1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 May 10, 2:00 AM CST, 9 hours 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA 300 AM CDT MON MAY 10 2004 .DISCUSSION... TODAY WILL BE A NORMAL HIT AND MISS SH/TS DAY. WITHOUT DYNAMIC SUPPORT A MORE TYPICAL SUMMER DISTRIBUTION OF TS SHOLD OCCUR. BEING ON THE PERIPHERY OF THE ATLANTIC HIGH WILL GIVE AN OPEN DOOR TO GULF MOISTURE AND SINCE THE HIGH IS FAR ENOUGH AWAY...SUBSIDENCE SHOULDNT CREATE A STRONG CAP WHICH USUALLY KEEPS MOST TCU FROM FORMING INTO TS. SH/TS SHOULD DIE AS THE SUN SETS. TOMORROW WILL BE DIFFERENT. WE WILL STILL HAVE THE SAME MOIST ATMOSPHERE WITH NORMAL DESTABILIZATION DUE TO HEATING BUT SOME DYNAMIC SUPPORT WILL ALSO COME INTO PLAY. WEAK DISTURBANCES ALOFT WILL MOVE ACROSS THE AREA IN THE SUPPORTING SW FLOW. THE UPPER HIGH TO THE SOUTH AND THE UPPER TROUGH OUT WEST WILL CAUSE THE 300MB FLOW TO SPLIT MAINLY ACROSS THE COASTAL BEND OF TX AND LA. THIS WILL ALSO ENHANCE THE CHANCES OF SH/TS OVER THE AREA. THIS TYPE OF SCENARIO STAYS WITH US THROUGH FRIDAY BEFORE TAPPERING OFF. FOR THESE REASONS...WE WILL BE INCREASING POPS FOR TODAY THROUGH FRIDAY AND BRINGING THEM TO LIKELY TOMORROW. WITH TYPICAL AIRMASS TS TODAY...DO NOT EXPECT ANY SEVERITY BESIDES DOWNBURSTING STRONG WINDS. AS SOME DYNAMIC SUPPORT BEGINS TO AID IN DEVELOPMENT AND LIFE OF TS...A FEW MAY BECOME STRONG TO SEVERE. WILL HIGHLITE IN HWO AS WELL. THE MAJOR PROBLEM WILL BE WITH HEAVY RAIN PRODUCING TS AS STEERING WINDS BECOME WEAK AND STORM MOTION BECOMES SLOW(TOWARD NE 10MPH). PWS MOVE INTO THE 1.70+ AREA BY TUESDAY WHICH INDICATES A VERY MOIST ATMOSPHERE SUPPORTING HEAVY RAIN. WITH THE SLOW STORM MOTION AND HEAVY RAIN EXPECTED...SOME SMALL SCALE FLOODING IS A POSSIBILITY. WILL NOT MENTION ANY FLOODING PROBLEMS AT THIS TIME BUT LATER SHIFTS MAY LOOK INTO THIS FURTHER. && .PRELIMINARY POINT TEMP/POPS... MCB 85 64 81 65 / 30 10 50 20 BTR 85 65 80 66 / 30 10 60 30 MSY 85 68 80 69 / 40 20 60 30 GPT 81 69 80 69 / 30 20 60 40 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. MS...NONE. SE LA AND MS COASTAL WATERS...NONE. && 17
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT MON MAY 10 2004 LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-111200- AMITE-ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK- HARRISON-IBERVILLE-JACKSON-LIVINGSTON-LOWER JEFFERSON- LOWER LAFOURCHE-LOWER PLAQUEMINES-LOWER ST BERNARD-LOWER TERREBONNE- ORLEANS-PEARL RIVER-PIKE-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- WALTHALL-WASHINGTON-WEST BATON ROUGE-WEST FELICIANA-WILKINSON- 1100AM CDT MON MAY 10 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST LOUISIANA AND EXTREME SOUTHWEST...SOUTH CENTRAL AND COASTAL MISSISSIPPI. .DAY ONE...TODAY AND TONIGHT A DEEP MOIST ATMOSPHERE COUPLED WITH DAYTIME HEATING WILL MAKE WATERSPOUTS POSSIBLE WITH THE STRONGER THUNDERSTORMS THROUGH THIS EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THUNDERSTORMS ARE EXPECTED TUESDAY THROUGH SATURDAY. A FEW THUNDERSTORMS MAY BECOME STRONG AND AN ISOLATED SEVERE THUNDERSTORM IS POSSIBLE EACH DAY. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND EMERGENCY MANAGEMENT PERSONNEL...IN SUPPORT OF SEVERE WEATHER OPERATIONS...IS NOT REQUESTED.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Torrential rainfall overwhelmed local drainage and caused flash flooding in and near Slidell. Parish officials estimated water entered approximately 60 homes. Numerous streets were impassable due to high water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2004Every state in 2004This day in weather historyWarnings in Louisiana, May 2004
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: 5397679.