Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Lake Charles, LA

April 7, 2021Vernon Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Apr 7, 2021, 7:53 PM CDT for Vernon Parish, Louisiana. It was in force for 16 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: Apr 7, 2021, 7:53 PM CDT (00:53 UTC)
Expired: Apr 7, 2021, 8:09 PM CDT
In force: 16 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Vernon Parish, LA

The radar

The Ft Polk radar (KPOE), 16 km from the middle of the area, began a volume at 00:52 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.9 hours before the alert went out and 101 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: 1905 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

As transmitted.

231 
WUUS54 KLCH 080053
SVRLCH
LAC115-080145-
/O.NEW.KLCH.SV.W.0021.210408T0053Z-210408T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lake Charles LA
753 PM CDT Wed Apr 7 2021

The National Weather Service in Lake Charles has issued a

* Severe Thunderstorm Warning for...
  Southeastern Vernon Parish in west central Louisiana...

* Until 845 PM CDT.

* At 752 PM CDT, a severe thunderstorm was located near Fort Polk,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fort Polk, Fullerton, Cravens and Leander. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3096 9319 3109 9320 3117 9283 3093 9283
TIME...MOT...LOC 0052Z 259DEG 21KT 3103 9314 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

24

1 follow-up statement

457 
WWUS54 KLCH 080109
SVSLCH

Severe Weather Statement
National Weather Service Lake Charles LA
809 PM CDT Wed Apr 7 2021

LAC115-080119-
/O.CAN.KLCH.SV.W.0021.000000T0000Z-210408T0145Z/
Vernon LA-
809 PM CDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN VERNON PARISH IS
CANCELLED...
                
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 has been cancelled.  However small hail and
gusty winds are still possible with this thunderstorm.

LAT...LON 3096 9319 3109 9320 3117 9283 3093 9283
TIME...MOT...LOC 0107Z 259DEG 21KT 3105 9302 

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 7:07 PM CDT	Special Weather Statement	LCH	Vernon	38 min
Apr 7, 8:17 PM CDT	Special Weather Statement	LCH	Vernon	43 min
Apr 7, 8:33 PM CDT	Special Weather Statement	LCH	Rapides	42 min
Apr 7, 9:01 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	44 min
Apr 7, 9:11 PM CDT	Tornado Warning	LCH	Avoyelles, Rapides	19 min
Apr 7, 9:33 PM CDT	Special Weather Statement	LCH	Allen, Beauregard, Evangeline	42 min
Apr 7, 9:37 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles	38 min
Apr 7, 9:44 PM CDT	Tornado Warning	LCH	Avoyelles	31 min
Apr 7, 10:11 PM CDT	Tornado Warning	LCH	Avoyelles	19 min
Apr 7, 11:39 PM CDT	Special Weather Statement	LCH	Saint Landry	51 min
Apr 8, 12:31 AM CDT	Severe Thunderstorm Warning	LCH	Saint Landry	16 min
Apr 8, 12:39 AM CDT	Special Weather Statement	LCH	Lafayette	36 min
Apr 8, 6:22 AM CDT	Dense Fog Advisory	LCH	Avoyelles, Rapides	3 hr

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.