Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 20, NWS Shreveport, LA

April 7, 20215 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 7, 2021, 5:16 PM CDT for 5 parishes in Louisiana. It was in force for 14 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, 5:16 PM CDT (22:16 UTC)
Expired: Apr 7, 2021, 5:30 PM CDT
In force: 14 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Bienville Parish, LA, Claiborne Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 81 km from the middle of the area, began a volume at 22:16 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 7, 12:38 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.3 hours before the alert went out and 72 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: 532 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 433 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

336 
WFUS54 KSHV 072216
TORSHV
LAC013-027-049-061-119-072300-
/O.NEW.KSHV.TO.W.0020.210407T2216Z-210407T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
516 PM CDT Wed Apr 7 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Webster Parish in northwestern Louisiana...
  Northwestern Jackson Parish in north central Louisiana...
  Southeastern Claiborne Parish in northwestern Louisiana...
  Central Bienville Parish in northwestern Louisiana...
  Western Lincoln Parish in north central Louisiana...

* Until 600 PM CDT.
    
* At 515 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles east of Heflin, or 16 miles southeast of
  Minden, moving northeast at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Gibsland around 525 PM CDT.
  Arcadia around 535 PM CDT.
  Grambling around 550 PM CDT.
  Ruston around 555 PM CDT.

Other locations impacted by this tornadic thunderstorm include Brice,
Aycock, Simsboro, Liberty Hill, Sailes, Bryceland, Bienville,
Corinth, Ogden and Ada.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3227 9313 3247 9327 3280 9281 3239 9257
TIME...MOT...LOC 2215Z 238DEG 40KT 3241 9312 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

44

1 follow-up statement

260 
WWUS54 KSHV 072230
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
530 PM CDT Wed Apr 7 2021

LAC013-027-049-061-119-072239-
/O.CAN.KSHV.TO.W.0020.000000T0000Z-210407T2300Z/
Webster LA-Jackson LA-Claiborne LA-Bienville LA-Lincoln LA-
530 PM CDT Wed Apr 7 2021

...THE TORNADO WARNING FOR SOUTHEASTERN WEBSTER...NORTHWESTERN
JACKSON...SOUTHEASTERN CLAIBORNE...CENTRAL BIENVILLE AND WESTERN
LINCOLN PARISHES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has 
weakened. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CDT for north central
and northwestern Louisiana.

LAT...LON 3227 9313 3247 9327 3280 9281 3239 9257
TIME...MOT...LOC 2223Z 238DEG 40KT 3249 9296 

$$

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 1:22 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	38 min
Apr 7, 1:50 PM CDT	Special Weather Statement	SHV	De Soto	40 min
Apr 7, 3:12 PM CDT	Special Weather Statement	SHV	Lincoln, Union	48 min
Apr 7, 3:21 PM CDT	Special Weather Statement	SHV	Claiborne, Webster	39 min
Apr 7, 3:56 PM CDT	Special Weather Statement	SHV	De Soto	49 min
Apr 7, 4:09 PM CDT	Special Weather Statement	SHV	Claiborne	51 min
Apr 7, 4:20 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Caddo, De Soto, Red River	40 min
Apr 7, 4:31 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Caddo, Claiborne, Webster	19 min
Apr 7, 4:52 PM CDT	Tornado Warning	SHV	Bienville, Red River	25 min
Apr 7, 5:36 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	39 min
Apr 7, 6:38 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita, Union	52 min

Nearby

Tornado Warnings in Louisiana, 2021 Every tornado warning in 2021 Tornadoes 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.