Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 38, NWS Lake Charles, LA

June 22, 20216 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jun 22, 2021, 7:39 AM CDT for 6 parishes in Louisiana. It was in force for 2 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 22, 2021, 7:39 AM CDT (12:39 UTC)
Expired: Jun 22, 2021, 9:45 AM CDT
In force: 2 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Saint Landry Parish, LA

The radar

The Lake Charles radar (KLCH), 76 km from the middle of the area, began a volume at 12:39 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

Shreveport, LA (KSHV), launched 12:00Z, 0.7 hours before the alert went out and 242 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1238 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

998 
WGUS54 KLCH 221239
FFWLCH
LAC001-003-011-039-053-097-221445-
/O.NEW.KLCH.FF.W.0038.210622T1239Z-210622T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
739 AM CDT Tue Jun 22 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Northeastern Jefferson Davis Parish in southwestern Louisiana...
  Southwestern Evangeline Parish in central Louisiana...
  East central Beauregard Parish in southwestern Louisiana...
  Northwestern Acadia Parish in southwestern Louisiana...
  West central St. Landry Parish in central Louisiana...
  Central Allen Parish in southwestern Louisiana...

* Until 945 AM CDT.

* At 738 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Two to three inches of rain has 
  already fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  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 flooding include...
  Eunice, Mamou, Basile, Oberlin, Elton, Mittie, Grant, Allen Parish
  Airport, Harmony, Reddell, Bond and Duralde.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3066 9231 3053 9236 3045 9239 3039 9243
      3043 9261 3045 9268 3046 9274 3059 9304
      3083 9301

FLASH FLOOD...RADAR INDICATED

$$

K. Kuyper

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 7:14 PM CDT	Special Weather Statement	LCH	Evangeline	31 min
Jun 21, 7:17 PM CDT	Flash Flood Warning	LCH	Allen, Evangeline	3 hr
Jun 21, 7:59 PM CDT	Special Weather Statement	LCH	Avoyelles	46 min
Jun 22, 6:57 AM CDT	Special Weather Statement	LCH	Allen, Jefferson Davis	33 min
Jun 22, 10:34 AM CDT	Special Weather Statement	LCH	Vermilion	41 min
Jun 22, 12:28 PM CDT	Special Weather Statement	LCH	St. Mary	47 min
Jun 22, 3:15 PM CDT	Flash Flood Warning	LCH	Calcasieu	3 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.