Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 64, NWS Lake Charles, LA

September 28, 2021Acadia Parish, Evangeline Parish, Saint Landry Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Sep 28, 2021, 12:26 PM CDT for Acadia Parish, Evangeline Parish, Saint Landry 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: Sep 28, 2021, 12:26 PM CDT (17:26 UTC)
Expired: Sep 28, 2021, 3:30 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

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

The radar

The Ft Polk radar (KPOE), 87 km from the middle of the area, began a volume at 17:25 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, 5.4 hours before the alert went out and 87 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: 922 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -95 m²/s²
0-3 km storm-relative helicity: -188 m²/s²
Significant tornado parameter: -0.3
Supercell composite: -3.3

Open this sounding in Storm Lab

The text

As transmitted.

400 
WGUS54 KLCH 281726
FFWLCH
LAC001-039-097-282030-
/O.NEW.KLCH.FF.W.0064.210928T1726Z-210928T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
1226 PM CDT Tue Sep 28 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Southern Evangeline Parish in central Louisiana...
  Central St. Landry Parish in central Louisiana...
  Northern Acadia Parish in southwestern Louisiana...

* Until 330 PM CDT.

* At 1226 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Opelousas, Eunice, Ville Platte, Church Point, Mamou, Basile, 
  Iota, Palmetto, Morrow, Port Barre, Washington, Chataignier, 
  Prairie Ronde, Swords, Lawtell, Savoy, Grand Prairie, Richard, 
  Reddell and Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3048 9263 3051 9262 3052 9262 3054 9260
      3056 9259 3057 9258 3059 9260 3072 9232
      3085 9209 3083 9186 3055 9192 3044 9207
      3033 9231 3031 9247 3039 9261 3041 9261
      3042 9260

FLASH FLOOD...RADAR INDICATED

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 6:29 AM CDT	Special Weather Statement	LCH	Vernon	61 min
Sep 28, 6:39 AM CDT	Flash Flood Warning	LCH	Vernon	3 hr
Sep 28, 8:41 AM CDT	Flash Flood Warning Considerable damage threat	LCH	Allen, Beauregard, Rapides, Vernon	5 hr
Sep 28, 9:15 AM CDT	Flash Flood Warning	LCH	Allen, Beauregard, Calcasieu	5 hr
Sep 28, 9:43 AM CDT	Flash Flood Warning	LCH	Iberia	2 hr
Sep 28, 10:18 AM CDT	Flash Flood Warning	LCH	Calcasieu, Cameron, Jefferson Davis	4 hr
Sep 28, 10:19 AM CDT	Special Weather Statement	LCH	Calcasieu	26 min
Sep 28, 12:41 PM CDT	River Flood Warning	LCH	Calcasieu	14 days
Sep 28, 2:11 PM CDT	River Flood Warning	LCH	Rapides	43 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.