Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 20, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Apr 16, 2021, 11:46 PM CDT for 4 parishes in 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 outline as issued.
The facts
- Issued
- Apr 16, 2021, 11:46 PM CDT (04:46 UTC)
- Expired
- Apr 17, 2021, 2:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties East Baton Rouge Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 4.8 hours before the alert went out and 121 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
- 828 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
538
WGUS54 KLIX 170446
FFWLIX
LAC033-063-091-105-170745-
/O.NEW.KLIX.FF.W.0020.210417T0446Z-210417T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1146 PM CDT Fri Apr 16 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Northeastern East Baton Rouge Parish in southeastern Louisiana...
Northern Livingston Parish in southeastern Louisiana...
Southern St. Helena Parish in southeastern Louisiana...
Central Tangipahoa Parish in southeastern Louisiana...
* Until 245 AM CDT.
* At 1146 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Baton Rouge, Hammond, Zachary, Baker, Denham Springs, Amite,
Walker, Amite City, Livingston, Independence, Albany, Montpelier,
Watson, Natalbany, Greenwell Spring, Pride, Merrydale, Robert,
Brownfields and Tickfaw.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3044 9119 3053 9119 3069 9122 3072 9091
3072 9089 3072 9088 3072 9085 3072 9084
3077 9028 3049 9026
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS
$$
TE1 follow-up statement
024
WGUS74 KLIX 170641
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
141 AM CDT Sat Apr 17 2021
LAC033-063-091-170651-
/O.CAN.KLIX.FF.W.0020.000000T0000Z-210417T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
East Baton Rouge LA-Livingston LA-St. Helena LA-
141 AM CDT Sat Apr 17 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN EAST BATON
ROUGE, NORTHERN LIVINGSTON AND SOUTHERN ST. HELENA PARISHES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flash Flood Watch remains in effect until 100 PM CDT Saturday for
portions of southeast Louisiana and southern Mississippi.
LAT...LON 3074 9057 3077 9028 3049 9026 3047 9055
3048 9056 3049 9057 3050 9057
$$
LAC105-170745-
/O.CON.KLIX.FF.W.0020.000000T0000Z-210417T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Tangipahoa LA-
141 AM CDT Sat Apr 17 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT EARLY THIS
MORNING FOR CENTRAL TANGIPAHOA PARISH...
At 141 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 4 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Hammond, Amite, Amite City, Independence, Natalbany, Robert and
Tickfaw.
Additional rainfall amounts of .5 to 1 inches are possible in the
warned area with this thunderstorm.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3074 9057 3077 9028 3049 9026 3047 9055
3048 9056 3049 9057 3050 9057
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25-1 INCH IN 1 HOUR
$$
TEThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 7:36 PM CDT | Special Weather Statement | LIX | Livingston | 54 min |
| Apr 16, 8:16 PM CDT | Special Weather Statement | LIX | Saint Tammany | 74 min |
| Apr 16, 8:19 PM CDT | Special Marine Warning | LIX | 27 min | |
| Apr 16, 9:10 PM CDT | Special Marine Warning | LIX | 38 min | |
| Apr 17, 1:11 AM CDT | Special Marine Warning | LIX | 64 min | |
| Apr 17, 2:23 AM CDT | Special Marine Warning | LIX | 22 min | |
| Apr 17, 4:05 AM CDT | Small Craft Advisory | LIX | 24 hr | |
| Apr 17, 11:57 AM CDT | Areal Flood Advisory | LIX | Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 4 more | 3 hr |
| Apr 17, 12:15 PM CDT | River Flood Warning | LIX | Livingston | 46 hr |
| Apr 17, 12:39 PM CDT | Special Weather Statement | LIX | Lafourche | 36 min |
| Apr 17, 1:25 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 3 hr |
| Apr 17, 4:55 PM CDT | Special Marine Warning | LIX | 65 min | |
| Apr 17, 5:13 PM CDT | Special Marine Warning | LIX | 62 min | |
| Apr 17, 6:14 PM CDT | Special Marine Warning | LIX | 61 min |
Nearby
Flash Flood Warnings in Louisiana, 2021Every flash flood warning in 2021
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.