Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 58, NWS Lake Charles, LA

September 28, 2021Vernon Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Sep 28, 2021, 6:39 AM CDT for Vernon Parish, Louisiana. It was in force for 3 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: Sep 28, 2021, 6:39 AM CDT (11:39 UTC)
Expired: Sep 28, 2021, 10:00 AM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

County Vernon Parish, LA

The radar

The Ft Polk radar (KPOE), 22 km from the middle of the area, began a volume at 11:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Sep 28, 7:37 AM CDT	FLASH FLOOD	2 Nnw Fullerton, LA	REPORT OF EQUIPMENT STARTING TO FLOOD WITHIN A PORTION OF THE FT. POLK BASE.
Sep 28, 8:32 AM CDT	FLASH FLOOD	1 W Fort Polk, LA	FLOODING REPORTED IN SEVERAL LOCATIONS ON FORT POLK.

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

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.7 hours before the alert went out and 103 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: 2524 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

604 
WGUS54 KLCH 281139
FFWLCH
LAC115-281500-
/O.NEW.KLCH.FF.W.0058.210928T1139Z-210928T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
639 AM CDT Tue Sep 28 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Central Vernon Parish in west central Louisiana...

* Until 1000 AM CDT.

* At 639 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 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...
  Leesville, Fort Polk, New Llano, Cravens, Fullerton, Lacamp and 
  Pickering.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3116 9329 3118 9319 3118 9295 3116 9290
      3113 9288 3107 9288 3102 9290 3098 9294
      3096 9298 3095 9311 3095 9322 3092 9339
      3092 9345 3095 9348 3102 9347 3107 9344

FLASH FLOOD...RADAR INDICATED

$$

Landreneau

2 follow-up statements

253 
WGUS74 KLCH 281230
FFSLCH

Flash Flood Statement
National Weather Service Lake Charles LA
730 AM CDT Tue Sep 28 2021

LAC115-281500-
/O.CON.KLCH.FF.W.0058.000000T0000Z-210928T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Vernon LA-
730 AM CDT Tue Sep 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 AM CDT THIS 
MORNING FOR CENTRAL VERNON PARISH...

At 730 AM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 3 
and 5 inches of rain have fallen. Additional rainfall amounts of 2 
to 3 inches are possible in the warned area. Flash flooding is 
ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

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...
  Leesville, Fort Polk, New Llano, Cravens, Fullerton, Lacamp and 
  Pickering.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3116 9329 3118 9319 3118 9295 3116 9290
      3113 9288 3107 9288 3102 9290 3098 9294
      3096 9298 3095 9311 3095 9322 3092 9339
      3092 9345 3095 9348 3102 9347 3107 9344

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Landreneau

212 
WGUS74 KLCH 281251
FFSLCH

Flash Flood Statement
National Weather Service Lake Charles LA
751 AM CDT Tue Sep 28 2021

LAC115-281500-
/O.CON.KLCH.FF.W.0058.000000T0000Z-210928T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Vernon LA-
751 AM CDT Tue Sep 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 AM CDT THIS 
MORNING FOR CENTRAL VERNON PARISH...

At 751 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain. Between 3 and 5 inches of rain have fallen. Additional 
rainfall amounts of 2 to 3 inches are possible in the warned area. 
Flash flooding is already occurring, with reports of flooding across 
portions of the Fort Polk base.

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

SOURCE...Radar.

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

Some locations that will experience flash flooding include...
  Leesville, Fort Polk, New Llano, Cravens, Fullerton, Lacamp and 
  Pickering.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3116 9329 3118 9319 3118 9295 3116 9290
      3113 9288 3107 9288 3102 9290 3098 9294
      3096 9298 3095 9311 3095 9322 3092 9339
      3092 9345 3095 9348 3102 9347 3107 9344

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Landreneau

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 28, 6:29 AM CDT	Special Weather Statement	LCH	Vernon	61 min
Sep 28, 8:41 AM CDT	Flash Flood Warning Considerable damage threat	LCH	Allen, Beauregard, Rapides, Vernon	5 hr
Sep 28, 9:15 AM CDT	Flash Flood Warning	LCH	Allen, Beauregard, Calcasieu	5 hr
Sep 28, 9:43 AM CDT	Flash Flood Warning	LCH	Iberia	2 hr
Sep 28, 10:18 AM CDT	Flash Flood Warning	LCH	Calcasieu, Cameron, Jefferson Davis	4 hr
Sep 28, 10:19 AM CDT	Special Weather Statement	LCH	Calcasieu	26 min
Sep 28, 12:26 PM CDT	Flash Flood Warning	LCH	Acadia, Evangeline, Saint Landry	3 hr
Sep 28, 12:41 PM CDT	River Flood Warning	LCH	Calcasieu	14 days
Sep 28, 2:11 PM CDT	River Flood Warning	LCH	Rapides	43 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; radar from the NEXRAD Level II archive.