Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 43, NWS New Orleans, LA

May 20, 20215 parishes in Louisiana

NWS New Orleans, LA issued this flash flood warning at May 20, 2021, 9:29 AM CDT for 5 parishes in Louisiana. It was in force for 9 hr. 6 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 20, 2021, 9:29 AM CDT (14:29 UTC)
Expired: May 20, 2021, 6:30 PM CDT
In force: 9 hr
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

What was reported inside it

Time	Report	Where	Remark
May 20, 12:30 PM CDT	FLASH FLOOD	3 Sw Prairieville, LA	WATER IN HOMES OFF OF RIDGE RD.
May 20, 12:42 PM CDT	FLASH FLOOD	4 S Baker, LA	SEVERAL ROADS AROUND THE BATON ROUGE AIRPORT HAVE BEEN CLOSED DUE TO FLASH FLOODING .
May 20, 12:50 PM CDT	FLASH FLOOD	4 E Oak Hills Place, LA	ROAD CLOSED AT OLD PERKINS RD E & BARINGER FOREMAN RD.
May 20, 12:51 PM CDT	FLASH FLOOD	Greenwell Spring, LA	SEVERAL ROADS CLOSED THROUGHOUT GREENWELL SPRINGS.
May 20, 12:55 PM CDT	FLASH FLOOD	7 Ene Prairieville, LA	ROADS CLOSED NEAR FRENCH SETTLEMENT DUE TO HIGH WATER AND FLASH FLOODING.
May 20, 1:00 PM CDT	FLASH FLOOD	3 Nnw Prairieville, LA	SEVERAL ROADS CLOSED ALONG HWY 73 NEAR PRAIRIEVILLE DUE TO FLASH FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.5 hours before the alert went out and 129 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: 622 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

576 
WGUS54 KLIX 201429
FFWLIX
LAC005-033-047-063-121-201730-
/O.NEW.KLIX.FF.W.0043.210520T1429Z-210520T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
929 AM CDT Thu May 20 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Northern Ascension Parish in southeastern Louisiana...
  East Baton Rouge Parish in southeastern Louisiana...
  East Central Iberville Parish in southeastern Louisiana...
  Western Livingston Parish in southeastern Louisiana...
  Southeastern West Baton Rouge Parish in southeastern Louisiana...

* Until 1230 PM CDT.

* At 929 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain in Hwy 427, Alligator  Rd, Burbank. Between 0.5 and 2 
  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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 20.
	Interstate 110 in Louisiana between mile markers 1 and 8.

Additional rainfall amounts of 0.5 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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 3 HOURS 

$$

TE

5 follow-up statements

331 
WGUS74 KLIX 201519
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
1019 AM CDT Thu May 20 2021

LAC005-033-047-063-121-201730-
/O.CON.KLIX.FF.W.0043.000000T0000Z-210520T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ascension LA-East Baton Rouge LA-Iberville LA-Livingston LA-West
Baton Rouge LA-
1019 AM CDT Thu May 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT THIS 
AFTERNOON FOR NORTHERN ASCENSION, EAST BATON ROUGE, EAST CENTRAL 
IBERVILLE, WESTERN LIVINGSTON AND SOUTHEASTERN WEST BATON ROUGE 
PARISHES...

At 1019 AM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 1 and 3 inches of rain 
have fallen. Flash flooding is already occurring around the Baton 
Rouge airport and bayous and creeks are already beginning to rise in 
southeast East Baton Rouge.

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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 19.
	Interstate 110 in Louisiana between mile markers 1 and 8.

Additional rainfall amounts of 1 to 3 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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 3 HOURS 

$$

CAB

352 
WGUS54 KLIX 201717
FFWLIX
LAC005-033-047-063-121-201930-
/O.EXT.KLIX.FF.W.0043.000000T0000Z-210520T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1217 PM CDT Thu May 20 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northern Ascension Parish in southeastern Louisiana...
  East Baton Rouge Parish in southeastern Louisiana...
  East Central Iberville Parish in southeastern Louisiana...
  Western Livingston Parish in southeastern Louisiana...
  Southeastern West Baton Rouge Parish in southeastern Louisiana...

* Until 230 PM CDT.

* At 1217 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 4 inches of 
  rain have fallen. Flash flooding is already occurring.

  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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 19.
	Interstate 110 in Louisiana between mile markers 1 and 8.

Additional rainfall amounts of 1 to 3 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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 3 HOURS 

$$

CAB

097 
WGUS74 KLIX 201753
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
1253 PM CDT Thu May 20 2021

LAC005-033-047-063-121-201930-
/O.CON.KLIX.FF.W.0043.000000T0000Z-210520T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ascension LA-East Baton Rouge LA-Iberville LA-Livingston LA-West
Baton Rouge LA-
1253 PM CDT Thu May 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT THIS 
AFTERNOON FOR NORTHERN ASCENSION, EAST BATON ROUGE, EAST CENTRAL 
IBERVILLE, WESTERN LIVINGSTON AND SOUTHEASTERN WEST BATON ROUGE 
PARISHES...

At 1253 PM CDT, the public reported thunderstorms producing heavy 
rain across the warned area. Between 1.5 and 4 inches of rain have 
fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public.

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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 19.
	Interstate 110 in Louisiana between mile markers 1 and 8.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area. Seeing media reports of water entering homes along 
Ridge Rd.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...OBSERVED

$$

CAB

367 
WGUS54 KLIX 201910
FFWLIX
LAC005-033-047-063-121-202130-
/O.EXT.KLIX.FF.W.0043.000000T0000Z-210520T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
210 PM CDT Thu May 20 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northern Ascension Parish in southeastern Louisiana...
  East Baton Rouge Parish in southeastern Louisiana...
  East Central Iberville Parish in southeastern Louisiana...
  Western Livingston Parish in southeastern Louisiana...
  Southeastern West Baton Rouge Parish in southeastern Louisiana...

* Until 430 PM CDT.

* At 210 PM CDT, emergency management reported thunderstorms 
  producing heavy rain in Greenwell Springs. Between 1.5 and 4 
  inches of rain have fallen. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management.

  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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 19.
	Interstate 110 in Louisiana between mile markers 1 and 8.

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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...OBSERVED

$$

CAB

263 
WGUS54 KLIX 202120
FFWLIX
LAC005-033-047-063-121-202330-
/O.EXT.KLIX.FF.W.0043.000000T0000Z-210520T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
420 PM CDT Thu May 20 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northern Ascension Parish in southeastern Louisiana...
  East Baton Rouge Parish in southeastern Louisiana...
  East Central Iberville Parish in southeastern Louisiana...
  Western Livingston Parish in southeastern Louisiana...
  Southeastern West Baton Rouge Parish in southeastern Louisiana...

* Until 630 PM CDT.

* At 420 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain in Baton Rouge Metro. Between 10 and 20 inches of rain 
  have fallen over the last few days. Flash flooding is already 
  occurring.

  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, Zachary, Baker, Denham Springs, Gonzales, Port Allen, 
  Oak Hills Place, St. Gabriel, Walker, Sorrento, French Settlement, 
  Port Vincent, Shenandoah, Old Jefferson, Inniswold, Village St. 
  George, Westminster, Prairieville, Merrydale and Gardere.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 154 and 179.
	Interstate 12 between mile markers 1 and 19.
	Interstate 110 in Louisiana between mile markers 1 and 8.

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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 3035 9123 3049 9120 3068 9127 3068 9093
      3021 9063 3018 9076 3018 9084 3022 9107
      3022 9118

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 7:03 PM CDT	Special Weather Statement	LIX	Saint Tammany	42 min
May 19, 7:24 PM CDT	Special Marine Warning	LIX		81 min
May 19, 8:00 PM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	25 min
May 19, 8:30 PM CDT	Special Marine Warning	LIX		30 min
May 19, 9:19 PM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, Livingston	116 min
May 20, 3:42 AM CDT	Special Weather Statement	LIX	Ascension, Assumption, Iberville, Jefferson, Plaquemines, Saint Charles and 3 more	63 min
May 20, 4:05 AM CDT	Special Marine Warning	LIX		55 min
May 20, 4:18 AM CDT	Special Marine Warning	LIX		57 min
May 20, 5:03 AM CDT	Special Marine Warning	LIX		57 min
May 20, 5:33 AM CDT	Special Marine Warning	LIX		57 min
May 20, 7:00 AM CDT	Special Weather Statement	LIX	Assumption, Jefferson, Lafourche, Saint Charles, Saint James	60 min
May 20, 7:39 AM CDT	Tornado Warning	LIX	Jefferson	8 min
May 20, 7:42 AM CDT	Special Marine Warning	LIX		33 min
May 20, 8:27 AM CDT	Special Marine Warning	LIX		63 min
May 20, 8:37 AM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 3 more	52 min
May 20, 8:58 AM CDT	Tornado Warning	LIX	East Feliciana	13 min
May 20, 9:45 AM CDT	Flash Flood Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	11 hr
May 20, 10:04 AM CDT	Flash Flood Warning	LIX	Ascension, Assumption, Iberville, Lafourche, Livingston, Saint James and 1 more	13 hr
May 20, 10:52 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	19 min
May 20, 11:22 AM CDT	Special Marine Warning	LIX		38 min
May 20, 11:26 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena	94 min
May 20, 2:16 PM CDT	River Flood Warning	LIX	East Baton Rouge, Livingston	68 hr
May 20, 2:22 PM CDT	River Flood Warning	LIX	Ascension, Livingston	4 days
May 20, 2:33 PM CDT	Special Marine Warning	LIX		57 min
May 20, 2:40 PM CDT	River Flood Warning	LIX	East Baton Rouge	61 hr
May 20, 3:29 PM CDT	Special Marine Warning	LIX		61 min
May 20, 3:56 PM CDT	Gale Warning	LIX		19 hr
May 20, 3:56 PM CDT	Small Craft Advisory	LIX		60 hr
May 20, 3:56 PM CDT	Wind Advisory	LIX	Orleans, Saint Bernard, Saint John the Baptist, Saint Tammany	27 hr
May 20, 4:30 PM CDT	Special Marine Warning	LIX		90 min
May 20, 4:58 PM CDT	Special Weather Statement	LIX	Lafourche, Terrebonne	47 min
May 20, 5:16 PM CDT	Areal Flood Advisory	LIX	Assumption, Jefferson, Lafourche, Terrebonne	3 hr
May 20, 6:42 PM CDT	Flash Flood Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena, West Baton Rouge	4 hr

Nearby

Flash Flood Warnings in Louisiana, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.