Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 159, NWS Shreveport, LA

May 28, 202112 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 28, 2021, 3:15 AM CDT for 12 parishes in Louisiana. It was in force for 60 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: May 28, 2021, 3:15 AM CDT (08:15 UTC)
Expired: May 28, 2021, 4:15 AM CDT
In force: 60 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 102 km from the middle of the area, began a volume at 08:18 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
May 28, 3:40 AM CDT	TSTM WND DMG	6 Ese Farmerville, LA	TREE FELL ON A VEHICLE.

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, 8.3 hours before the alert went out and 93 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: 686 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1424 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

813 
WUUS54 KSHV 280815
SVRSHV
LAC013-015-017-027-031-049-061-069-073-081-111-119-280915-
/O.NEW.KSHV.SV.W.0159.210528T0815Z-210528T0915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
315 AM CDT Fri May 28 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Southeastern Webster Parish in northwestern Louisiana...
  Northwestern Jackson Parish in north central Louisiana...
  North central De Soto Parish in northwestern Louisiana...
  Northern Red River Parish in northwestern Louisiana...
  Union Parish in north central Louisiana...
  North central Natchitoches Parish in northwestern Louisiana...
  Northwestern Ouachita Parish in north central Louisiana...
  Southeastern Caddo Parish in northwestern Louisiana...
  Eastern Claiborne Parish in northwestern Louisiana...
  Bienville Parish in northwestern Louisiana...
  Southeastern Bossier Parish in northwestern Louisiana...
  Lincoln Parish in north central Louisiana...

* Until 415 AM CDT.

* At 314 AM CDT, severe thunderstorms were located along a line
  extending from Junction City to near Gibsland to 9 miles east of
  Stonewall, moving east at 50 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Ruston, Grambling, Farmerville, Arcadia, Bernice, Ringgold,
  Gibsland, Heflin, Cooley, Dubach, Choudrant, Simsboro, Marion,
  Martin, Junction City, Vienna, Hall Summit, Saline, Lucky and
  Ashland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground 
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3300 9208 3249 9244 3206 9317 3220 9377
      3259 9306 3301 9278
TIME...MOT...LOC 0814Z 286DEG 41KT 3302 9273 3258 9301 3223 9365 

HAIL...0.75IN
WIND...60MPH
 
$$

24

2 follow-up statements

076 
WWUS54 KSHV 280838
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
338 AM CDT Fri May 28 2021

LAC013-015-017-027-031-049-061-069-073-081-111-119-280915-
/O.CON.KSHV.SV.W.0159.000000T0000Z-210528T0915Z/
Webster LA-Jackson LA-De Soto LA-Red River LA-Union LA-
Natchitoches LA-Ouachita LA-Caddo LA-Claiborne LA-Bienville LA-
Bossier LA-Lincoln LA-
338 AM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR SOUTHEASTERN WEBSTER...NORTHWESTERN JACKSON...CENTRAL DE SOTO...
NORTHERN RED RIVER...UNION...NORTH CENTRAL NATCHITOCHES...
NORTHWESTERN OUACHITA...SOUTHEASTERN CADDO...SOUTHEASTERN
CLAIBORNE...BIENVILLE...SOUTHEASTERN BOSSIER AND LINCOLN PARISHES...

At 337 AM CDT, severe thunderstorms were located along a line
extending from 9 miles northeast of Cooley to near Grambling to 11
miles northwest of Coushatta, moving east at 45 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Ruston, Grambling, Farmerville, Arcadia, Bernice, Ringgold, Cooley,
Dubach, Choudrant, Simsboro, Marion, Martin, Vienna, Hall Summit,
Saline, Lucky, Ashland, Castor, Bienville and Lisbon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3300 9208 3249 9244 3206 9317 3217 9359
      3256 9299 3301 9269
TIME...MOT...LOC 0837Z 286DEG 41KT 3296 9250 3252 9278 3218 9342 

HAIL...0.75IN
WIND...60MPH
 
$$

24

978 
WWUS54 KSHV 280848
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
348 AM CDT Fri May 28 2021

LAC015-017-027-031-119-280857-
/O.CAN.KSHV.SV.W.0159.000000T0000Z-210528T0915Z/
Webster LA-De Soto LA-Caddo LA-Claiborne LA-Bossier LA-
348 AM CDT Fri May 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WEBSTER...CENTRAL
DE SOTO...SOUTHEASTERN CADDO...SOUTHEASTERN CLAIBORNE AND
SOUTHEASTERN BOSSIER PARISHES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3300 9208 3249 9244 3206 9317 3214 9344
      3252 9286 3300 9251
TIME...MOT...LOC 0847Z 286DEG 41KT 3294 9242 3250 9270 3216 9334 

$$

LAC013-049-061-069-073-081-111-280915-
/O.CON.KSHV.SV.W.0159.000000T0000Z-210528T0915Z/
Jackson LA-Red River LA-Union LA-Natchitoches LA-Ouachita LA-
Bienville LA-Lincoln LA-
348 AM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR NORTHWESTERN JACKSON...NORTHEASTERN RED RIVER...CENTRAL UNION...
NORTH CENTRAL NATCHITOCHES...NORTHWESTERN OUACHITA...SOUTHEASTERN
BIENVILLE AND LINCOLN PARISHES...

At 347 AM CDT, severe thunderstorms were located along a line
extending from 11 miles north of Farmerville to Grambling to 9 miles
north of Coushatta, moving east at 45 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Ruston, Grambling, Farmerville, Dubach, Choudrant, Simsboro, Marion,
Martin, Vienna, Hall Summit, Saline, Lucky, Ashland, Castor,
Bienville, Quitman, Downsville, Bryceland, D Arbonne and Brice.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3300 9208 3249 9244 3206 9317 3214 9344
      3252 9286 3300 9251
TIME...MOT...LOC 0847Z 286DEG 41KT 3294 9242 3250 9270 3216 9334 

HAIL...0.75IN
WIND...60MPH
 
$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 1:46 AM CDT	Special Weather Statement	SHV	Bossier, Caddo	44 min
May 28, 2:34 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more	41 min
May 28, 3:22 AM CDT	Special Weather Statement	SHV	De Soto, Red River	38 min
May 28, 4:00 AM CDT	Special Weather Statement	SHV	Jackson, Ouachita	45 min
May 28, 10:03 AM CDT	River Flood Warning	SHV	Bienville, Bossier, Webster	21 days

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.