Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Shreveport, LA

March 17, 20215 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2021, 2:08 PM CDT for 5 parishes in Louisiana. It was in force for 52 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: Mar 17, 2021, 2:08 PM CDT (19:08 UTC)
Expired: Mar 17, 2021, 3:00 PM CDT
In force: 52 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Bienville Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 109 km from the middle of the area, began a volume at 19:07 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

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, 7.1 hours before the alert went out and 101 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.

236 
WUUS54 KSHV 171908
SVRSHV
LAC013-049-061-073-111-172000-
/O.NEW.KSHV.SV.W.0020.210317T1908Z-210317T2000Z/

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

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northern Jackson Parish in north central Louisiana...
  South central Union Parish in north central Louisiana...
  West central Ouachita Parish in north central Louisiana...
  East central Bienville Parish in northwestern Louisiana...
  Southeastern Lincoln Parish in north central Louisiana...

* Until 300 PM CDT.

* At 207 PM CDT, a severe thunderstorm was located 10 miles northwest
  of Jonesboro, moving northeast at 50 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...
  Ruston, Grambling, Brownsville-Bawcomville, Choudrant, Simsboro,
  Hodge, North Hodge, Vienna, East Hodge, Bienville, Quitman, Eros,
  Downsville, D Arbonne, Calhoun, Brice, Folksville, Friendship,
  Cheniere and Liberty Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3223 9288 3235 9299 3279 9249 3243 9214
TIME...MOT...LOC 1907Z 238DEG 46KT 3232 9286 

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

Thorne

1 follow-up statement

942 
WWUS54 KSHV 171940
SVSSHV

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

LAC013-171950-
/O.CAN.KSHV.SV.W.0020.000000T0000Z-210317T2000Z/
Bienville LA-
240 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BIENVILLE PARISH
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 3241 9255 3254 9277 3279 9249 3255 9226
TIME...MOT...LOC 1940Z 238DEG 46KT 3255 9243 

$$

LAC049-061-073-111-172000-
/O.CON.KSHV.SV.W.0020.000000T0000Z-210317T2000Z/
Jackson LA-Union LA-Ouachita LA-Lincoln LA-
240 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR NORTH CENTRAL JACKSON...SOUTH CENTRAL UNION...WEST CENTRAL
OUACHITA AND EASTERN LINCOLN PARISHES...

At 240 PM CDT, a severe thunderstorm was located 12 miles east of
Ruston, moving northeast at 55 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...
Ruston, Grambling, Choudrant, Vienna, Downsville, D Arbonne, Calhoun,
Eureka and Folksville.

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 3241 9255 3254 9277 3279 9249 3255 9226
TIME...MOT...LOC 1940Z 238DEG 46KT 3255 9243 

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, 2:45 AM CDT	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	40 hr
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	56 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, 2:16 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	44 min
Mar 17, 2:32 PM CDT	Tornado Warning	SHV	Union	43 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 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.