Alert archive / Louisiana / Flash Flood Warnings in 2023
Flash Flood Warning 50, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Dec 1, 2023, 4:33 AM CST for 5 parishes in Louisiana. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 1, 2023, 4:33 AM CST (10:33 UTC)
- Expired
- Dec 1, 2023, 5:40 AM CST
- In force
- 67 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Ascension Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Livingston Parish, LA, West Baton Rouge Parish, LA
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.6 hours before the alert went out and 206 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 164 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Dec 1, 3:20 AM CST, 1 hour 13 minutes earlier.
Area forecast discussion, Dec 1, 3:20 AM CST, 1 hour 13 minutes before
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</html>In the hours before
Special weather statement, Dec 1, 4:08 AM CST, 25 minutes before
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, Dec 1, 4:09 AM CST, 24 minutes before
Special 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, Dec 1, 4:22 AM CST, 11 minutes before
Special 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 office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 1, 1:17 AM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge | 29 min |
| Dec 1, 4:08 AM CST | Special Weather Statement | LIX | Livingston | 37 min |
| Dec 1, 4:09 AM CST | Special Weather Statement | LIX | Ascension | 36 min |
| Dec 1, 4:18 AM CST | Special Marine Warning | LIX | 57 min | |
| Dec 1, 4:22 AM CST | Special Weather Statement | LIX | Ascension, Saint James | 38 min |
| Dec 1, 4:29 AM CST | Areal Flood Advisory | LIX | Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge | 4 min |
| Dec 1, 7:01 AM CST | Special Marine Warning | LIX | 59 min | |
| Dec 1, 8:04 AM CST | Special Marine Warning | LIX | 56 min | |
| Dec 1, 1:36 PM CST | Flood Watch | LIX | Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Livingston and 8 more | 16 hr |
| Dec 1, 6:14 AM CST | Special Weather Statement | LIX | Hancock | 46 min |
| Dec 1, 6:59 AM CST | Special Weather Statement | LIX | Harrison | 61 min |
| Dec 1, 8:02 AM CST | Special Weather Statement | LIX | Jackson | 28 min |
Nearby
Flash Flood Warnings in Louisiana, 2023Every flash flood warning in 2023
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.