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).
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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, 5:37 AM CST, 4 hours 58 minutes earlier.
Area Forecast Discussion
National Weather Service New Orleans LA
537 AM CST Fri Dec 1 2023
...New AVIATION...
.SHORT TERM...
(Today through Saturday)
Issued at 135 AM CST Fri Dec 1 2023
First of 3 disturbances moving through this morning and should be
out of the area by 10am today. This does not mean that the rain will
shut down, just the heaviest and strongest storms will decrease into
mainly rain showers and a few storms. The cold front will remain
stalled giving these disturbances an interface to move along and
ahead of. The next disturbance begins to move into the area from the
west around midnight tonight. We should have a good bit of the area
in the warm sector and sfc based, so this disturbance will have just
as much potential for strong or severe storms and heavy rainfall
once again overnight tonight. SPC and WPC continue the marginal risk
of severe and excessive rainfall, respectively. And this looks well
placed at the moment as well as being the appropriate level of risk.
This second disturbance will move out of the area by 6am Sat but as
the front remains stalled a line of sh/ts will remain behind this
jet level speed max. This line of sh/ts should remain for much if
not all day as it sloooowwwwllly moves SE. The last of these
disturbances will actually be the cold front moving through late Sat
evening into early Sun morning. This will be the last round as the
front should clean the area. There is also the potential for some
advective fog tonight into Sat morning. The set up is pretty good
with a cold front stalled to the NW, source region dew pts at 76F
along with a high RH field. Winds up to 1kft are directly from the
source region to the cooler shelf waters with del(sourcedewT-SST) of
10+F. SST near the coast and in the lakes are running from the mid
50s to about 60. This is a marine fog setup but some of this may
move inland as well especially at the coast.
&&
.LONG TERM...
(Saturday night through Thursday)
Issued at 135 AM CST Fri Dec 1 2023
Reinforcing surges of deep dry air will visit through next week.
These will be new cold fronts but there is little response time for
moisture to flow back into the area since the deep upper troughing
is over the eastern half of the country. There does not look to be
any rain days in the new week at the moment. But we will begin to
focus on fog more ahead of or along each frontal boundary.
&&
.AVIATION...
(12Z TAFS)
Issued at 533 AM CST Fri Dec 1 2023
A slow moving band of showers and thunderstorms associated with a
stalled frontal boundary over the region will gradually diminish
in intensity and dissipate over the next few hours. Before this
occurs, periods of MVFR and IFR visibility restrictions and low
ceilings of 500 to 1000 feet are forecast to impact HDC, ASD, GPT
and to a lesser extent HUM, MSY, and NEW. By 16z, the convective
band should be dissipated and prevailing MVFR and VFR conditions
will take hold at nearly all of the terminals. Only MCB is
expected to remain in IFR conditions as a low stratus deck lingers
on the northern side of a stalled frontal boundary. After 00z,
another period of rain and thunderstorms is expected to develop.
This period of rain and thunderstorms will last through the end of
the forecast period and is expected to produce a prolonged period
of IFR ceilings and visibilties tonight. PG
&&
.AVIATION...
(12Z TAFS)
Issued at 135 AM CST Fri Dec 1 2023
Cigs will be all over the place today through tonight. Starting with
VFR and falling this morning into at least MVFR with some of the
northern sites visiting IFR. Rain and some patchy fog this morning
will help bring vis down to MVFR levels and a few terminals may even
get to IFR for a short time especially if hit with a +TSRA. All
sites should have at the very least SHRA and most should see TSRA
this morning with a weakening of these storms during the morning
hours and remaining that way for much of the day. Another rounds of
these cigs, vis and TSRA restrictions will visity the area once
again tonight.
&&
.MARINE...
Issued at 135 AM CST Fri Dec 1 2023
A stalled front inland will retain an onshore flow over the northern
gulf today through Sat. This will also help set up the nearshore
waters and other navigable waterways with marine fog tonight into
Sat morning. A cold front will finally move through the northern
gulf Sunday with NW winds around 15kt but gusty. These winds will
gradually shift to N then NE by Wed. Winds will then quickly shift
to easterly by Thu and remain in that direction through the end of
the week with some small fluctuations. Wind speeds will mostly be 10-
15kt but some higher winds around 20kt could temporarily move over
the gulf with successive reinforcing frontal passages.
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 63 71 55 68 / 90 90 50 0
BTR 67 75 58 72 / 90 80 40 0
ASD 64 74 59 71 / 90 90 70 10
MSY 66 74 63 69 / 80 90 60 10
GPT 63 72 61 70 / 90 90 70 20
PQL 63 75 60 73 / 90 100 80 20
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...Small Craft Advisory until 9 AM CST this morning for GMZ530-532-
534-536-538-550-552-555-557-570-572.
Small Craft Advisory until 3 PM CST this afternoon for GMZ575-
577.
MS...None.
GM...Small Craft Advisory until 9 AM CST this morning for GMZ532-534-
536-538-550-552-555-557-570-572.
Small Craft Advisory until 3 PM CST this afternoon for GMZ577.
&&
SHORT TERM...TE
LONG TERM....TE
AVIATION...PG
MARINE...TE<!doctype html>
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</html>The national radar mosaic for the moment the first event began.
1 hail. Local standard time, as filed.
Picture of large hail estimated to be around golf ball size near Labadieville. Relayed by broadcast media.
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 2026-10-01. Each event’s entry at NCEI: 1153150.