Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 106, NWS Jackson, MS

April 10, 2021Catahoula Parish, Concordia Parish, Louisiana

NWS Jackson, MS issued this severe thunderstorm warning at Apr 10, 2021, 1:24 AM CDT for Catahoula Parish, Concordia Parish, Louisiana. It was in force for 51 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 10, 2021, 1:24 AM CDT (06:24 UTC)
Expired: Apr 10, 2021, 2:15 AM CDT
In force: 51 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Catahoula Parish, LA, Concordia Parish, LA

The radar

The Ft Polk radar (KPOE), 115 km from the middle of the area, began a volume at 06:27 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
Apr 9, 10:25 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.4 hours before the alert went out and 187 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: 2773 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

As transmitted.

192 
WUUS54 KJAN 100624
SVRJAN
LAC025-029-100715-
/O.NEW.KJAN.SV.W.0106.210410T0624Z-210410T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
124 AM CDT Sat Apr 10 2021

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Southwestern Concordia Parish in northeastern Louisiana...
  Southwestern Catahoula Parish in northeastern Louisiana...

* Until 215 AM CDT.

* At 124 AM CDT, a severe thunderstorm was located over Lake Ophelia
  National Wildlife Refuge, or 8 miles south of Larto, moving east at
  40 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.

* This severe thunderstorm will be near...
  Larto around 130 AM CDT.
  Acme around 135 AM CDT.
  New Era around 140 AM CDT.
  Slocum around 155 AM CDT.
  Deer Park around 200 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3130 9200 3135 9201 3151 9160 3143 9155
      3140 9158 3138 9155 3128 9151 3126 9165
      3119 9159 3114 9162 3113 9172 3116 9168
      3120 9168 3123 9179 3130 9191 3127 9195
      3123 9192 3123 9199 3127 9199 3128 9202
TIME...MOT...LOC 0624Z 255DEG 34KT 3125 9196 

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

NF

1 follow-up statement

487 
WWUS54 KJAN 100706
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
206 AM CDT Sat Apr 10 2021

LAC025-029-100716-
/O.EXP.KJAN.SV.W.0106.000000T0000Z-210410T0715Z/
Concordia LA-Catahoula LA-
206 AM CDT Sat Apr 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CONCORDIA AND
SOUTHWESTERN CATAHOULA PARISHES WILL EXPIRE AT 215 AM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
northeastern Louisiana...and southwestern Mississippi.

LAT...LON 3130 9200 3135 9201 3151 9160 3143 9155
      3140 9158 3138 9155 3128 9151 3126 9165
      3119 9159 3114 9162 3113 9172 3116 9168
      3120 9168 3123 9179 3130 9191 3127 9195
      3123 9192 3123 9199 3127 9199 3128 9202
TIME...MOT...LOC 0706Z 255DEG 34KT 3135 9153 

$$

NF

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 7:49 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland	39 min
Apr 9, 8:10 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Richland	50 min
Apr 9, 8:49 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, Madison	41 min
Apr 9, 10:03 PM CDT	Special Weather Statement	JAN	Madison, Tensas	27 min
Apr 9, 10:11 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia, Franklin	49 min
Apr 10, 12:01 AM CDT	Flash Flood Warning	JAN	Concordia	3 hr
Apr 10, 12:59 AM CDT	Special Weather Statement	JAN	Catahoula	46 min
Apr 10, 2:14 AM CDT	Flash Flood Warning	JAN	Catahoula	3 hr
Apr 10, 2:53 AM CDT	Flash Flood Warning	JAN	Concordia	118 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.