Alert archive / Arkansas / Tornado Warnings in 2021

Tornado Warning 4, NWS Shreveport, LA

March 17, 2021Union County, Arkansas; Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 17, 2021, 2:32 PM CDT for Union County, Arkansas; Union Parish, Louisiana. It was in force for 43 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: Mar 17, 2021, 2:32 PM CDT (19:32 UTC)
Expired: Mar 17, 2021, 3:15 PM CDT
In force: 43 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Union County, AR, Union Parish, LA

The radar

The Shreveport radar (KSHV), 162 km from the middle of the area, began a volume at 19:34 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
Mar 17, 12:57 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.5 hours before the alert went out and 152 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: 1417 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 682 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 14.5

Open this sounding in Storm Lab

The text

As transmitted.

923 
WFUS54 KSHV 171932
TORSHV
ARC139-LAC111-172015-
/O.NEW.KSHV.TO.W.0004.210317T1932Z-210317T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
232 PM CDT Wed Mar 17 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Union County in south central Arkansas...
  Northwestern Union Parish in north central Louisiana...

* Until 315 PM CDT.
    
* At 232 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Farmerville, or 21 miles northeast of Ruston,
  moving northeast at 35 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Farmerville around 235 PM CDT.
  Huttig around 310 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Felsenthal, Bayou D Arbonne Lake, Marion, Cecil, Oakland, Linville,
Haile and Litroe.

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 3268 9246 3282 9259 3301 9235 3313 9218
      3299 9207 3298 9208 3297 9207 3297 9208
      3292 9207 3292 9208 3287 9208 3285 9206
TIME...MOT...LOC 1932Z 235DEG 31KT 3280 9246 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Thorne

1 follow-up statement

913 
WWUS54 KSHV 171959
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
259 PM CDT Wed Mar 17 2021

ARC139-LAC111-172015-
/O.CON.KSHV.TO.W.0004.000000T0000Z-210317T2015Z/
Union AR-Union LA-
259 PM CDT Wed Mar 17 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR
SOUTHEASTERN UNION COUNTY IN SOUTH CENTRAL ARKANSAS AND NORTHEASTERN
UNION PARISHES...
    
At 259 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Huttig, moving northeast at 35 mph.

HAZARD...Tornado and quarter size hail.

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...
  Huttig around 310 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Felsenthal, Marion, Cecil, Oakland, Linville, Haile and Litroe.

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 3278 9223 3296 9241 3301 9235 3313 9218
      3299 9207 3298 9208 3297 9207 3297 9208
      3292 9207 3292 9208 3287 9208 3285 9206
TIME...MOT...LOC 1959Z 235DEG 31KT 3293 9223 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Thorne

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 12:14 AM CDT	Special Weather Statement	SHV	Union	46 min
Mar 17, 12:21 AM CDT	Severe Thunderstorm Warning	SHV	Union	39 min
Mar 17, 2:01 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette	44 min
Mar 17, 2:41 AM CDT	Special Weather Statement	SHV	Miller	49 min
Mar 17, 2:45 AM CDT	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	40 hr
Mar 17, 7:36 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	54 min
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	Lafayette, Miller	56 min
Mar 17, 8:37 AM CDT	Special Weather Statement	SHV	Hempstead, Lafayette, Miller, Nevada	53 min
Mar 17, 9:26 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette, Nevada	64 min
Mar 17, 2:16 PM CDT	Severe Thunderstorm Warning	SHV	Union	44 min
Mar 17, 8:40 AM CDT	Severe Thunderstorm Warning	SHV	Caddo	44 min
Mar 17, 9:29 AM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	61 min
Mar 17, 9:31 AM CDT	Special Weather Statement	SHV	Bossier, Caddo, Webster	59 min
Mar 17, 10:29 AM CDT	Special Weather Statement	SHV	De Soto	61 min
Mar 17, 10:36 AM CDT	Special Weather Statement	SHV	Claiborne, Webster	39 min
Mar 17, 11:02 AM CDT	Special Weather Statement	SHV	Bienville, Red River, Webster	43 min
Mar 17, 11:46 AM CDT	Special Weather Statement	SHV	Bienville, Jackson, Red River	59 min
Mar 17, 12:36 PM CDT	Special Weather Statement	SHV	Natchitoches, Red River, Sabine	39 min
Mar 17, 2:08 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Ouachita, Union	52 min
Mar 17, 2:58 PM CDT	Tornado Warning	SHV	Lincoln, Ouachita, Union	47 min
Mar 17, 3:12 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita, Union	48 min
Mar 17, 3:34 PM CDT	Tornado Warning	SHV	Union	10 min

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.