Alert archive / Louisiana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Lake Charles, LA

March 29, 2011Acadia Parish, Saint Landry Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 29, 2011, 10:11 PM CDT for Acadia Parish, Saint Landry Parish, Louisiana. It was in force for 49 min. 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: Mar 29, 2011, 10:11 PM CDT (03:11 UTC)
Expired: Mar 29, 2011, 11:00 PM CDT
In force: 49 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Acadia Parish, LA, Saint Landry Parish, LA

The radar

The Lake Charles radar (KLCH), 88 km from the middle of the area, began a volume at 03:10 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
Mar 29, 10:27 PM CDT	HAIL 1.75	6 Ene Iota, LA	QUARTER TO GOLFBALL SIZE HAIL

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 29, 8:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.2 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: 2534 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 14.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

539 
WUUS54 KLCH 300311
SVRLCH
LAC001-097-300400-
/O.NEW.KLCH.SV.W.0021.110330T0311Z-110330T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1011 PM CDT TUE MAR 29 2011

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ST. LANDRY PARISH IN CENTRAL LOUISIANA...
  ACADIA PARISH IN SOUTHWEST LOUISIANA...
  THIS INCLUDES...IOTA...CROWLEY...CHURCH POINT...

* UNTIL 1100 PM CDT

* AT 1011 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH...OVER IOTA...MOVING NORTHEAST
  AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOWATA BY 1020 PM CDT...
  BRANCH AND RICHARD BY 1035 PM CDT...
  MIRE BY 1040 PM CDT...
  CHURCH POINT BY 1045 PM CDT...
  CANKTON BY 1055 PM CDT...
  LAWTELL BY 1100 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND HEAVY RAIN. STAY INDOORS...
AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT
WEDNESDAY MORNING FOR SOUTHWESTERN LOUISIANA AND SOUTHEAST TEXAS.

&&

PLEASE REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE AT
337-477-5285 EXTENSION 1.

LAT...LON 3032 9255 3053 9218 3034 9209 3030 9213
      3016 9247
TIME...MOT...LOC 0311Z 238DEG 20KT 3030 9240

$$

1 follow-up statement

574 
WWUS54 KLCH 300340
SVSLCH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1040 PM CDT TUE MAR 29 2011

LAC001-097-300400-
/O.CON.KLCH.SV.W.0021.000000T0000Z-110330T0400Z/
ST. LANDRY LA-ACADIA LA-
1040 PM CDT TUE MAR 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR ACADIA AND SOUTHWESTERN ST. LANDRY PARISHES...

AT 1033 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
STORM WAS LOCATED NEAR MAXIE..MOVING EAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RICHARD BY 1055 PM CDT...
  BRANCH...CHURCH POINT...MIRE AND 9 MILES WEST OF CANKTON BY 1100 PM
  CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT
WEDNESDAY MORNING FOR SOUTHWESTERN LOUISIANA AND SOUTHEAST TEXAS.

&&

LAT...LON 3032 9255 3053 9218 3034 9209 3030 9213
      3016 9247
TIME...MOT...LOC 0340Z 249DEG 10KT 3033 9232

$$

BRAZZELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 9:05 PM CDT	Special Weather Statement	LCH	Beauregard	55 min
Mar 29, 9:09 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron	66 min
Mar 29, 9:42 PM CDT	Severe Thunderstorm Warning	LCH	Allen, Beauregard, Calcasieu, Jefferson Davis	63 min
Mar 29, 9:47 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Cameron, Jefferson Davis, Vermilion	43 min
Mar 29, 9:51 PM CDT	Special Weather Statement	LCH	Vermilion	39 min
Mar 29, 9:53 PM CDT	Special Marine Warning	LCH		52 min
Mar 29, 10:16 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	44 min
Mar 29, 10:18 PM CDT	Special Weather Statement	LCH	St. Mary	42 min
Mar 29, 10:24 PM CDT	Areal Flood Advisory	LCH	Calcasieu	81 min
Mar 29, 10:59 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu	46 min
Mar 29, 11:03 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Evangeline, Jefferson Davis, Saint Landry	24 min
Mar 29, 11:20 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Evangeline, Saint Landry	40 min
Mar 30, 12:01 AM CDT	Special Weather Statement	LCH	Calcasieu	44 min
Mar 30, 12:34 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Beauregard, Calcasieu, Jefferson Davis	29 min
Mar 30, 2:45 AM CDT	Special Marine Warning	LCH		60 min
Mar 30, 3:09 AM CDT	Special Weather Statement	LCH	Avoyelles	51 min
Mar 30, 3:15 AM CDT	Special Marine Warning	LCH		60 min
Mar 30, 3:40 AM CDT	Special Weather Statement	LCH	Beauregard	50 min
Mar 30, 3:43 AM CDT	Special Marine Warning	LCH		62 min
Mar 30, 3:51 AM CDT	Special Marine Warning	LCH		39 min
Mar 30, 4:25 AM CDT	Small Craft Advisory	LCH		8 hr
Mar 30, 4:30 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Beauregard	23 min
Mar 30, 4:34 AM CDT	Special Marine Warning	LCH		56 min
Mar 30, 4:38 AM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron	52 min
Mar 30, 4:43 AM CDT	Special Weather Statement	LCH	Lafayette	47 min
Mar 30, 4:46 AM CDT	Special Marine Warning	LCH		59 min
Mar 30, 4:51 AM CDT	Special Weather Statement	LCH	Allen, Evangeline	39 min
Mar 30, 4:55 AM CDT	Special Weather Statement	LCH	Assumption	50 min
Mar 30, 5:09 AM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	37 min
Mar 30, 5:16 AM CDT	Special Weather Statement	LCH	Lafayette	44 min
Mar 30, 5:27 AM CDT	Severe Thunderstorm Warning	LCH	Lafayette, Saint Landry, Saint Martin	31 min
Mar 30, 5:34 AM CDT	Special Marine Warning	LCH		56 min
Mar 30, 5:37 AM CDT	Severe Thunderstorm Warning	LCH	Saint Landry	22 min
Mar 30, 5:44 AM CDT	Special Weather Statement	LCH	Vermilion	46 min
Mar 30, 6:01 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Iberia, Lafayette, Saint Martin, Vermilion	30 min
Mar 30, 6:31 AM CDT	Special Weather Statement	LCH	Lafayette, Saint Martin	44 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2011 Every severe thunderstorm warning in 2011

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.