Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS New Orleans, LA

May 10, 2021Jefferson Parish, Orleans Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 10, 2021, 2:57 AM CDT for Jefferson Parish, Orleans Parish, Saint Charles Parish, Louisiana. It was in force for 9 hr. 2 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 10, 2021, 2:57 AM CDT (07:57 UTC)
Expired: May 10, 2021, 12:00 PM CDT
In force: 9 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Jefferson Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA

What was reported inside it

Time	Report	Where	Remark
May 10, 3:20 AM CDT	FLASH FLOOD	New Orleans, LA	SEVERAL UNDERPASSES CLOSED DUE TO FLOODING IN THE CITY OF NEW ORLEANS AFTER 1.5 INCHES OF RAIN IN 30 MINUTES.
May 10, 3:54 AM CDT	FLASH FLOOD	Metairie, LA	NUMEROUS STREETS FLOODED IN THE METAIRIE AREA, WITH SEVERAL VEHICLES STALLED.

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 00:00Z, 8.0 hours before the alert went out and 61 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: 186 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1292 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

061 
WGUS54 KLIX 100757
FFWLIX
LAC051-071-089-101000-
/O.NEW.KLIX.FF.W.0025.210510T0757Z-210510T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
257 AM CDT Mon May 10 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...
  Southwestern Orleans Parish in southeastern Louisiana...
  Northern St. Charles Parish in southeastern Louisiana...

* Until 500 AM CDT.

* At 257 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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...
  New Orleans, Avondale, Metairie, Marrero, Hahnville, Harvey, 
  Timberlane, Laplace, Jefferson, Gretna, Harahan, Westwego, 
  Waggaman, River Ridge, Ama, St. Rose, Elmwood, Bridge City, Luling 
  and Destrehan.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 215 and 243.
	Interstate 610 between mile markers 1 and 4.
	Interstate 310 between mile markers 1 and 10.

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 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 2 HOURS 

$$

TE

5 follow-up statements

085 
WGUS54 KLIX 100940
FFWLIX
LAC051-071-089-101300-
/O.EXT.KLIX.FF.W.0025.000000T0000Z-210510T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
440 AM CDT Mon May 10 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...
  Southwestern Orleans Parish in southeastern Louisiana...
  Northern St. Charles Parish in southeastern Louisiana...

* Until 800 AM CDT.

* At 440 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.

  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...
  New Orleans, Avondale, Metairie, Marrero, Hahnville, Harvey, 
  Timberlane, Laplace, Jefferson, Gretna, Harahan, Westwego, 
  Waggaman, River Ridge, Ama, St. Rose, Elmwood, Bridge City, Luling 
  and Destrehan.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 215 and 243.
	Interstate 610 between mile markers 1 and 4.
	Interstate 310 between mile markers 1 and 10.

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.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 3 HOURS 

$$

TE

641 
WGUS74 KLIX 100950
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
450 AM CDT Mon May 10 2021

LAC051-071-089-101300-
/O.CON.KLIX.FF.W.0025.000000T0000Z-210510T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson LA-Orleans LA-St. Charles LA-
450 AM CDT Mon May 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING 
FOR NORTHWESTERN JEFFERSON, SOUTHWESTERN ORLEANS AND NORTHERN ST. 
CHARLES PARISHES...

At 450 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.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  New Orleans, Avondale, Metairie, Marrero, Hahnville, Harvey, 
  Timberlane, Laplace, Jefferson, Gretna, Harahan, Westwego, 
  Waggaman, River Ridge, Ama, St. Rose, Elmwood, Bridge City, Luling 
  and Destrehan.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 215 and 243.
	Interstate 610 between mile markers 1 and 4.
	Interstate 310 between mile markers 1 and 10.

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.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 3 HOURS 

$$

TE

035 
WGUS54 KLIX 101237
FFWLIX
LAC051-071-089-101500-
/O.EXT.KLIX.FF.W.0025.000000T0000Z-210510T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
737 AM CDT Mon May 10 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...
  Southwestern Orleans Parish in southeastern Louisiana...
  Northern St. Charles Parish in southeastern Louisiana...

* Until 1000 AM CDT.

* At 737 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. Flash flooding is ongoing.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  New Orleans, Avondale, Metairie, Marrero, Hahnville, Harvey, 
  Timberlane, Laplace, Jefferson, Gretna, Harahan, Westwego, 
  Waggaman, River Ridge, Ama, St. Rose, Elmwood, Bridge City, Luling 
  and Destrehan.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 215 and 243.
	Interstate 610 between mile markers 1 and 4.
	Interstate 310 between mile markers 1 and 10.

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.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

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

$$

TE

215 
WGUS54 KLIX 101452
FFWLIX
LAC051-071-089-101700-
/O.EXT.KLIX.FF.W.0025.000000T0000Z-210510T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
952 AM CDT Mon May 10 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...
  Southwestern Orleans Parish in southeastern Louisiana...
  Northern St. Charles Parish in southeastern Louisiana...

* Until noon CDT.

* At 952 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 6 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  New Orleans, Avondale, Metairie, Marrero, Hahnville, Harvey, 
  Timberlane, Laplace, Jefferson, Gretna, Harahan, Westwego, 
  Waggaman, River Ridge, Ama, St. Rose, Elmwood, Bridge City, Luling 
  and Destrehan.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 215 and 243.
	Interstate 610 between mile markers 1 and 4.
	Interstate 310 between mile markers 1 and 10.

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.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

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

$$

609 
WGUS74 KLIX 101659
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
1159 AM CDT Mon May 10 2021

LAC051-071-089-101709-
/O.EXP.KLIX.FF.W.0025.000000T0000Z-210510T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson LA-Orleans LA-St. Charles LA-
1159 AM CDT Mon May 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT NOON CDT TODAY FOR 
NORTHWESTERN JEFFERSON, SOUTHWESTERN ORLEANS AND NORTHERN ST. 
CHARLES PARISHES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 2993 9054 2994 9054 3008 9041 3006 9038
      3006 9031 3004 9028 3005 9028 3005 9026
      3002 9016 3003 9003 3004 9003 3004 8999
      2983 9007

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 8:48 PM CDT	Flash Flood Watch	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	15 hr
May 10, 1:00 AM CDT	Special Weather Statement	LIX	Ascension, Livingston	60 min
May 10, 1:29 AM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, Iberville, Saint James	70 min
May 10, 1:49 AM CDT	Special Weather Statement	LIX	Assumption, Saint James, Saint John the Baptist	56 min
May 10, 1:54 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Saint James	51 min
May 10, 2:01 AM CDT	Special Marine Warning	LIX		59 min
May 10, 2:43 AM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	2 hr
May 10, 2:52 AM CDT	Special Marine Warning	LIX		53 min
May 10, 3:25 AM CDT	Special Weather Statement	LIX	Orleans	35 min
May 10, 3:37 AM CDT	Special Marine Warning	LIX		113 min
May 10, 3:41 AM CDT	Tornado Warning	LIX	Orleans, Plaquemines, Saint Bernard	18 min
May 10, 4:20 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	115 min
May 10, 5:26 AM CDT	Special Marine Warning	LIX		64 min
May 10, 5:29 AM CDT	Special Marine Warning	LIX		2 hr
May 10, 5:38 AM CDT	Special Weather Statement	LIX	West Baton Rouge	67 min
May 10, 6:04 AM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	56 min
May 10, 6:16 AM CDT	Special Weather Statement	LIX	Saint Charles	44 min
May 10, 6:36 AM CDT	Special Marine Warning	LIX		54 min
May 10, 7:25 AM CDT	Special Weather Statement	LIX	Saint John the Baptist	50 min
May 10, 7:34 AM CDT	Special Marine Warning	LIX		56 min
May 10, 7:51 AM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	54 min
May 10, 8:23 AM CDT	Special Marine Warning	LIX		67 min
May 10, 8:28 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge	62 min
May 10, 9:16 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 2 more	44 min
May 10, 9:38 AM CDT	Tornado Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	20 min
May 10, 9:57 AM CDT	Special Weather Statement	LIX	Assumption, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany	63 min
May 10, 10:29 AM CDT	Special Marine Warning	LIX		61 min
May 10, 11:08 AM CDT	Special Weather Statement	LIX	Orleans	52 min
May 10, 11:17 AM CDT	Special Marine Warning	LIX		58 min
May 10, 12:10 PM CDT	Special Marine Warning	LIX		65 min
May 10, 12:14 PM CDT	Special Marine Warning	LIX		91 min
May 10, 1:08 PM CDT	Special Marine Warning	LIX		67 min
May 10, 1:44 PM CDT	Special Marine Warning	LIX		28 min
May 10, 2:09 PM CDT	Special Marine Warning	LIX		66 min
May 10, 3:09 PM CDT	Special Marine Warning	LIX		96 min

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.