Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Lake Charles, LA

May 29, 2021Calcasieu Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at May 29, 2021, 12:36 PM CDT for Calcasieu Parish, 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 29, 2021, 12:36 PM CDT (17:36 UTC)
Expired: May 29, 2021, 3:45 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

County Calcasieu Parish, LA

The radar

The Lake Charles radar (KLCH), 6 km from the middle of the area, began a volume at 17:40 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, 5.6 hours before the alert went out and 6 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: 1233 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

820 
WGUS54 KLCH 291736
FFWLCH
LAC019-292045-
/O.NEW.KLCH.FF.W.0033.210529T1736Z-210529T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
1236 PM CDT Sat May 29 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Southeastern Calcasieu Parish in southwestern Louisiana...

* Until 345 PM CDT.

* At 1236 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...
  Lake Charles, Sulphur, Westlake, Moss Bluff, Holmwood and Carlyss.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3014 9336 3029 9331 3024 9307 3012 9297
      3012 9315

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
May 29, 1:41 PM CDT	Special Weather Statement	LCH	Cameron	34 min
May 29, 1:44 PM CDT	Special Weather Statement	LCH	Vermilion	31 min
May 29, 2:15 PM CDT	Special Weather Statement	LCH	Vermilion	30 min
May 29, 3:18 PM CDT	Special Weather Statement	LCH	Calcasieu	27 min
May 29, 3:21 PM CDT	Special Weather Statement	LCH	Beauregard	24 min
May 29, 3:27 PM CDT	Severe Thunderstorm Warning	LCH	Beauregard	18 min
May 29, 3:36 PM CDT	Special Weather Statement	LCH	Beauregard	24 min
May 29, 3:47 PM CDT	Special Weather Statement	LCH	Cameron	28 min
May 29, 3:55 PM CDT	Special Weather Statement	LCH	Allen	35 min
May 29, 4:06 PM CDT	Special Weather Statement	LCH	Allen	24 min
May 29, 4:23 PM CDT	Severe Thunderstorm Warning	LCH	Allen, Evangeline	18 min
May 29, 4:24 PM CDT	Special Weather Statement	LCH	Cameron	51 min
May 29, 5:53 PM CDT	Special Marine Warning	LCH		55 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.