A deepening surface low formed across the ArkLaTex region in the early morning hours on December 1st. In the warm sector of the low, thunderstorms formed along a convergent axis almost parallel to the upper-level flow, which caused training to occur over an urban area (Baton Rouge).
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 deepening surface low formed across the ArkLaTex region in the early morning hours on December 1st. In the warm sector of the low, thunderstorms formed along a convergent axis almost parallel to the upper-level flow, which caused training to occur over an urban area (Baton Rouge). That same batch of convection eventually cold-pooled out and raced east when a bowing segment produced a very brief tornado in Pearl River county, aided by a surging rear-inflow jet. After that convection exited the area, another batch formed during the late evening hours, with one cell becoming dominant and producing golf ball sized hail before the whole complex weakened.
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 Dec 1, 3:20 AM CST, 1 hour 19 minutes earlier.
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</html>Special Weather Statement
National Weather Service New Orleans LA
408 AM CST Fri Dec 1 2023
LAZ080>084-011045-
Central Tangipahoa LA-Northern Livingston LA-Lower Tangipahoa LA-
Southern Livingston LA-Southwestern St. Tammany LA-
408 AM CST Fri Dec 1 2023
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF WEST CENTRAL ST.
TAMMANY, SOUTHEASTERN LIVINGSTON AND SOUTHERN TANGIPAHOA PARISHES
THROUGH 445 AM CST...
At 408 AM CST, Doppler radar was tracking a strong thunderstorm near
Whitehall, or 16 miles southwest of Hammond, moving east at 45 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Hammond, Ponchatoula, Albany, Springfield, Robert, Whitehall,
Natalbany, and Killian.
This includes the following Interstates...
Interstate 12 between mile markers 28 and 53.
Interstate 55 in Louisiana between mile markers 18 and 33.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3062 9027 3054 9024 3048 9024 3046 9021
3037 9017 3031 9047 3032 9047 3031 9049
3026 9073 3043 9080
TIME...MOT...LOC 1008Z 252DEG 39KT 3038 9069
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
PGSpecial Weather Statement
National Weather Service New Orleans LA
409 AM CST Fri Dec 1 2023
LAZ046-057-058-083>086-011045-
Iberville LA-Northern Livingston LA-Southern Livingston LA-
Western Ascension LA-St. John The Baptist LA-St. James LA-
Eastern Ascension LA-
409 AM CST Fri Dec 1 2023
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF WEST CENTRAL ST.
JOHN THE BAPTIST, ASCENSION, NORTHERN ST. JAMES, SOUTH CENTRAL
LIVINGSTON AND SOUTHEASTERN IBERVILLE PARISHES THROUGH 445 AM CST...
At 409 AM CST, Doppler radar was tracking a strong thunderstorm over
White Castle, or 8 miles northwest of Donaldsonville, moving east at
45 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Gonzales, Donaldsonville, St. Gabriel, White Castle, Sorrento, French
Settlement, Port Vincent, Prairieville, Geismar, Carville, and
Whitehall.
This includes Interstate 10 in Louisiana between mile markers 171 and
191.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3041 9069 3016 9060 3007 9106 3008 9108
3006 9109 3005 9116 3022 9122
TIME...MOT...LOC 1009Z 252DEG 39KT 3017 9112
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
PGSpecial Weather Statement
National Weather Service New Orleans LA
422 AM CST Fri Dec 1 2023
LAZ046-056-057-084>086-011100-
Iberville LA-Southern Livingston LA-Western Ascension LA-
Assumption LA-St. James LA-Eastern Ascension LA-
422 AM CST Fri Dec 1 2023
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF ASCENSION, CENTRAL
ST. JAMES, SOUTHERN LIVINGSTON, SOUTHEASTERN IBERVILLE AND NORTH
CENTRAL ASSUMPTION PARISHES THROUGH 500 AM CST...
At 422 AM CST, Doppler radar was tracking a strong thunderstorm near
Donaldsonville, moving east at 30 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Gonzales, Donaldsonville, St. Gabriel, Lutcher, Sorrento, Geismar,
Convent, and Belle Rose.
This includes Interstate 10 in Louisiana between mile markers 177 and
193.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3005 9116 3023 9107 3024 9067 2995 9076
TIME...MOT...LOC 1022Z 278DEG 25KT 3012 9105
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPHThe national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Public reported street flooding with road closures. Reported vehicles stranded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2023Every state in 2023This day in weather historyWarnings in Louisiana, December 2023
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: 1153148.