Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Lake Charles, LA

May 17, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at May 17, 2021, 8:23 PM CDT for 4 parishes in Louisiana. It was in force for 3 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 17, 2021, 8:23 PM CDT (01:23 UTC)
Expired: May 17, 2021, 11:30 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Iberia Parish, LA, Lafayette Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 125 km from the middle of the area, began a volume at 01:22 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 00:00Z, 1.4 hours before the alert went out and 123 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: 114 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 1016 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -80 m²/s²
0-3 km storm-relative helicity: -51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

413 
WGUS54 KLCH 180123
FFWLCH
LAC045-055-099-113-180430-
/O.NEW.KLCH.FF.W.0028.210518T0123Z-210518T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
823 PM CDT Mon May 17 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Northwestern Iberia Parish in south central Louisiana...
  Southeastern Lafayette Parish in south central Louisiana...
  Northwestern St. Martin Parish in south central Louisiana...
  Eastern Vermilion Parish in southwestern Louisiana...

* Until 1130 PM CDT.

* At 823 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 7 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...
  Abbeville, Breaux Bridge, St. Martinville, Broussard, Youngsville, 
  Henderson, Cade, Coteau, Acadiana Regional Airport, Jefferson 
  Island and Parks.

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.

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 3013 9193 3019 9196 3027 9189 3033 9176
      3011 9178 3003 9186 2997 9193 2998 9211
      3006 9205

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

$$

Brazzell

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 7:01 PM CDT	Flash Flood Warning	LCH	Lafayette	5 hr
May 17, 7:18 PM CDT	Tornado Warning	LCH	Iberia, Lafayette, Saint Martin	27 min
May 17, 7:19 PM CDT	Tornado Warning	LCH	Lafayette, Vermilion	26 min
May 17, 7:20 PM CDT	Flash Flood Warning	LCH	Vermilion	3 hr
May 17, 7:35 PM CDT	Areal Flood Warning	LCH	Acadia, Allen, Calcasieu, Evangeline, Jefferson Davis	6 hr
May 17, 7:40 PM CDT	Special Marine Warning	LCH		65 min
May 17, 7:46 PM CDT	Tornado Warning	LCH	Iberia, Vermilion	29 min
May 17, 8:22 PM CDT	Special Weather Statement	LCH	Saint Martin	38 min
May 17, 8:33 PM CDT	River Flood Warning	LCH	Lafayette, Saint Landry, Saint Martin	8 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Beauregard, Vernon	8 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Calcasieu	12 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Acadia, Evangeline, Saint Landry	5 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Allen, Rapides	21 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Acadia, Allen, Evangeline, Jefferson Davis	8 days
May 17, 8:33 PM CDT	Special Marine Warning	LCH		87 min
May 17, 8:53 PM CDT	Special Weather Statement	LCH	Saint Martin, St. Mary	52 min
May 17, 9:49 PM CDT	Special Weather Statement	LCH	Iberia, St. Mary	56 min
May 17, 9:54 PM CDT	Special Marine Warning	LCH		96 min
May 17, 11:08 PM CDT	Areal Flood Warning	LCH	Vermilion	3 hr
May 17, 11:44 PM CDT	Areal Flood Warning	LCH	Iberia, Lafayette, Saint Martin, Vermilion	3 hr
May 18, 12:24 AM CDT	Special Marine Warning	LCH		66 min
May 18, 1:40 AM CDT	Areal Flood Warning	LCH	Acadia, Calcasieu, Jefferson Davis	5 hr
May 18, 1:48 AM CDT	Small Craft Advisory	LCH		5 days
May 18, 2:25 AM CDT	Areal Flood Warning	LCH	Iberia, Lafayette, Saint Landry, Saint Martin, Vermilion	6 hr
May 18, 2:25 AM CDT	Special Marine Warning	LCH		50 min
May 18, 7:00 AM CDT	Areal Flood Warning	LCH	Calcasieu, Jefferson Davis	3 hr
May 18, 7:54 AM CDT	Areal Flood Warning	LCH	Iberia, Lafayette, Saint Martin, Vermilion	2 hr
May 18, 9:47 AM CDT	Special Marine Warning	LCH		58 min
May 18, 11:06 AM CDT	River Flood Warning	LCH	Allen, Beauregard	21 days
May 18, 11:56 AM CDT	River Flood Warning	LCH	Calcasieu	10 days
May 18, 1:25 PM CDT	Special Marine Warning	LCH		65 min
May 18, 1:42 PM CDT	Coastal Flood Advisory	LCH	Cameron	8 hr
May 18, 1:57 PM CDT	Wind Advisory	LCH	Cameron, Saint Martin	14 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.