Alert archive / Louisiana / Flash Flood Warnings in 2024

Flash Flood Warning 33, NWS New Orleans, LA

April 10, 2024Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Apr 10, 2024, 9:00 AM CDT for Saint Tammany Parish, Louisiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 10, 2024, 9:00 AM CDT (14:00 UTC)
Expired: Apr 10, 2024, 12:00 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Saint Tammany Parish, LA

The radar

The Hammond radar (KHDC), 45 km from the middle of the area, began a volume at 14:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.0 hours before the alert went out and 30 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1088 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 479 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Apr 10, 6:57 AM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Apr 10, 6:57 AM CDT, 2 hours 3 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
657 AM CDT Wed Apr 10 2024

...New UPDATE...

.UPDATE...
Issued at 656 AM CDT Wed Apr 10 2024

Starting the wind advisory now as winds have rapidly risen to 30
to 40 mph for many locations and this area is rapidly moving
north this morning.

&&

.SHORT TERM...
(Today through Thursday)
Issued at 215 AM CDT Wed Apr 10 2024

The 800mb sub inversion from the 00z sounding is currently being
eroded(moving east). This inversion was stronger on the 12z sounding
yesterday and found at 875mb. This has protected us so far, but this
is currently leaving and in its place will be sfc based convective
instability that should strengthen with time this morning. PWs will
go up and convective temps will go down(was 90F yesterday). Advected
CAPE will also rise through the morning. All guidance brings the
main sfc low NE into northern LA later this morning. As this occurs,
it will cause frontogenesis supporting the line of storms that will
race eastward taking advantage of a more volatile environment to the
south of the sfc low since areas to the north have been worked over.
The flooding potential is also an issue today mainly over the
northern half of the area and the flood watch area looks well
placed. As the sub inversion erodes, we should see sh/ts begin to
develop very soon this morning ahead of the main line that moves
through the area which should start between 7 and 8am. The line of
storms that will be rolling through is developing in a line from
Laredo NEward at the time of this writing. This line is already
showing some QLCS features along with mesos and wind gusts to 37kt.
The line itself is speeding up and moving ENE at around 35-40kt. We
will leave all headlines as is this morning. A cold front will move
through the area this evening around or just after dark. The line of
storms that moves ahead of this boundary will cool things down
enough to help cause some stability, but the upper levels will
remain divergent until the front moves through. A dry slot will move
over the area by late tonight and early Thu then the back side of
the sfc low will reach us bringing low deck cloudy skies to the area
for most of Thu with a final clearing Thu evening.

&&

.LONG TERM...
(Thursday night through Tuesday)
Issued at 215 AM CDT Wed Apr 10 2024

Conditions look dry and nice for the weekend, and the next system
that impacts the area looks to be toward the end of next week.

&&

.AVIATION...
(12Z TAFS)
Issued at 215 AM CDT Wed Apr 10 2024

IFR to LIFR cigs will move into IFR to MVFR cigs later this morning
but will not lift to VFR cigs until late tonight when clearing
should take place. Some development of TSRA will take place this
morning over several terminals but all terminals will eventually be
impacted by a line of strong/severe TS moving through the area
starting around 7am and ending by mid afternoon. There will be a few
sh/ts still remaining until a cold front passes by this evening.

&&

.MARINE...
Issued at 215 AM CDT Wed Apr 10 2024

Southerly winds will rise further into the upper 20kt range this
morning and into the lower 30kt range by mid morning. Frequent gusts
well above gale force will keep the gale warning posted for today. A
lull back into mid 20kt range for 4 to 6 hours overnight as the
front moves through and back to gales once again with westerly to NW
winds for Thu. Instead of confusing headlines, we have kept the gale
warning for the entire time frame even through the lower wind
speeds. There is a good chance of strong/severe storms over most
marine areas today into the evening hours. Winds will ease back into
the 5-10kt range Thu night and even light and variable Fri and Fri
night with return flow beginning again over the weekend.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  75  54  72  48 / 100  30   0   0
BTR  80  58  77  51 / 100  30   0   0
ASD  79  59  76  52 / 100  20   0   0
MSY  79  61  75  57 / 100  10   0   0
GPT  75  59  75  52 / 100  50   0   0
PQL  78  60  75  50 /  90  70   0   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flood Watch through this evening for LAZ034>037-039-071.

     Wind Advisory until 6 PM CDT this evening for LAZ034>037-039-
     046>048-056>060-064>071-076>090.

     Coastal Flood Advisory until 6 PM CDT this evening for LAZ069-
     070-076-078.

GM...Gale Warning until 10 AM CDT Thursday for GMZ530-532-534-536-538-
     550-552-555-557-570-572-575-577.

MS...Flood Watch through this evening for MSZ068>071-077.

     Wind Advisory until 6 PM CDT this evening for MSZ068>071-077-
     083>088.

     Coastal Flood Advisory until 6 PM CDT this evening for MSZ086-
     087.

GM...Gale Warning until 10 AM CDT Thursday for GMZ532-534-536-538-550-
     552-555-557-570-572-575-577.

&&

SHORT TERM...TE
LONG TERM....TE
AVIATION...TE
MARINE...TE

In the hours before

Special weather statement, Apr 10, 5:26 AM CDT, 3 hours 34 minutes before

Special Weather Statement
National Weather Service New Orleans LA
526 AM CDT Wed Apr 10 2024

LAZ046-056-057-085-101100-
Iberville LA-Western Ascension LA-Assumption LA-St. James LA-
526 AM CDT Wed Apr 10 2024

...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF SOUTHWESTERN
ASCENSION, SOUTHWESTERN ST. JAMES, SOUTHEASTERN IBERVILLE AND
ASSUMPTION PARISHES THROUGH 600 AM CDT
...

At 525 AM CDT, Doppler radar was tracking a strong thunderstorm
capable of producing funnel clouds near Bayou Geneve, or near Belle
River, moving northeast at 20 mph.

HAZARD...Funnel clouds and winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...If a funnel cloud briefly touches down, minor damage to
         outdoor objects is possible. Gusty winds could knock down
         tree limbs and blow around unsecured objects.

Locations impacted include...
Donaldsonville, Napoleonville, Supreme, Paincourtville, Belle Rose,
and Convent.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3012 9114 3003 9073 2979 9110 2981 9110
      2984 9113 2984 9119 2987 9121
TIME...MOT...LOC 1025Z 209DEG 16KT 2987 9112

FUNNEL CLOUDS...POSSIBLE
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CAB

Local storm report, Apr 10, 8:30 AM CDT, 30 minutes before

Preliminary Local Storm Report
National Weather Service New Orleans LA
830 AM CDT Wed Apr 10 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 AM     Tstm Wnd Gst     2 NW New Roads          30.72N 91.48W
04/10/2024  M62 MPH          Pointe Coupee      LA   AWOS

            AWOS station KHZR New Roads.

&&

Local storm report, Apr 10, 8:34 AM CDT, 26 minutes before

Preliminary Local Storm Report
National Weather Service New Orleans LA
834 AM CDT Wed Apr 10 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 AM     Tstm Wnd Dmg     St. Francisville        30.79N 91.37W
04/10/2024                   West Feliciana     LA   Trained Spotter

            Report of a building damaged in St.
            Francisville.

&&

LNN

Local storm report, Apr 10, 8:35 AM CDT, 25 minutes before

Preliminary Local Storm Report
National Weather Service New Orleans LA
835 AM CDT Wed Apr 10 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0830 AM     Tstm Wnd Gst     1 ENE St. Francisville  30.79N 91.37W
04/10/2024  E60 MPH          West Feliciana     LA   Trained Spotter

&&

LNN

Special weather statement, Apr 10, 8:39 AM CDT, 21 minutes before

Special Weather Statement
National Weather Service New Orleans LA
839 AM CDT Wed Apr 10 2024

MSZ083-084-086-087-101430-
Southern Harrison MS-Northern Hancock MS-Southern Hancock MS-
Northern Harrison MS-
839 AM CDT Wed Apr 10 2024

...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF WESTERN HARRISON AND
HANCOCK COUNTIES THROUGH 930 AM CDT
...

At 838 AM CDT, Doppler radar was tracking a strong thunderstorm over
Bay St. Louis, moving north at 55 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Bay St. Louis, Waveland, Diamondhead, Saucier, Kiln, Shoreline Park,
Pearlington, and Lyman.

This includes Interstate 10 in Mississippi between mile markers 4 and
28.

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.

A Tornado Watch remains in effect until 100 PM CDT for southeastern
Louisiana...and southern Mississippi.

&&

LAT...LON 3031 8923 3030 8932 3027 8939 3018 8946
      3018 8953 3020 8954 3018 8957 3022 8960
      3052 8957 3052 8954 3064 8954 3065 8925
      3068 8924 3067 8910
TIME...MOT...LOC 1338Z 193DEG 47KT 3035 8934

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

HRL

Local storm report, Apr 10, 8:59 AM CDT, 1 minute before

Preliminary Local Storm Report
National Weather Service New Orleans LA
859 AM CDT Wed Apr 10 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0832 AM     Tstm Wnd Dmg     2 E Port Allen          30.45N 91.17W
04/10/2024                   East Baton Rouge   LA   Public

            Tree down at N 19th and Main.

&&

DM

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 8:28 PM CDT	River Flood Warning	LIX	Washington	4 days
Apr 9, 8:28 PM CDT	River Flood Warning	LIX	Saint Tammany	21 days
Apr 10, 5:26 AM CDT	Special Weather Statement	LIX	Assumption, Saint James	34 min
Apr 10, 5:51 AM CDT	Severe Thunderstorm Warning	LIX	Assumption, Saint James	54 min
Apr 10, 6:23 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	67 min
Apr 10, 6:44 AM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	46 min
Apr 10, 6:55 AM CDT	Tornado Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	25 min
Apr 10, 7:17 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint James, Saint John the Baptist	43 min
Apr 10, 7:32 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	4 hr
Apr 10, 7:45 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	60 min
Apr 10, 7:50 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles	40 min
Apr 10, 8:02 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Lafourche, Livingston, Saint Charles, Saint James and 1 more	43 min
Apr 10, 8:06 AM CDT	Tornado Warning Considerable damage threat	LIX	East Feliciana, Pointe Coupee, West Feliciana	24 min
Apr 10, 8:24 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	66 min
Apr 10, 8:35 AM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Livingston, Saint Helena, Tangipahoa, Washington	55 min
Apr 10, 8:41 AM CDT	Flash Flood Warning	LIX	Ascension, Livingston, Saint Charles, Saint James, Saint John the Baptist	3 hr
Apr 10, 8:41 AM CDT	Tornado Warning	LIX	Saint Tammany	28 min
Apr 10, 8:54 AM CDT	Flash Flood Warning	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana	3 hr
Apr 10, 9:05 AM CDT	Special Marine Warning	LIX		55 min
Apr 10, 9:05 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Lafourche, Livingston, Saint Charles, Saint James and 1 more	55 min
Apr 10, 9:14 AM CDT	Flash Flood Warning Emergency	LIX	Tangipahoa	5 hr
Apr 10, 9:20 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	55 min
Apr 10, 9:23 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Orleans, Saint Tammany, Tangipahoa, Washington	82 min
Apr 10, 9:26 AM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Apr 10, 9:40 AM CDT	Flash Flood Warning Considerable damage threat	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James	3 hr
Apr 10, 9:53 AM CDT	Tornado Warning	LIX	Saint Tammany	52 min
Apr 10, 9:57 AM CDT	Special Marine Warning	LIX		48 min
Apr 10, 9:59 AM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint Tammany	46 min
Apr 10, 10:08 AM CDT	Tornado Warning	LIX	Saint Tammany	52 min
Apr 10, 10:31 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Orleans, Saint Tammany	59 min
Apr 10, 10:42 AM CDT	Flash Flood Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist	3 hr
Apr 10, 10:50 AM CDT	Special Marine Warning	LIX		115 min
Apr 10, 10:55 AM CDT	Flash Flood Warning EmergencyCatastrophic damage threat	LIX	Jefferson, Orleans, Saint Bernard	3 hr
Apr 10, 11:03 AM CDT	Special Weather Statement	LIX	Saint James	12 min
Apr 10, 11:06 AM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Apr 10, 11:54 AM CDT	Flash Flood Warning Considerable damage threat	LIX	Jefferson, Orleans	6 hr
Apr 10, 12:00 PM CDT	Special Weather Statement	LIX	Assumption	15 min
Apr 10, 12:05 PM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa	3 hr
Apr 10, 12:12 PM CDT	Flash Flood Warning Considerable damage threat	LIX	Ascension, Livingston, Saint Charles, Saint James, Saint John the Baptist	114 min
Apr 10, 12:18 PM CDT	Special Weather Statement	LIX	Ascension, Livingston	42 min
Apr 10, 12:45 PM CDT	Flash Flood Warning EmergencyCatastrophic damage threat	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	2 hr
Apr 10, 12:48 PM CDT	Flash Flood Warning Considerable damage threat	LIX	Saint Tammany	110 min
Apr 10, 12:55 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	50 min
Apr 10, 1:32 PM CDT	Special Marine Warning	LIX		58 min
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Saint Tammany	23 hr
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Tangipahoa	23 hr
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Saint Tammany	7 hr
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Saint Tammany	9 hr
Apr 10, 2:10 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	3 hr
Apr 10, 2:50 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	55 min
Apr 10, 3:31 PM CDT	Small Craft Advisory	LIX		13 hr
Apr 9, 8:28 PM CDT	River Flood Warning	LIX	Pike, Walthall	68 hr
Apr 10, 8:30 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Amite, Wilkinson	45 min
Apr 10, 8:39 AM CDT	Special Weather Statement	LIX	Hancock	51 min
Apr 10, 9:11 AM CDT	Special Weather Statement	LIX	Harrison, Jackson, Pearl River	34 min
Apr 10, 10:27 AM CDT	Tornado Warning Tornado observed	LIX	Hancock, Harrison	33 min
Apr 10, 10:56 AM CDT	Tornado Warning	LIX	Harrison, Jackson	49 min
Apr 10, 11:13 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Jackson	47 min
Apr 10, 11:20 AM CDT	Flash Flood Warning	LIX	Hancock, Pearl River	3 hr
Apr 10, 11:29 AM CDT	Flash Flood Warning	LIX	Harrison, Jackson	6 hr
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Pearl River	53 hr
Apr 10, 1:42 PM CDT	River Flood Warning	LIX	Pearl River	55 hr
Apr 10, 3:39 PM CDT	River Flood Warning	LIX	Harrison	49 hr
Apr 10, 3:39 PM CDT	River Flood Warning	LIX	Harrison	51 hr
Apr 10, 3:39 PM CDT	River Flood Warning	LIX	Hancock	5 hr
Apr 10, 3:39 PM CDT	River Flood Warning	LIX	Harrison	56 hr

Nearby

Flash Flood Warnings in Louisiana, 2024 Every flash flood warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.