Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Lake Charles, LA

March 17, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 17, 2021, 1:24 PM CDT for 4 parishes in Louisiana. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 17, 2021, 1:24 PM CDT (18:24 UTC)
Expired: Mar 17, 2021, 2:00 PM CDT
In force: 36 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

Counties Acadia Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 37 km from the middle of the area, began a volume at 18:24 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.

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 17, 11:53 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.4 hours before the alert went out and 36 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: 458 J/kg
Mixed-layer CIN: -397 J/kg
Mixed-layer LCL: 1132 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

233 
WUUS54 KLCH 171824
SVRLCH
LAC001-023-053-113-171900-
/O.NEW.KLCH.SV.W.0004.210317T1824Z-210317T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lake Charles LA
124 PM CDT Wed Mar 17 2021

The National Weather Service in Lake Charles has issued a

* Severe Thunderstorm Warning for...
  Northeastern Cameron Parish in southwestern Louisiana...
  Southeastern Jefferson Davis Parish in southwestern Louisiana...
  Southwestern Acadia Parish in southwestern Louisiana...
  Northwestern Vermilion Parish in southwestern Louisiana...

* Until 200 PM CDT.

* At 123 PM CDT, a severe thunderstorm was located over Lacassine
  National Wildlife Refuge, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Jennings, Lake Arthur, Mermentau, Lacassine National Wildlife
  Refuge, Klondike, Morse, Thornwell, Lowry and Midland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM CDT for southwestern
Louisiana.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2986 9293 3001 9304 3008 9293 3008 9289
      3011 9290 3029 9263 3013 9244
TIME...MOT...LOC 1823Z 237DEG 50KT 2999 9290 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Rua

2 follow-up statements

009 
WWUS54 KLCH 171837
SVSLCH

Severe Weather Statement
National Weather Service Lake Charles LA
137 PM CDT Wed Mar 17 2021

LAC023-113-171847-
/O.CAN.KLCH.SV.W.0004.000000T0000Z-210317T1900Z/
Cameron LA-Vermilion LA-
137 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CAMERON AND
NORTHWESTERN VERMILION PARISHES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 600 PM CDT for southwestern
Louisiana.

LAT...LON 3005 9295 3008 9293 3008 9289 3011 9290
      3029 9263 3013 9244 3009 9252 3011 9254
      3012 9256 3010 9258 3009 9263 3007 9264
      3008 9265 3006 9268 3006 9269 3004 9271
TIME...MOT...LOC 1837Z 237DEG 43KT 3008 9274 

$$

LAC001-053-171900-
/O.CON.KLCH.SV.W.0004.000000T0000Z-210317T1900Z/
Jefferson Davis LA-Acadia LA-
137 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR SOUTHEASTERN JEFFERSON DAVIS AND SOUTHWESTERN ACADIA PARISHES...

At 137 PM CDT, a severe thunderstorm was located near Thornwell, or
near Lake Arthur, moving northeast at 50 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Jennings, Lake Arthur, Mermentau, Morse, Thornwell and Midland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM CDT for southwestern
Louisiana.

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 3005 9295 3008 9293 3008 9289 3011 9290
      3029 9263 3013 9244 3009 9252 3011 9254
      3012 9256 3010 9258 3009 9263 3007 9264
      3008 9265 3006 9268 3006 9269 3004 9271
TIME...MOT...LOC 1837Z 237DEG 43KT 3008 9274 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...<50MPH
 
$$

Rua

757 
WWUS54 KLCH 171858
SVSLCH

Severe Weather Statement
National Weather Service Lake Charles LA
158 PM CDT Wed Mar 17 2021

LAC001-053-171908-
/O.EXP.KLCH.SV.W.0004.000000T0000Z-210317T1900Z/
Jefferson Davis LA-Acadia LA-
158 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON DAVIS
AND SOUTHWESTERN ACADIA PARISHES WILL EXPIRE AT 200 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 600 PM CDT for southwestern
Louisiana.

LAT...LON 3005 9295 3008 9293 3008 9289 3011 9290
      3029 9263 3013 9244 3009 9252 3011 9254
      3012 9256 3010 9258 3009 9263 3007 9264
      3008 9265 3006 9268 3006 9269 3004 9271
TIME...MOT...LOC 1858Z 217DEG 25KT 3020 9261 

$$

Rua

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 2:53 AM CDT	Wind Advisory	LCH	Avoyelles, Cameron, Evangeline, Lafayette, Saint Landry, Saint Martin	16 hr
Mar 17, 2:55 AM CDT	Marine Dense Fog Advisory	LCH		11 hr
Mar 17, 2:55 AM CDT	Small Craft Advisory	LCH		52 hr
Mar 17, 12:39 PM CDT	Special Weather Statement	LCH	Cameron	51 min
Mar 17, 12:48 PM CDT	Special Weather Statement	LCH	Calcasieu	42 min
Mar 17, 1:33 PM CDT	Special Marine Warning	LCH		57 min
Mar 17, 1:40 PM CDT	Special Weather Statement	LCH	Allen	35 min
Mar 17, 1:46 PM CDT	Special Weather Statement	LCH	Vernon	29 min
Mar 17, 2:01 PM CDT	Special Weather Statement	LCH	Acadia, Jefferson Davis	44 min
Mar 17, 2:30 PM CDT	Special Marine Warning	LCH		60 min
Mar 17, 2:32 PM CDT	Special Weather Statement	LCH	Beauregard	43 min
Mar 17, 2:41 PM CDT	Small Craft Advisory	LCH		40 hr
Mar 17, 3:03 PM CDT	Special Weather Statement	LCH	Vermilion	42 min
Mar 17, 3:28 PM CDT	Special Marine Warning	LCH		62 min
Mar 17, 3:42 PM CDT	Special Weather Statement	LCH	Rapides	48 min
Mar 17, 3:44 PM CDT	Special Weather Statement	LCH	Saint Martin	46 min
Mar 17, 3:53 PM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary	52 min
Mar 17, 3:58 PM CDT	Severe Thunderstorm Warning	LCH	Cameron, Vermilion	62 min
Mar 17, 4:19 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Cameron, Jefferson Davis, Vermilion	44 min
Mar 17, 4:35 PM CDT	Special Marine Warning	LCH		55 min
Mar 17, 4:49 PM CDT	Special Weather Statement	LCH	Saint Martin	41 min
Mar 17, 5:00 PM CDT	Special Weather Statement	LCH	Acadia, Saint Landry	30 min
Mar 17, 5:31 PM CDT	Special Marine Warning	LCH		89 min
Mar 17, 6:08 PM CDT	Special Weather Statement	LCH	Iberia, St. Mary	97 min
Mar 17, 6:21 PM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary	39 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.