Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 45, NWS Lake Charles, LA

July 3, 2021Lafayette Parish, Saint Martin Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jul 3, 2021, 6:11 PM CDT for Lafayette Parish, Saint Martin Parish, Louisiana. It was in force for 4 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: Jul 3, 2021, 6:11 PM CDT (23:11 UTC)
Expired: Jul 3, 2021, 10:15 PM CDT
In force: 4 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Lafayette Parish, LA, Saint Martin Parish, LA

The radar

The Lake Charles radar (KLCH), 118 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 116 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: 1107 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

433 
WGUS54 KLCH 032311
FFWLCH
LAC055-099-040315-
/O.NEW.KLCH.FF.W.0045.210703T2311Z-210704T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
611 PM CDT Sat Jul 3 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Lafayette Parish in south central Louisiana...
  Northwestern St. Martin Parish in south central Louisiana...

* Until 1015 PM CDT.

* At 611 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 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...
  Lafayette, Scott, Breaux Bridge, Carencro, St. Martinville, 
  Broussard, Youngsville, Henderson, Cade, Cecilia and Parks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3029 9213 3034 9205 3035 9195 3037 9181
      3010 9179 3007 9195 3007 9200 3026 9217

FLASH FLOOD...RADAR INDICATED

$$

Tingler

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 7:01 PM CDT	Special Weather Statement	LCH	Cameron	44 min
Jul 2, 7:30 PM CDT	Special Weather Statement	LCH	Cameron	45 min
Jul 3, 2:50 PM CDT	Flash Flood Warning	LCH	Lafayette	3 hr
Jul 3, 3:46 PM CDT	Flash Flood Warning	LCH	Lafayette, Vermilion	119 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.