Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 18, NWS Shreveport, LA

April 7, 20215 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 7, 2021, 4:31 PM CDT for 5 parishes in Louisiana. It was in force for 19 min. 1 report 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 7, 2021, 4:31 PM CDT (21:31 UTC)
Expired: Apr 7, 2021, 4:50 PM CDT
In force: 19 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 47 km from the middle of the area, began a volume at 21:35 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.

What was reported inside it

Time	Report	Where	Remark
Apr 7, 4:33 PM CDT	TORNADO	10 Ssw Doyline, LA	A BRIEF TORNADO SNAPPED A FEW TREES ALONG FAIRVIEW POINT RD. AND CONTINUED ALONG A 0.9 MILE PATH, LIFTING A SECTION OF ROOFING MATERIAL ON A MOBILE HOME AND SNAPPING LARGE TREE LIMBS NEAR THE PINE COVE MARINA BEFORE LIFTING. THE PATH WIDTH WAS ABOUT 50 YDS AT

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 7, 12:38 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.5 hours before the alert went out and 39 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.

460 
WFUS54 KSHV 072131
TORSHV
LAC013-015-017-027-119-072215-
/O.NEW.KSHV.TO.W.0018.210407T2131Z-210407T2215Z/

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

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Webster Parish in northwestern Louisiana...
  Southeastern Caddo Parish in northwestern Louisiana...
  Southwestern Claiborne Parish in northwestern Louisiana...
  Northwestern Bienville Parish in northwestern Louisiana...
  Southeastern Bossier Parish in northwestern Louisiana...

* Until 515 PM CDT.
    
* At 431 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles south of Doyline, or 15 miles southeast of
  Bossier City, moving northeast at 35 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...
  Ringgold around 445 PM CDT.
  Heflin around 450 PM CDT.
  Sibley around 455 PM CDT.
  Dubberly around 500 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Curtis, Sailes, Lake Bistineau South, Noles Landing, Lake Bistineau
North, Plum Orchard Landing, Ogden, Koran 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 3226 9349 3243 9357 3262 9314 3241 9304
TIME...MOT...LOC 2131Z 246DEG 30KT 3238 9346 

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

$$

44

1 follow-up statement

096 
WWUS54 KSHV 072150
SVSSHV

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

LAC013-015-017-027-119-072200-
/O.CAN.KSHV.TO.W.0018.000000T0000Z-210407T2215Z/
Webster LA-Caddo LA-Claiborne LA-Bienville LA-Bossier LA-
450 PM CDT Wed Apr 7 2021

...THE TORNADO WARNING FOR SOUTHEASTERN WEBSTER...SOUTHEASTERN
CADDO...SOUTHWESTERN CLAIBORNE...NORTHWESTERN BIENVILLE AND
SOUTHEASTERN BOSSIER PARISHES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

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

LAT...LON 3226 9349 3243 9357 3262 9314 3241 9304
TIME...MOT...LOC 2149Z 246DEG 30KT 3245 9328 

$$

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, 4:52 PM CDT	Tornado Warning	SHV	Bienville, Red River	25 min
Apr 7, 5:16 PM CDT	Tornado Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Webster	14 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.