Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Shreveport, LA

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

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2021, 2:16 PM CDT for Union County, Arkansas; Claiborne Parish, Lincoln Parish, Union Parish, Louisiana. It was in force for 44 min. 2 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: Mar 17, 2021, 2:16 PM CDT (19:16 UTC)
Expired: Mar 17, 2021, 3:00 PM CDT
In force: 44 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Union County, AR, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 150 km from the middle of the area, began a volume at 19:21 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
Mar 17, 2:26 PM CDT	TORNADO	6 W Farmerville, LA	AN EF1 TORNADO TOUCHED DOWN ALONG EDMONDS CREEK AND MOVED NORTHEASTWARD, SNAPPING AND UPROOTING HUNDREDS OF TREES ALONG ITS 2.7 MILE PATH. SEVERAL HOMES, AWNINGS, AND VEHICLES WERE DAMAGED BY THE FALLING TREES. THE PATH ENDED JUST NORTH OF HWY 2, WEST OF FARME
Mar 17, 2:31 PM CDT	TORNADO	5 W Farmerville, LA	EMERGENCY MANAGER FOR UNION PARISH CONFIRMED AT LEAST A SHORT TREE DAMAGE PATH JUST WEST OF FARMERVILLE, CROSSING HIGHWAY 2. AN NWS STORM SURVEY WILL FINALIZE DAMAGE MAGNITUDE AT A LATER DATE.

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
Mar 17, 12:57 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.3 hours before the alert went out and 141 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.

368 
WUUS54 KSHV 171916
SVRSHV
ARC139-LAC027-061-111-172000-
/O.NEW.KSHV.SV.W.0021.210317T1916Z-210317T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
216 PM CDT Wed Mar 17 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  South central Union County in south central Arkansas...
  Union Parish in north central Louisiana...
  Eastern Claiborne Parish in northwestern Louisiana...
  Northeastern Lincoln Parish in north central Louisiana...

* Until 300 PM CDT.

* At 216 PM CDT, a severe thunderstorm was located near Bernice, or
  14 miles north of Ruston, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Farmerville, Bernice, Strong, Cooley, Dubach, Marion, Vienna,
  Spearsville, Aurelle, Oakland, Linville, Haile, Bayou D Arbonne
  Lake, Cecil, Shiloh, Unionville and Litroe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM CDT for north central
Louisiana.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3261 9265 3276 9276 3315 9238 3293 9207
      3292 9207 3292 9208 3287 9208 3285 9207
TIME...MOT...LOC 1916Z 231DEG 37KT 3274 9264 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

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, 2:32 PM CDT	Tornado Warning	SHV	Union	43 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

Severe Thunderstorm Warnings in Louisiana, 2021 Severe Thunderstorm Warnings in Arkansas, 2021 Every severe thunderstorm warning 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.