Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 34, NWS Shreveport, LA

November 11, 2021Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 11, 2021, 1:14 AM CST for Bossier Parish, Caddo Parish, Louisiana. It was in force for 22 min. 3 reports 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: Nov 11, 2021, 1:14 AM CST (07:14 UTC)
Expired: Nov 11, 2021, 1:36 AM CST
In force: 22 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Bossier Parish, LA, Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 6 km from the middle of the area, began a volume at 07:15 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
Nov 11, 1:20 AM CST	TSTM WND DMG	6 Ssw Barksdale Air For, LA	LARGE TREE LIMBS DOWN IN THE PEPPER TREE SUBDIVISION IN SE SHREVEPORT.
Nov 11, 1:20 AM CST	TSTM WND DMG	6 Ssw Barksdale Air For, LA	FENCE BLOWN DOWN AND SIDING DAMAGE ON OUT BUILDING.
Nov 11, 1:20 AM CST	TSTM WND DMG	6 Ssw Barksdale Air For, LA	IN THE GROVER PLACE SUBDIVISION ON GROVER PLACE DRIVE, A FENCE WAS BLOWN DOWN AND SIDING WAS DAMAGE ON AN OUT BUILDING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 7.2 hours before the alert went out and 5 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: 158 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

759 
WFUS54 KSHV 110714
TORSHV
LAC015-017-110800-
/O.NEW.KSHV.TO.W.0034.211111T0714Z-211111T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
114 AM CST Thu Nov 11 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southwestern Caddo Parish in northwestern Louisiana...
  Southwestern Bossier Parish in northwestern Louisiana...

* Until 200 AM CST.
    
* At 113 AM CST, a line of severe thunderstorms capable of producing 
  a tornado was located over Shreveport, moving east 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...
  Fosters around 125 AM CST.

Other locations impacted by this tornadic thunderstorm include
Ferguson, Taylortown, Linton, Cross Lake, Forbing, Barksdale Air
Force Base and Red Chute.

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 3235 9392 3264 9393 3273 9363 3238 9360
TIME...MOT...LOC 0713Z 263DEG 39KT 3246 9383 

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

$$

24

2 follow-up statements

005 
WWUS54 KSHV 110729
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
129 AM CST Thu Nov 11 2021

LAC015-017-110800-
/O.CON.KSHV.TO.W.0034.000000T0000Z-211111T0800Z/
Caddo LA-Bossier LA-
129 AM CST Thu Nov 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 AM CST FOR
SOUTHEASTERN CADDO AND SOUTH CENTRAL BOSSIER PARISHES...
    
At 128 AM CST, a severe thunderstorm capable of producing a tornado 
was located near Southeast Bossier City near the Jimmy Davis Bridge, 
moving east at 40 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 tornadic thunderstorm will remain over mainly rural areas of
southeastern Caddo and south central Bossier Parishes, including the
following locations... Taylortown, Ferguson, Forbing, Barksdale Air
Force Base and Red Chute.

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 3238 9373 3246 9375 3257 9366 3258 9363
      3238 9360
TIME...MOT...LOC 0728Z 277DEG 36KT 3242 9366 

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

$$

24

938 
WWUS54 KSHV 110736
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
136 AM CST Thu Nov 11 2021

LAC015-017-110745-
/O.CAN.KSHV.TO.W.0034.000000T0000Z-211111T0800Z/
Caddo LA-Bossier LA-
136 AM CST Thu Nov 11 2021

...THE TORNADO WARNING FOR SOUTHEASTERN CADDO AND SOUTH CENTRAL
BOSSIER PARISHES IS CANCELLED...
    
The tornadic thunderstorm line which prompted the warning has 
weakened a bit and moved out of the warned area. Therefore, the 
warning has been cancelled.

LAT...LON 3238 9373 3246 9375 3257 9366 3258 9363
      3238 9360
TIME...MOT...LOC 0730Z 263DEG 39KT 3243 9357 

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 11, 12:36 AM CST	Special Weather Statement	SHV	Bossier, Caddo	39 min
Nov 11, 12:50 AM CST	Tornado Warning	SHV	Caddo	25 min
Nov 11, 1:18 AM CST	Special Weather Statement	SHV	De Soto	57 min
Nov 11, 1:23 AM CST	Special Weather Statement	SHV	Bossier, Webster	67 min
Nov 11, 1:32 AM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more	58 min
Nov 11, 2:05 AM CST	Tornado Warning	SHV	Bienville, Red River	25 min
Nov 11, 2:20 AM CST	Special Weather Statement	SHV	Red River, Sabine	40 min
Nov 11, 2:30 AM CST	Special Weather Statement	SHV	Bienville, Lincoln	45 min
Nov 11, 2:56 AM CST	Special Weather Statement	SHV	Jackson, Lincoln, Union	34 min
Nov 11, 2:59 AM CST	Special Weather Statement	SHV	Natchitoches, Sabine, Winn	46 min
Nov 11, 3:26 AM CST	Special Weather Statement	SHV	Ouachita	64 min
Nov 11, 3:45 AM CST	Special Weather Statement	SHV	Caldwell, Grant, Winn	60 min
Nov 11, 4:36 AM CST	Special Weather Statement	SHV	LaSalle	24 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.