IT SHOULD NOT BE TOO HARD TO SEE AFTN HEAT
INDICIES HOVER AROUND THE 105 MARK. IN ADDITION TO THAT WE ARE
LOOKING AT THE POSSIBILITY OF HAVING TO EXTEND THE HEAT ADV INTO
TOMORROW. A LOT WILL DEPEND ON THE STRENGTH AND SPEED OF OUR FRONT
TOMORROW MORNING. RIGHT OUT AHEAD OF THE FRONT IT COULD GET QUITE
MISERABLE WITH MOISTURE POOLING UP AND ADDITIONAL WARMING FROM
COMPRESSIONAL HEATING. AS FOR THE REST OF THE FCST SO FAR SO GOOD.
HRLY TEMPS ARE JUST ABOUT ON TRACK. I WILL LEAVE THE 10% ISLTD
WORDING IN FOR THE COASTAL COUNTIES/PARISHES AND THE SOUTH SHORE
BUT I WOULD NOT BE SURPRISED TO NOT SEE MUCH CONVECTION TODAY. NPW
HAS ALREADY BEEN SENT FOR THE HEAT ADV AND ZONES AND GRIDS WILL BE
OUT SHORTLY. /CAB/
...SOUNDING DISCUSSION...
NO PROBLEMS WITH THE FLIGHT THIS MORNING. ANOTHER HOT DAY IN STORE
AS THE SOUNDING SHOWS A FORECAST HIGH OF 96 WHICH SEEMS MORE THAN
REASONABLE IF NOT A TOUCH LOW NORTH OF THE LAKE. MOISTURE LEVELS
REMAIN HIGH WITH THE PW AT 1.83 INCHES...SO HEAT INDICIES WILL
ONCE AGAIN BE IN THE 105-110 RANGE DURING THE PEAK HEATING OF THE
DAY. THERE IS A BIT OF A WARM NOSE ON THE SOUNDING AROUND 800 MB
AND A LACK OF ANYTHING TO TRIGGER CONVECTION TODAY...ALTHOUGH A
FEW ISOLATED SHOWERS CANNOT BE TOTALLY RULED OUT ESPECIALLY SOUTH
OF THE LAKE AND NEAR THE COASTAL AREAS. ANY SHOWERS THAT DO
DEVELOP WILL BE SLOW MOVERS AGAIN TODAY WITH LIGHT AND VARIABLE
WINDS AGAIN THROUGHOUT A GOOD PORTION OF THE SOUNDING.
98/SO
&&
.PREV DISCUSSION... /ISSUED 428 AM CDT SUN JUN 28 2009/
DISCUSSION...
NOT TO REPEAT THE OBVIOUS...BUT ANOTHER HOT DAY IS
IN THE BOOKS AND ANOTHER ONE IS ON TAP FOR TODAY. SURFACE ANALYSIS
SHOWED A WEAK GRADIENT ACROSS THE NORTH GULF AND CENTRAL GULF
COAST. IN ADDITION...A VERY DEEP 985MB LOW WAS LOCATED JUST NORTH
OF MINNESOTA WITH A TRAILING FRONT SOUTH ACROSS THE GREAT LAKES
SOUTHWEST TO NORTH CENTRAL TEXAS. UPPER LEVEL ANALYSIS SHOWED THE
HIGH OVER NORTH TEXAS AND SOUTH OKLAHOMA WITH RIDGE AXIS EAST FOR
NORTH LOUISIANA AND NORTH MISSISSIPPI. A NEGATIVELY TILTED OVER
NORTHERN MINNESOTA AND NORTHWEST FLOW FROM MISSOURI TO MONTANA.
THE SOUTHERN PORTION OF THE WAVE WAS BUCKING UP AGAINST THE
WEST/EAST RIDGE AXIS. IR SATELLITE IMAGERY SHOWED THE CONVECTION
FROM SOUTHWEST MISSOURI TO WEST CENTRAL OKLAHOMA...ALONG THE
FRONTAL BOUNDARY. WE HAVE NOT FORGOTTEN THE FORECAST PROBLEM NEAR
THE YUCATAN.
SHORT RANGE MODELS ARE IN CLOSE AGREEMENT OVER THE NEXT 48 HOURS WITH
THE FRONT. UPPER LEVEL LOW AND SURFACE LOW WILL DIVE SOUTHEAST
ACROSS THE GREAT LAKES LATE TODAY THROUGH MONDAY NIGHT. A VIGOROUS
AXIS ROTATING ON BACKSIDE WILL HELP DRIVE THE FRONT DOWN
SIDE...PUSH THE MAIN UPPER HIGH WEST AND CREATE A MOISTURE
CONVERGENCE ACROSS THE AREA MONDAY. WILL MAINTAIN CHANCE POPS FOR
MONDAY. WITH SEVERAL WAVES ROTATING AROUND THE MAIN LOW ACROSS THE
MID MISSISSIPPI VALLEY AND OHIO VALLEY TUESDAY THROUGH
FRIDAY....FRONTAL BOUNDARY WILL NOT RETREAT NORTH OR PUSH
COMPLETELY INTO THE GULF. WITH THE SYSTEM OVER SOUTHEAST
GULF...EXPECTING SOME MOVEMENT TO THE CENTRAL GULF AND MOISTURE WILL
LIKELY CONVERGE ALONG THE BOUNDARY STARTING WEDNESDAY THROUGH
FRIDAY. WILL MAINTAIN A CHANCE WELL OFFSHORE AND CONVECTION MAY BE
NUMEROUS ACROSS THE COASTAL WATERS WEDNESDAY THROUGH FRIDAY.
RELUCTANT TO KNOCK DOWN TEMPS ACROSS NORTH HALF OF THE FORECAST
LATE IN THE WEEK. A NORTHWEST MOIST FLOW MAY DEVELOP OVER THE
AREA NEXT WEEK...A STEP CLOSER TO NORMS IS POSSIBLE NEXT WEEKEND.
MEANWHILE...HEAT FOR TODAY WILL MAINTAIN ADVISORY THROUGH TODAY AS
THE UPPER LEVEL RIDGE PUSHES THROUGH. INCREASE RAIN THREAT EARLY
MONDAY MAY PROVIDE SOME RELIEF.
&&
.AVIATION...
.12Z TAF ISSUANCE...
VFR SHOULD CONTINUE FOR MOST SITES THROUGH THE PERIOD. SOME 2SM BR
MAY SHOW UP FOR A SHORT TIME AT MCB AND EVEN LIGHTER ELSEWHERE. SOME
SCT040 SHOULD BE THE MAJOR SKY COVER TODAY. ISOLATED TS ACTIVITY IS
EXPECTED BUT SHOULD NOT AFFECT ANY TERMINALS. SOME ACTIVITY MAY
CLOSE IN ON THE MCB TERMINAL EARLY MONDAY MORNING BUT WILL LEAVE OUT
FOR NOW WITH LOW CONFIDENCE.
&&
.MARINE...
EXPECT THE WEAK FRONTAL THROUGH TO MOVE TO THE COAST MONDAY NIGHT.
LIGHT WEST AND SOUTHWEST WINDS MAY BRIEFLY SHIFT TO THE NORTH OVER
THE 0-20NM ZONES BEFORE SHIFTING BACK TO A SOUTHERLY DIRECTION. THE
FRONT WILL GRADUALLY DISSIPATE THROUGH TUESDAY NIGHT. A STRONG
TROPICAL WAVE MOVING OVER THE YUCATAN PENINSULA IS EXPECTED TO
ENTER THE SOUTHERN GULF IN A FEW DAYS. VERY SLOW...IF
ANY...DEVELOPMENT IS EXPECTED AS IT MOVES BACK OVER THE GULF. THE
DEEP MOISTURE ASSOCIATED WITH THE WAVE WILL SLOWLY MAKE ITS WAY
NORTHWARD INTO THE LOUISIANA/MISSISSIPPI COASTAL WATERS BY THURSDAY
OR FRIDAY.
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 99 74 94 68 / 10 20 30 20
BTR 99 76 98 71 / 10 20 30 20
MSY 96 79 95 77 / 10 20 30 30
GPT 95 77 93 71 / 10 20 30 30
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...HEAT ADVISORY UNTIL 7 PM SUNDAY FOR THE FOLLOWING ZONES:
ASCENSION...ASSUMPTION...EAST BATON ROUGE...EAST
FELICIANA...IBERVILLE...LIVINGSTON...LOWER
JEFFERSON...LOWER LAFOURCHE...LOWER PLAQUEMINES...LOWER ST.
BERNARD...LOWER TERREBONNE...ORLEANS...POINTE COUPEE...ST.
CHARLES...ST. HELENA...ST. JAMES...ST. JOHN THE
BAPTIST...ST. TAMMANY...TANGIPAHOA...UPPER
JEFFERSON...UPPER LAFOURCHE...UPPER PLAQUEMINES...UPPER ST.
BERNARD...UPPER TERREBONNE...WASHINGTON...WEST BATON
ROUGE...AND WEST FELICIANA.
GM...NONE.
MS...HEAT ADVISORY UNTIL 7 PM SUNDAY FOR THE FOLLOWING ZONES:
AMITE...HANCOCK...HARRISON...JACKSON...PEARL
RIVER...PIKE...WALTHALL...AND WILKINSON.
GM...NONE.
&&
CABHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1129 AM CDT SUN JUN 28 2009 GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077- 080>082-291630- LAKE PONTCHARTRAIN AND LAKE MAUREPAS- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM- COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER OUT 20 NM- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO LOWER ATCHAFALAYA RIVER LA FROM 20 TO 60 NM- COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA- EAST FELICIANA-ST. HELENA-TANGIPAHOA-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-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER- HANCOCK-HARRISON-JACKSON- 1129 AM CDT SUN JUN 28 2009 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 ABOVE NORMAL TEMPERATURES WILL PERSIST TODAY. EXPECT HEAT INDEX VALUES NEAR 105 DEGREES AND POSSIBLY HIGHER IN ISOLATED AREAS THIS AFTERNOON. AS A RESULT...A HEAT ADVISORY IS NOW IN EFFECT FOR ALL OF THE OUTLOOK AREA. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE THREAT OF RAIN INCREASES MONDAY THROUGH WEDNESDAY. SLIGHTLY HIGHER RAIN CHANCES WILL PROVIDE A LITTLE HEAT RELIEF. A COLD FRONT IS EXPECTED TO STALL OVER THE AREA AND PROVIDE A FOCUS FOR THUNDERSTORM DEVELOPMENT MONDAY THROUGH WEDNESDAY. HOWEVER...NO SEVERE WEATHER IS EXPECTED MONDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER OPERATIONS IS NOT ANTICIPATE THROUGH SUNDAY...JULY 5TH. CAB
The national radar mosaic for the moment the first event began.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew a tree down which fell on a carport and storage building.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2009Every state in 2009This day in weather historyWarnings in Louisiana, June 2009
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: 181159.