Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 56, NWS Lake Charles, LA

September 15, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at Sep 15, 2021, 1:45 AM CDT for 4 parishes in Louisiana. It was in force for 4 hr. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 15, 2021, 1:45 AM CDT (06:45 UTC)
Expired: Sep 15, 2021, 6:00 AM CDT
In force: 4 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Avoyelles Parish, LA, Evangeline Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA

The radar

The Ft Polk radar (KPOE), 69 km from the middle of the area, began a volume at 06:46 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.

What was reported inside it

Time	Report	Where	Remark
Sep 15, 2:29 AM CDT	HEAVY RAIN 3.96	3 Ese Ville Platte, LA	PERSONAL WEATHER STATION HAS MEASURED 3.96 INCHES IN THE LAST 3 HOURS.
Sep 15, 2:29 AM CDT	HEAVY RAIN 6.58	5 N Indian Lake, LA	PERSONAL WEATHER STATION HAS MEASURED 6.58 INCHES IN THE LAST 3 HOURS.
Sep 15, 2:40 AM CDT	HEAVY RAIN 4.05	5 Wsw Moreauville, LA	PERSONAL WEATHER STATION HAS MEASURED 4.05 INCHES IN THE LAST 3 HOURS.
Sep 15, 5:10 AM CDT	HEAVY RAIN 5.81	3 Ese Ville Platte, LA	PERSONAL WEATHER STATION MEASURED 5.81 INCHES IN THE PAST 6 HOURS.
Sep 15, 5:10 AM CDT	HEAVY RAIN 6.67	5 Wsw Moreauville, LA	PERSONAL WEATHER STATION MEASURE 6.67 INCHES IN THE PAST 6 HOURS.
Sep 15, 5:10 AM CDT	HEAVY RAIN 7.76	5 N Indian Lake, LA	PERSONAL WEATHER STATION MEASURED 7.76 INCHES IN THE LAST 6 HOURS.
Sep 15, 5:34 AM CDT	FLASH FLOOD	4 Ese Ville Platte, LA	ALL LANES ON US167 FROM LA748 TO THE EVANGELINE ST. LANDRY PARISH LINE HAS BEEN CLOSED DUE TO HIGH WATER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.8 hours before the alert went out and 113 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: 254 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

017 
WGUS54 KLCH 150645
FFWLCH
LAC009-039-079-097-151100-
/O.NEW.KLCH.FF.W.0056.210915T0645Z-210915T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
145 AM CDT Wed Sep 15 2021

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Southwestern Avoyelles Parish in central Louisiana...
  Evangeline Parish in central Louisiana...
  Southeastern Rapides Parish in central Louisiana...
  North Central St. Landry Parish in central Louisiana...

* Until 600 AM CDT.

* At 145 AM CDT, Doppler radar indicated heavy rain across the 
  warned area. Between 2 and 4 inches of rain have fallen. 
  Additional rainfall amounts of 1 to 4 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Ville Platte, Marksville, Bunkie, Mamou, Glenmora, Cheneyville, 
  Turkey Creek, Cottonport, Pine Prairie, Mansura, Lecompte, 
  Hessmer, Evergreen, Bayou Chicot, Chicot State Park, Indian Lake, 
  Whiteville, Echo, Reddell and Poland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3105 9258 3115 9259 3118 9201 3099 9203
      3091 9209 3083 9212 3064 9215 3060 9223
      3060 9232 3057 9240 3055 9255 3064 9257
      3075 9256 3088 9259

FLASH FLOOD...RADAR INDICATED

$$

Rua

1 follow-up statement

098 
WGUS74 KLCH 150750
FFSLCH

Flash Flood Statement
National Weather Service Lake Charles LA
250 AM CDT Wed Sep 15 2021

LAC009-039-079-097-151100-
/O.CON.KLCH.FF.W.0056.000000T0000Z-210915T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Avoyelles LA-Evangeline LA-Rapides LA-St. Landry LA-
250 AM CDT Wed Sep 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS 
MORNING FOR SOUTHWESTERN AVOYELLES, EVANGELINE, SOUTHEASTERN RAPIDES 
AND NORTH CENTRAL ST. LANDRY PARISHES...

At 250 AM CDT, Doppler radar indicated heavy rain across the warned 
area. Between 3 and 7 inches of rain have fallen is the last 3 
hours. Additional rainfall amounts of 1 to 4 inches are possible in 
the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Life threatening flash flooding. Heavy rain producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Ville Platte, Marksville, Bunkie, Mamou, Glenmora, Cheneyville, 
  Turkey Creek, Cottonport, Pine Prairie, Mansura, Lecompte, 
  Hessmer, Evergreen, Bayou Chicot, Chicot State Park, Indian Lake, 
  Whiteville, Echo, Reddell and Poland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3105 9258 3115 9259 3118 9201 3099 9203
      3091 9209 3083 9212 3064 9215 3060 9223
      3060 9232 3057 9240 3055 9255 3064 9257
      3075 9256 3088 9259

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Rua

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 14, 7:21 PM CDT	Wind Advisory	LCH	Cameron	72 min
Sep 15, 3:15 AM CDT	Flash Flood Warning	LCH	Avoyelles, Evangeline, Saint Landry	3 hr
Sep 15, 11:13 AM CDT	Areal Flood Warning	LCH	Avoyelles, Evangeline, Rapides, Saint Landry	6 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.