Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Lake Charles, LA

August 10, 2012Rapides Parish, Vernon Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Aug 10, 2012, 1:34 AM CDT for Rapides Parish, Vernon Parish, Louisiana. It was in force for 35 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: Aug 10, 2012, 1:34 AM CDT (06:34 UTC)
Expired: Aug 10, 2012, 2:09 AM CDT
In force: 35 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Rapides Parish, LA, Vernon Parish, LA

What was reported inside it

Time	Report	Where	Remark
Aug 10, 2:00 AM CDT	TSTM WND DMG	10 W Woodworth, LA	TREE DOWN IN ELMER...RAPIDES PARISH LOUISIANA

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, 6.6 hours before the alert went out and 151 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: 2742 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1064 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

070 
WUUS54 KLCH 100634
SVRLCH
LAC079-115-100730-
/O.NEW.KLCH.SV.W.0077.120810T0634Z-120810T0730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
134 AM CDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN RAPIDES PARISH IN CENTRAL LOUISIANA...
  THIS INCLUDES...LENA...BOYCE...
  EAST CENTRAL VERNON PARISH IN WEST CENTRAL LOUISIANA...

* UNTIL 230 AM CDT

* AT 134 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH...OVER BOYCE...MOVING SOUTH AT
  15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GARDNER BY 200 AM CDT...
  OTIS BY 215 AM CDT...
  SIEPER BY 220 AM 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.

&&

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

LAT...LON 3150 9271 3150 9268 3146 9270 3144 9268
      3140 9267 3140 9262 3141 9254 3113 9257
      3116 9289 3147 9280 3152 9271
TIME...MOT...LOC 0634Z 006DEG 13KT 3137 9269

$$

21

1 follow-up statement

509 
WWUS54 KLCH 100709
SVSLCH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
209 AM CDT FRI AUG 10 2012

LAC079-115-100719-
/O.CAN.KLCH.SV.W.0077.000000T0000Z-120810T0730Z/
RAPIDES LA-VERNON LA-
209 AM CDT FRI AUG 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL VERNON AND
WESTERN RAPIDES PARISHES IS CANCELLED...

LAT...LON 3150 9271 3150 9268 3146 9270 3144 9268
      3140 9267 3140 9262 3141 9254 3113 9257
      3116 9289 3147 9280 3152 9271
TIME...MOT...LOC 0709Z 006DEG 13KT 3124 9271

$$

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:46 PM CDT	Special Weather Statement	LCH	St. Mary	59 min
Aug 9, 11:18 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	72 min
Aug 10, 12:31 AM CDT	Special Weather Statement	LCH	Avoyelles	59 min
Aug 10, 1:49 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Evangeline, Rapides	56 min
Aug 10, 2:39 AM CDT	Special Weather Statement	LCH	Acadia, Allen, Evangeline	66 min
Aug 10, 5:49 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	56 min
Aug 10, 6:29 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles	37 min
Aug 10, 1:42 PM CDT	Special Marine Warning	LCH		63 min
Aug 10, 2:31 PM CDT	Special Weather Statement	LCH	St. Mary	59 min
Aug 10, 5:18 PM CDT	Special Weather Statement	LCH	Beauregard	57 min
Aug 10, 5:46 PM CDT	Special Weather Statement	LCH	Allen	59 min
Aug 10, 6:43 PM CDT	Special Weather Statement	LCH	Allen, Rapides	62 min
Aug 10, 6:50 PM CDT	Severe Thunderstorm Warning	LCH	Calcasieu	40 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2012 Every severe thunderstorm warning in 2012

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.