Alert archive / Louisiana / Flash Flood Warnings in 2018

Flash Flood Warning 4, NWS Lake Charles, LA

January 27, 2018Calcasieu Parish, Cameron Parish, Jefferson Davis Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at Jan 27, 2018, 8:29 AM CST for Calcasieu Parish, Cameron Parish, Jefferson Davis Parish, Louisiana. It was in force for 3 hr. 2 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: Jan 27, 2018, 8:29 AM CST (14:29 UTC)
Expired: Jan 27, 2018, 11:30 AM CST
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA

The radar

The Lake Charles radar (KLCH), 28 km from the middle of the area, began a volume at 14:32 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
Jan 27, 9:00 AM CST	HEAVY RAIN 4.73	Vinton, LA	A CPPJ ALERT GAUGE AT VINTON, LA HAS RECORDED 4.73 INCHES OF RAINFALL SINCE MIDNIGHT.
Jan 27, 10:34 AM CST	FLASH FLOOD	Lake Charles, LA	PICTURE OF FLOODING IN MOBILE HOME AREA SUBMITTED TO BROADCAST SOCIAL MEDIA PAGE BY PUBLIC.

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 12:00Z, 2.5 hours before the alert went out and 30 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: 6 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

534 
WGUS54 KLCH 271429
FFWLCH
LAC019-023-053-271730-
/O.NEW.KLCH.FF.W.0004.180127T1429Z-180127T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
829 AM CST SAT JAN 27 2018

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Northern Cameron Parish in southwestern Louisiana...
  Southwestern Jefferson Davis Parish in southwestern Louisiana...
  Calcasieu Parish in southwestern Louisiana...

* Until 1130 AM CST

* At 826 AM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Rainfall amounts of 2 to 4 
  inches of rain have fallen. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Lake Charles, Sulphur, Westlake, Welsh, Vinton, Iowa, Grand Lake,
  Lacassine National Wildlife Refuge, Lake Charles Regional Airport,
  Hayes, Carlyss, Hacketts Corner, Heberts Marina, Lebleu Settlement,
  Edgerly, Hackberry, Thornwell, Lowry, Sweet Lake and Holmwood.

Additional rainfall amounts of 2 to 4 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 3001 9376 3006 9371 3006 9370 3008 9373
      3014 9369 3015 9370 3015 9371 3017 9370
      3018 9371 3027 9369 3032 9274 2999 9273
      2996 9327 3002 9327 3005 9328 3005 9333
      2996 9334 2993 9376

$$

MM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 27, 2:49 AM CST	Flash Flood Watch	LCH	Cameron, Lafayette, Saint Landry, Saint Martin	15 hr
Jan 27, 4:40 AM CST	Areal Flood Advisory	LCH	Calcasieu, Cameron, Jefferson Davis	3 hr
Jan 27, 5:44 AM CST	Areal Flood Advisory	LCH	Vermilion	2 hr
Jan 27, 7:02 AM CST	Areal Flood Advisory	LCH	Iberia, Lafayette, Saint Martin, Vermilion	58 min
Jan 27, 7:05 AM CST	Flash Flood Warning	LCH	Calcasieu, Cameron	115 min
Jan 27, 7:40 AM CST	Areal Flood Advisory	LCH	Calcasieu, Cameron, Jefferson Davis	2 hr
Jan 27, 8:00 AM CST	Flash Flood Warning	LCH	Iberia, Lafayette, Saint Martin, Vermilion	2 hr
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Acadia, Evangeline, Saint Landry	48 hr
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Rapides	6 days
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Calcasieu	4 days
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Calcasieu	7 days
Jan 27, 11:59 AM CST	River Flood Warning	LCH	Lafayette, Vermilion	23 hr

Nearby

Flash Flood Warnings in Louisiana, 2018 Every flash flood warning in 2018

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.