Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 30, NWS Lake Charles, LA

May 20, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at May 20, 2021, 4:04 PM CDT for 4 parishes in Louisiana. It was in force for 5 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: May 20, 2021, 4:04 PM CDT (21:04 UTC)
Expired: May 20, 2021, 9:15 PM CDT
In force: 5 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Acadia Parish, LA, Allen Parish, LA, Jefferson Davis Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 41 km from the middle of the area, began a volume at 21:05 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.1 hours before the alert went out and 40 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: 138 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

257 
WGUS54 KLCH 202104
FFWLCH
LAC001-003-053-113-210015-
/O.NEW.KLCH.FF.W.0030.210520T2104Z-210521T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
404 PM CDT Thu May 20 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Southwestern Acadia Parish in southwestern Louisiana...
  South Central Allen Parish in southwestern Louisiana...
  Jefferson Davis Parish in southwestern Louisiana...
  Northwestern Vermilion Parish in southwestern Louisiana...

* Until 715 PM CDT.

* At 404 PM 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...
  Jennings, Kaplan, Welsh, Lake Arthur, Kinder, Gueydan, Elton, 
  Mermentau, Fenton, Evangeline, Morse, Pine Island, Thornwell, 
  Egan, Riceville, Buller, Lyons Point, Wright, Estherwood and 
  Roanoke.

This includes the following highways...
	Interstate 10 in Louisiana between mile markers 45 and 76.

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.

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 3046 9306 3049 9294 3050 9277 3048 9266
      3043 9258 3021 9245 3002 9226 2999 9259
      3000 9262 3004 9262 3004 9274 3008 9289
      3011 9291 3016 9289 3016 9296 3026 9300
      3026 9301 3030 9303 3038 9303 3038 9306

FLASH FLOOD...RADAR INDICATED

$$

Brazzell

1 follow-up statement

414 
WGUS54 KLCH 210007
FFWLCH
LAC001-003-053-113-210215-
/O.EXT.KLCH.FF.W.0030.000000T0000Z-210521T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
707 PM CDT Thu May 20 2021

The National Weather Service in Lake Charles has extended the

* Flash Flood Warning for...
  Southwestern Acadia Parish in southwestern Louisiana...
  South Central Allen Parish in southwestern Louisiana...
  Jefferson Davis Parish in southwestern Louisiana...
  Northwestern Vermilion Parish in southwestern Louisiana...

* Until 915 PM CDT.

* At 707 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  Jennings, Kaplan, Welsh, Lake Arthur, Kinder, Gueydan, Elton, 
  Mermentau, Fenton, Evangeline, Morse, Pine Island, Thornwell, 
  Egan, Riceville, Buller, Lyons Point, Wright, Estherwood and 
  Roanoke.

This includes the following highways...
	Interstate 10 in Louisiana between mile markers 45 and 76.

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 3046 9306 3049 9294 3050 9277 3048 9266
      3043 9258 3021 9245 3002 9226 2999 9259
      3000 9262 3004 9262 3004 9274 3008 9289
      3011 9291 3016 9289 3016 9296 3026 9300
      3026 9301 3030 9303 3038 9303 3038 9306

FLASH FLOOD...RADAR INDICATED

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 10:00 PM CDT	Flash Flood Warning	LCH	Cameron	3 hr
May 19, 10:27 PM CDT	Special Marine Warning	LCH		33 min
May 19, 10:29 PM CDT	Special Marine Warning	LCH		31 min
May 19, 10:54 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	36 min
May 19, 10:56 PM CDT	Special Marine Warning	LCH		34 min
May 19, 11:29 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	17 min
May 20, 3:55 AM CDT	Coastal Flood Advisory	LCH	Cameron	18 hr
May 20, 9:27 AM CDT	River Flood Warning	LCH	Calcasieu, Cameron	21 days
May 20, 5:16 PM CDT	Flash Flood Warning	LCH	Beauregard, Calcasieu, Cameron, Jefferson Davis	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.