Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Lake Charles, LA

April 5, 2012Saint Martin Parish, St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Apr 5, 2012, 3:37 AM CDT for Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 23 min. 3 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: Apr 5, 2012, 3:37 AM CDT (08:37 UTC)
Expired: Apr 5, 2012, 4:00 AM CDT
In force: 23 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Saint Martin Parish, LA, St. Mary Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 5, 3:54 AM CDT	HAIL 1	Morgan City, LA	ST MARY SHERIFFS OFFICE REPORTS QUARTER SIZE HAIL NEAR MORGAN CITY
Apr 5, 3:57 AM CDT	HAIL 1	Amelia, LA	PUBLIC REPORTS VIA FACEBOOK QUARTER SIZE HAIL NEAR AMELIA. TIME ESTIMATED BY RADAR
Apr 5, 4:07 AM CDT	HAIL 1	Morgan City, LA	PUBLIC REPORTS VIA FACEBOOK QUARTER SIZE HAIL NEAR MORGAN CITY.

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
Apr 5, 1:53 AM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.6 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: 593 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1126 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

532 
WUUS54 KLCH 050837
SVRLCH
LAC099-101-050900-
/O.NEW.KLCH.SV.W.0039.120405T0837Z-120405T0900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
337 AM CDT THU APR 5 2012

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN ST. MARTIN PARISH IN SOUTH CENTRAL
  LOUISIANA...
  THIS INCLUDES STEPHENSVILLE...
  EAST CENTRAL ST. MARY PARISH IN SOUTH CENTRAL LOUISIANA...
  THIS INCLUDES...PATTERSON...MORGAN CITY...BERWICK...BAYOU VISTA...

* UNTIL 400 AM CDT

* AT 337 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL....  
  OVER PATTERSON...MOVING EAST AT 20 MPH. QUARTER SIZE HAIL WAS 
  RECENTLY REPORTED IN PATTERSON.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BERWICK BY 350 AM CDT...
  MORGAN CITY BY 355 AM CDT...
  STEPHENSVILLE AND AMELIA BY 400 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL PRODUCE DAMAGING HAIL...CAPABLE OF CAUSING EXTENSIVE
PROPERTY DAMAGE AND SERIOUS INJURY. TAKE COVER NOW AND AVOID WINDOWS.

&&

PLEASE REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT FOR RELAY TO 
THE NATIONAL WEATHER SERVICE.

LAT...LON 2973 9110 2966 9109 2964 9110 2959 9137
      2977 9143 2985 9114 2983 9111 2981 9109
      2976 9108 2975 9108
TIME...MOT...LOC 0837Z 255DEG 17KT 2970 9130

$$

25

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:18 PM CDT	Special Marine Warning	LCH		39 min
Apr 4, 8:25 PM CDT	Special Marine Warning	LCH		69 min
Apr 4, 8:38 PM CDT	River Flood Warning	LCH	Calcasieu	6 days
Apr 4, 10:25 PM CDT	Special Marine Warning	LCH		65 min
Apr 5, 12:55 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Evangeline, Rapides	35 min
Apr 5, 1:22 AM CDT	Tornado Warning	LCH	Avoyelles	23 min
Apr 5, 1:44 AM CDT	Tornado Warning	LCH	Avoyelles, Saint Landry	31 min
Apr 5, 2:44 AM CDT	Special Weather Statement	LCH	St. Mary	31 min
Apr 5, 3:25 AM CDT	Special Weather Statement	LCH	St. Mary	35 min
Apr 5, 4:30 AM CDT	Special Weather Statement	LCH	Saint Martin	45 min
Apr 5, 5:26 AM CDT	Special Weather Statement	LCH	Assumption	34 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.