Alert archive / Texas / Tornado Warnings in 2021

Tornado Warning 1, NWS Shreveport, LA

February 28, 2021Cass County, Marion County, Texas; Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Feb 28, 2021, 6:07 PM CST for Cass County, Marion County, Texas; Lafayette County, Miller County, Arkansas; Bossier Parish, Caddo Parish, Louisiana. It was in force for 38 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: Feb 28, 2021, 6:07 PM CST (00:07 UTC)
Expired: Feb 28, 2021, 6:45 PM CST
In force: 38 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA, Cass County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 53 km from the middle of the area, began a volume at 00:09 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
Feb 28, 6:15 PM CST	TORNADO	2 Nw Vivian, LA	AN EF-1 TORNADO WITH ESTIMATED MAXIMUM WINDS NEAR 90 MPH TOUCHED DOWN IN A HEAVILY WOODED AREA WEST OF OLD ATLANTA ROAD JUST NORTHWEST OF VIVIAN, WHERE IS SNAPPED AND UPROOTED TREES AS IT CROSSED OLD ATLANTA ROAD. THE TORNADO CONTINUED EAST NORTHEAST ACROSS A

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
Feb 28, 5:54 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.1 hours before the alert went out and 53 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: 1289 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

As transmitted.

902 
WFUS54 KSHV 010007
TORSHV
ARC073-091-LAC015-017-TXC067-315-010045-
/O.NEW.KSHV.TO.W.0001.210301T0007Z-210301T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
607 PM CST Sun Feb 28 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  South central Miller County in southwestern Arkansas...
  Southwestern Lafayette County in southwestern Arkansas...
  Northwestern Caddo Parish in northwestern Louisiana...
  Northwestern Bossier Parish in northwestern Louisiana...
  Northeastern Marion County in northeastern Texas...
  Southeastern Cass County in northeastern Texas...

* Until 645 PM CST.
    
* At 607 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Vivian, or 17 miles south of Atlanta, moving
  northeast at 30 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...
  Vivian around 620 PM CST.
  Rodessa around 625 PM CST.
  Ida around 635 PM CST.

Other locations impacted by this tornadic thunderstorm include
Kiblah.

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 3282 9410 3285 9414 3308 9389 3299 9376
TIME...MOT...LOC 0007Z 230DEG 25KT 3287 9407 

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

$$

20

2 follow-up statements

593 
WWUS54 KSHV 010018
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
618 PM CST Sun Feb 28 2021

TXC067-315-010027-
/O.CAN.KSHV.TO.W.0001.000000T0000Z-210301T0045Z/
Marion TX-Cass TX-
618 PM CST Sun Feb 28 2021

...THE TORNADO WARNING FOR NORTHEASTERN MARION AND SOUTHEASTERN CASS
COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CST for
southwestern Arkansas...and northwestern Louisiana.

LAT...LON 3286 9401 3294 9404 3308 9389 3299 9376
TIME...MOT...LOC 0017Z 230DEG 25KT 3292 9400 

$$

ARC073-091-LAC015-017-010045-
/O.CON.KSHV.TO.W.0001.000000T0000Z-210301T0045Z/
Miller AR-Lafayette AR-Caddo LA-Bossier LA-
618 PM CST Sun Feb 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CST FOR SOUTH
CENTRAL MILLER AND SOUTHWESTERN LAFAYETTE COUNTIES...NORTHWESTERN
CADDO AND NORTHWESTERN BOSSIER PARISHES...
    
At 617 PM CST, a severe thunderstorm capable of producing a tornado
was located near Vivian, or 16 miles southeast of Atlanta, moving
northeast at 30 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...
  Ida around 635 PM CST.

Other locations impacted by this tornadic thunderstorm include
Kiblah.

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 3286 9401 3294 9404 3308 9389 3299 9376
TIME...MOT...LOC 0017Z 230DEG 25KT 3292 9400 

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

$$

20

006 
WWUS54 KSHV 010034
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
634 PM CST Sun Feb 28 2021

ARC073-091-LAC015-017-010045-
/O.CON.KSHV.TO.W.0001.000000T0000Z-210301T0045Z/
Miller AR-Lafayette AR-Caddo LA-Bossier LA-
634 PM CST Sun Feb 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CST FOR SOUTH
CENTRAL MILLER AND SOUTHWESTERN LAFAYETTE COUNTIES...NORTH CENTRAL
CADDO AND NORTHWESTERN BOSSIER PARISHES...
    
At 633 PM CST, a severe thunderstorm capable of producing a tornado
was located over Ida, or 17 miles southeast of Atlanta, moving
northeast at 30 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
south central Miller and southwestern Lafayette Counties, north
central Caddo and northwestern Bossier Parishes, including the
following locations... Kiblah.

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 3292 9389 3300 9396 3308 9389 3299 9376
TIME...MOT...LOC 0033Z 230DEG 25KT 3299 9390 

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

$$

20

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 6:18 PM CST	Special Weather Statement	SHV	Marion	27 min
Feb 28, 8:36 PM CST	Special Weather Statement	SHV	Camp, Titus, Upshur, Wood	39 min
Feb 28, 10:36 PM CST	Special Weather Statement	SHV	Upshur	39 min
Mar 1, 6:02 AM CST	River Flood Warning	SHV	Gregg	48 hr
Mar 1, 10:27 AM CST	River Flood Warning	SHV	Anderson, Cherokee, Houston	12 days
Mar 1, 12:24 PM CST	River Flood Warning	SHV	Gregg, Harrison, Marion, Upshur	21 days
Feb 28, 6:41 PM CST	Special Weather Statement	SHV	Nevada	34 min
Feb 28, 6:44 PM CST	Severe Thunderstorm Warning	SHV	Lafayette, Miller	31 min
Feb 28, 7:16 PM CST	Special Weather Statement	SHV	Nevada	44 min
Feb 28, 11:37 PM CST	Special Weather Statement	SHV	Lafayette, Miller	38 min
Mar 1, 12:16 AM CST	Special Weather Statement	SHV	Nevada	29 min
Mar 1, 3:58 PM CST	Areal Flood Advisory	SHV	Union	2 hr
Feb 28, 8:08 PM CST	Tornado Warning	SHV	Bossier, Caddo, Webster	52 min
Mar 1, 12:27 PM CST	River Flood Warning	SHV	Bienville, Bossier, Red River, Webster	11 days

Nearby

Tornado Warnings in Texas, 2021 Tornado Warnings in Arkansas, 2021 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.