Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 36, NWS Lake Charles, LA

June 21, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jun 21, 2021, 6:23 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: Jun 21, 2021, 6:23 PM CDT (23:23 UTC)
Expired: Jun 21, 2021, 9:30 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Acadia Parish, LA, Allen Parish, LA, Evangeline Parish, LA, Saint Landry Parish, LA

The radar

The Lake Charles radar (KLCH), 79 km from the middle of the area, began a volume at 23:26 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, 11.4 hours before the alert went out and 78 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: 2694 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 647 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

619 
WGUS54 KLCH 212323
FFWLCH
LAC001-003-039-097-220230-
/O.NEW.KLCH.FF.W.0036.210621T2323Z-210622T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
623 PM CDT Mon Jun 21 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Southwestern Evangeline Parish in central Louisiana...
  West Central St. Landry Parish in central Louisiana...
  North Central Acadia Parish in southwestern Louisiana...
  Southeastern Allen Parish in southwestern Louisiana...

* Until 930 PM CDT.

* At 623 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 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...
  Eunice, Basile, Duralde and Savoy.

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.

&&

LAT...LON 3049 9266 3050 9270 3057 9271 3061 9260
      3061 9248 3060 9244 3054 9229 3048 9229
      3047 9229 3046 9235 3045 9242 3048 9262
      3048 9263 3049 9263 3049 9264

FLASH FLOOD...RADAR INDICATED

$$

Jones

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 10:02 AM CDT	Special Weather Statement	LCH	Calcasieu	43 min
Jun 21, 10:04 AM CDT	Special Marine Warning	LCH		56 min
Jun 21, 10:35 AM CDT	Special Weather Statement	LCH	Acadia, Evangeline, Saint Landry	40 min
Jun 21, 10:44 AM CDT	Special Marine Warning	LCH		46 min
Jun 21, 12:48 PM CDT	Special Weather Statement	LCH	Allen	42 min
Jun 21, 1:23 PM CDT	Special Marine Warning	LCH		37 min
Jun 21, 2:08 PM CDT	Special Marine Warning	LCH		45 min
Jun 21, 2:29 PM CDT	Special Weather Statement	LCH	Vernon	46 min
Jun 21, 3:45 PM CDT	Special Weather Statement	LCH	Lafayette, Saint Martin	45 min
Jun 21, 6:44 PM CDT	Special Weather Statement	LCH	Rapides	76 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.