Alert archive / Louisiana / Flash Flood Warnings in 2017

Flash Flood Warning 34, NWS Lake Charles, LA

May 30, 2017Iberia Parish, St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this flash flood warning at May 30, 2017, 10:37 AM CDT for Iberia Parish, St. Mary Parish, Louisiana. It was in force for 3 hr. 1 report 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: May 30, 2017, 10:37 AM CDT (15:37 UTC)
Expired: May 30, 2017, 1:30 PM CDT
In force: 3 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Iberia Parish, LA, St. Mary Parish, LA

The radar

The Lake Charles radar (KLCH), 144 km from the middle of the area, began a volume at 15:38 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
May 30, 11:49 AM CDT	FLASH FLOOD	Ssw New Iberia, LA	BROADCAST MEDIA PICTURE POSTED OF ROADWAYS FLOODING WITH WATER UP TO BUILDINGS. CAPTION STATED FLOODING IN HOMES AND BUSINESSES.

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, 3.6 hours before the alert went out and 142 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: 324 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

733 
WGUS54 KLCH 301537
FFWLCH
LAC045-101-301830-
/O.NEW.KLCH.FF.W.0034.170530T1537Z-170530T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
1037 AM CDT TUE MAY 30 2017

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Iberia Parish in south central Louisiana...
  Northwestern St. Mary Parish in south central Louisiana...

* Until 130 PM CDT

* At 1036 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 1 to 5 inches of rain have 
  fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  New Iberia, Franklin, Jeanerette, Avery Island, Baldwin,
  Loreauville, Glencoe, Lydia, Acadiana Regional Airport, Sorrel,
  Cote Blanche Island, Coteau, Lake Fausse Pointe, Charenton and
  Weeks Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2964 9160 2965 9164 2975 9162 2973 9182
      2975 9188 2980 9185 2978 9183 2982 9182
      2984 9190 2981 9194 2983 9197 3007 9195
      3004 9182 3009 9177 3007 9163 3003 9160
      3005 9142

$$

Tingler

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:42 AM CDT	Special Marine Warning	LCH		93 min
May 30, 8:02 AM CDT	Special Weather Statement	LCH	Vermilion	43 min
May 30, 8:27 AM CDT	Tornado Warning	LCH	Vermilion	18 min
May 30, 8:38 AM CDT	Flash Flood Warning	LCH	Iberia, St. Mary	2 hr
May 30, 9:02 AM CDT	Special Marine Warning	LCH		88 min
May 30, 9:11 AM CDT	Special Marine Warning	LCH		2 hr
May 30, 9:45 AM CDT	Areal Flood Advisory	LCH	Iberia, St. Mary, Vermilion	2 hr
May 30, 10:40 AM CDT	Areal Flood Advisory	LCH	Iberia, Lafayette, Saint Martin	2 hr
May 30, 10:44 AM CDT	Areal Flood Advisory	LCH	Iberia, Saint Martin, St. Mary	2 hr
May 30, 11:05 AM CDT	Special Marine Warning	LCH		115 min
May 30, 1:15 PM CDT	Special Marine Warning	LCH		2 hr
May 30, 1:31 PM CDT	Flash Flood Warning	LCH	Iberia, Saint Martin, St. Mary	3 hr

Nearby

Flash Flood Warnings in Louisiana, 2017 Every flash flood warning in 2017

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.