Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 40, NWS Lake Charles, LA

July 3, 2021Lafayette Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jul 3, 2021, 2:50 PM CDT for Lafayette 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: Jul 3, 2021, 2:50 PM CDT (19:50 UTC)
Expired: Jul 3, 2021, 5:45 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

County Lafayette Parish, LA

The radar

The Lake Charles radar (KLCH), 119 km from the middle of the area, began a volume at 19:55 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, 7.8 hours before the alert went out and 118 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.

891 
WGUS54 KLCH 031950
FFWLCH
LAC055-032115-
/O.NEW.KLCH.FF.W.0040.210703T1950Z-210703T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  East Central Lafayette Parish in south central Louisiana...

* Until 415 PM CDT.

* At 250 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...
  Lafayette and Broussard.

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 3019 9195 3014 9193 3013 9203 3018 9207
      3021 9203 3023 9197 3021 9197 3021 9198
      3020 9198 3018 9198 3018 9197 3018 9196
      3018 9195

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR 

$$

1 follow-up statement

670 
WGUS54 KLCH 032054
FFWLCH
LAC055-032245-
/O.EXT.KLCH.FF.W.0040.000000T0000Z-210703T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Lake Charles has extended the

* Flash Flood Warning for...
  East Central Lafayette Parish in south central Louisiana...

* Until 545 PM CDT.

* At 354 PM CDT, Doppler radar indicated thunderstorms are ending 
  across the area. However Between 1 and 3 inches of rain have 
  fallen in a short period and flash flooding will likely continue 
  for another hour or so.

  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 and Broussard.

Additional rainfall amounts up to 1 inch 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 3019 9195 3014 9193 3013 9203 3018 9207
      3021 9203 3023 9197 3021 9197 3021 9198
      3020 9198 3018 9198 3018 9197 3018 9196
      3018 9195

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR 

$$

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, 3:46 PM CDT	Flash Flood Warning	LCH	Lafayette, Vermilion	119 min
Jul 3, 6:11 PM CDT	Flash Flood Warning	LCH	Lafayette, Saint Martin	4 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.