A slow moving frontal boundary stalled across the area. At the same time, the morning upper air sounding showed atmospheric moisture in the column to be well over 2 inches.
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.
A slow moving frontal boundary stalled across the area. At the same time, the morning upper air sounding showed atmospheric moisture in the column to be well over 2 inches. High moisture combined with a slow moving focus created an environment conducive for heavy rainfall.
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 10, 2:45 AM CST, 5 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service New Orleans LA 345 AM CDT Wed Jun 10 2020 .SHORT TERM... A front is on its way to the area today. Its hard to call it a cold front as temps behind it will be hotter than they have been for several days now. But it will be drier which is going to feel a lot better if you are in the shade. Nights will be nice though as temps should also cool off more than they have the last several days. The line accompanying the front will move through this morning and should be through by mid afternoon. Some of the thunderstorms along the line could be strong to low end severe. This may be more of a concern after daylight when heating can be taken advantage of causing even better lift. .LONG TERM... Overall the extended forecast looks quiet however the models are struggling with the evolution of the ridge over the Plains and the a s/w dropping down out of Canada this weekend. The weekend will be quiet nice for June. The ridge axis will still be to the west with dry air over the region initally. The airmass will begin to slowly moisten but dewpoints should remain in the 60s for the most part (may be in the upper 50s Saturday morning in a few places still) while LL temps warm up with H925 temps of around 22-24C on Saturday and 23-25C on Sunday. This will yeild highs in the upper 80s to near 90 Saturday and then mostly lower 90s on Sunday. Heading into next week is a little more uncertain. Most of the ensembles suggest an unusal pattern setting up with a deep closed low developing around the Great Lakes and dropping south over the eastern CONUS. This along with the ridge remaining just off to the west may keep the region under mostly northerly flow. This would also keep the bulk of the hot airmass off to the west as well. /CAB/ && .AVIATION...Most if not all terminals will get a few sh/ts today. These conditions should cause MVFR to possibly IFR cigs and especially vis restrictions during the time of TSRA but outside this activity VFR should be the rule. VFR at all terminals overnight. && .MARINE... A frontal boundary will move through the northern gulf tonight. This will bring northerly winds to all coastal waters through the end of the week. The initial surge of northerly winds should be around 20kt tonight and slowly ease during the day Thursday. These winds will have a diurnal flux. Basically, they will rise overnight to around 20kt and ease during the day to around 10kt as stability decreases and increases respectfully over the coastal waters. Winds will slowly ease with each passing night as the gradient settles through the weekend into the new week. && .PRELIMINARY POINT TEMPS/POPS... MCB 89 66 86 65 / 30 0 0 0 BTR 90 66 86 65 / 30 0 0 0 ASD 91 67 88 66 / 60 0 0 0 MSY 90 72 86 71 / 60 0 0 0 GPT 87 68 86 67 / 70 10 0 0 PQL 89 66 88 65 / 70 10 0 0 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. &&
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</html>Special Weather Statement
National Weather Service New Orleans LA
600 AM CDT Wed Jun 10 2020
LAZ034-101145-
Pointe Coupee-
600 AM CDT Wed Jun 10 2020
...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN POINTE COUPEE
PARISH...
At 600 AM CDT, a strong thunderstorm was located near Melville,
moving southeast at 20 mph.
Winds in excess of 40 mph are possible with this storm.
Locations impacted include...
New Roads, Livonia, Fordoche and Lottie.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 3062 9174 3066 9175 3067 9173 3071 9173
3074 9175 3071 9144 3049 9158 3050 9175
3051 9173 3056 9176 3061 9176
TIME...MOT...LOC 1100Z 293DEG 17KT 3064 9182Special Weather Statement
National Weather Service New Orleans LA
630 AM CDT Wed Jun 10 2020
LAZ040-101215-
St. Tammany-
630 AM CDT Wed Jun 10 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ST. TAMMANY PARISH...
At 630 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Madisonville to near New Orleans.
Movement was northeast at 20 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Slidell, Covington, Pearl River, Abita Springs, Madisonville, Sun,
Bush, Lacombe, Pearlington and Slidell Airport.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3064 8982 3062 8983 3055 8979 3046 8969
3040 8968 3034 8963 3025 8963 3020 8959
3019 8976 3022 8985 3025 8987 3026 8998
3032 9001 3037 9010 3038 9018 3041 9019
3067 8999 3067 8985
TIME...MOT...LOC 1130Z 215DEG 16KT 3041 9012 3010 8999Special Weather Statement
National Weather Service New Orleans LA
805 AM CDT Wed Jun 10 2020
LAZ040-MSZ077-080-081-101400-
St. Tammany-Harrison-Hancock-Pearl River-
805 AM CDT Wed Jun 10 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ST.
TAMMANY PARISH...HARRISON...HANCOCK AND SOUTHEASTERN PEARL RIVER
COUNTIES...
At 804 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 12 miles east of Mcneil to near Lake
Catherine. Movement was east at 15 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Gulfport, Biloxi, Long Beach, Bay St. Louis, Waveland, Diamondhead,
St. Martin, D'iberville, Kiln, Pearlington, Lyman, Shoreline Park,
Stennis Space Center, Saucier, Latimer and Gulfport Airport.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3042 8901 3040 8889 3036 8928 3037 8935
3033 8938 3033 8937 3034 8934 3025 8942
3018 8945 3019 8949 3016 8966 3018 8968
3017 8972 3070 8948 3069 8934 3065 8934
3065 8925 3068 8924 3067 8889 3043 8888
TIME...MOT...LOC 1304Z 269DEG 12KT 3064 8944 3009 8972
24/RRSpecial Weather Statement
National Weather Service New Orleans LA
806 AM CDT Wed Jun 10 2020
LAZ063-064-067>070-101400-
Lower Plaquemines-Upper St. Bernard-Lower Jefferson-Lower St.
Bernard-Lower Lafourche-Upper Plaquemines-
806 AM CDT Wed Jun 10 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL ST. BERNARD...
SOUTHEASTERN LAFOURCHE...SOUTHEASTERN JEFFERSON AND NORTHWESTERN
PLAQUEMINES PARISHES...
At 806 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Lake Catherine to near Leeville.
Movement was east at 15 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Port Sulphur, Myrtle Grove, Shell Beach, Pointe A La Hache and
Leeville.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 2993 8980 2996 8973 2987 8962 3008 8949
3005 8938 2973 8953 2975 8965 2967 8957
2961 8973 2953 8968 2934 8981 2935 8998
2925 8998 2935 9003 2931 9013 2925 9010
2926 9005 2925 9006 2922 9029
TIME...MOT...LOC 1306Z 256DEG 15KT 3007 8965 2930 9022
24/RRSpecial Weather Statement
National Weather Service New Orleans LA
847 AM CDT Wed Jun 10 2020
MSZ081-082-101445-
Jackson-Harrison-
847 AM CDT Wed Jun 10 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL HARRISON AND
JACKSON COUNTIES...
At 847 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Lyman to near Waveland. Movement was
east at 25 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Gulfport, Biloxi, Ocean Springs, Long Beach, Moss Point, St. Martin,
Escatawpa, Gautier, D'iberville, Wade, Latimer, Big Point, Lyman,
Helena, Gulf Hills, Hurley, Vancleave, Gulf Park Estates, Hickory
Hills and Gulfport Airport.
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3036 8845 3033 8845 3032 8850 3037 8861
3036 8861 3034 8873 3037 8885 3038 8878
3043 8884 3043 8893 3042 8901 3040 8886
3038 8907 3031 8929 3067 8903 3067 8889
3073 8888 3074 8841 3035 8840
TIME...MOT...LOC 1347Z 256DEG 22KT 3053 8910 3023 8933
24/RRThe national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Social media pictures showed flooding of several roadways across the city of New Orleans. In some cases, the water was 3 to 4 feet deep.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2020Every state in 2020This day in weather historyWarnings in Louisiana, June 2020
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: 899389.