Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 67, NWS New Orleans, LA

July 3, 2021Jefferson Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 3, 2021, 3:02 PM CDT for Jefferson Parish, Louisiana. It was in force for 3 hr. 1 report 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: Jul 3, 2021, 3:02 PM CDT (20:02 UTC)
Expired: Jul 3, 2021, 5:33 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Jefferson Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jul 3, 4:45 PM CDT	FLASH FLOOD	1 Ne Kenner, LA	REPORT OF SCATTERED ROAD BARRIERS/ROAD CLOSINGS THROUGHOUT THE CITY OF KENNER FROM 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, 8.0 hours before the alert went out and 57 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: 1029 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: -48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

517 
WGUS54 KLIX 032002
FFWLIX
LAC051-032315-
/O.NEW.KLIX.FF.W.0067.210703T2002Z-210703T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
302 PM CDT Sat Jul 3 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...

* Until 615 PM CDT.

* At 302 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Metairie, Avondale, Jefferson, Harahan, River Ridge, Elmwood, 
  Waggaman, Bridge City, Ama, St. Rose and New Orleans Armstrong 
  Airport.

This includes the following Interstates...
	Interstate 10 in Louisiana between mile markers 222 and 228.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3002 9016 2993 9015 2994 9027 2997 9028
      3005 9028 3005 9026 3004 9025 3004 9024
      3003 9021 3002 9018

FLASH FLOOD...RADAR INDICATED

$$

MW

1 follow-up statement

607 
WGUS74 KLIX 032233
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
533 PM CDT Sat Jul 3 2021

LAC051-032243-
/O.CAN.KLIX.FF.W.0067.000000T0000Z-210703T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson LA-
533 PM CDT Sat Jul 3 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN JEFFERSON 
PARISH...

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

LAT...LON 3002 9016 2993 9015 2994 9027 2997 9028
      3005 9028 3005 9026 3004 9025 3004 9024
      3003 9021 3002 9018

$$

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 7:15 PM CDT	Flash Flood Warning	LIX	Ascension, East Baton Rouge	3 hr
Jul 2, 7:48 PM CDT	Special Marine Warning	LIX		57 min
Jul 2, 7:56 PM CDT	Special Weather Statement	LIX	Saint Charles, Saint John the Baptist	34 min
Jul 2, 8:14 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge	61 min
Jul 2, 8:56 PM CDT	Special Marine Warning	LIX		64 min
Jul 2, 9:52 PM CDT	Special Marine Warning	LIX		38 min
Jul 3, 1:23 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	3 hr
Jul 3, 1:31 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	111 min
Jul 3, 1:48 PM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, Livingston	44 min
Jul 3, 2:25 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans	3 hr
Jul 3, 4:39 PM CDT	Special Weather Statement	LIX	East Baton Rouge	36 min
Jul 3, 4:58 PM CDT	Special Weather Statement	LIX	East Baton Rouge	32 min
Jul 3, 5:10 PM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	3 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.