Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 144, NWS Shreveport, LA

May 10, 20214 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 10, 2021, 4:56 PM CDT for 4 parishes in Louisiana. It was in force for 53 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 10, 2021, 4:56 PM CDT (21:56 UTC)
Expired: May 10, 2021, 5:49 PM CDT
In force: 53 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Bienville Parish, LA, Jackson Parish, LA, Natchitoches Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 104 km from the middle of the area, began a volume at 21:57 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 10, 5:00 PM CDT	TSTM WND DMG	2 E Goldonna, LA	TREE DOWN ON HWY 1233 BRINGING DOWN POWER LINES NEAR GOLDONNA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.9 hours before the alert went out and 133 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: 257 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

985 
WUUS54 KSHV 102156
SVRSHV
LAC013-049-069-127-102300-
/O.NEW.KSHV.SV.W.0144.210510T2156Z-210510T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
456 PM CDT Mon May 10 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Jackson Parish in north central Louisiana...
  Northeastern Natchitoches Parish in northwestern Louisiana...
  Southeastern Bienville Parish in northwestern Louisiana...
  Winn Parish in north central Louisiana...

* Until 600 PM CDT.

* At 455 PM CDT, a severe thunderstorm was located 16 miles southwest
  of Jonesboro, moving east at 40 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Winnfield, Jonesboro, Campti, Chatham, Hodge, Goldonna, North
  Hodge, Dodson, East Hodge, Saline, Lucky, Ashland, Calvin,
  Bienville, Quitman, Sikes, Brice, Friendship, Joyce and Liberty
  Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3189 9233 3186 9232 3185 9234 3182 9234
      3181 9236 3180 9236 3189 9314 3240 9304
      3236 9236 3232 9231 3190 9231
TIME...MOT...LOC 2155Z 283DEG 33KT 3210 9295 

HAIL...1.25IN
WIND...60MPH
 
$$

19

3 follow-up statements

114 
WWUS54 KSHV 102217
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
517 PM CDT Mon May 10 2021

LAC013-049-069-127-102300-
/O.CON.KSHV.SV.W.0144.000000T0000Z-210510T2300Z/
Jackson LA-Natchitoches LA-Bienville LA-Winn LA-
517 PM CDT Mon May 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHERN JACKSON...NORTHEASTERN NATCHITOCHES...SOUTHEASTERN
BIENVILLE AND WINN PARISHES...

At 517 PM CDT, a severe thunderstorm was located 10 miles northwest
of Winnfield, moving east at 40 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Winnfield, Jonesboro, Chatham, Hodge, Goldonna, North Hodge, Dodson,
East Hodge, Calvin, Sikes, Hudson, Friendship and Joyce.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3189 9233 3186 9232 3185 9234 3182 9234
      3181 9236 3180 9236 3187 9299 3232 9286
      3232 9231 3190 9231
TIME...MOT...LOC 2217Z 283DEG 33KT 3205 9271 

HAIL...1.25IN
WIND...60MPH
 
$$

19

518 
WWUS54 KSHV 102233
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
533 PM CDT Mon May 10 2021

LAC013-049-069-102242-
/O.CAN.KSHV.SV.W.0144.000000T0000Z-210510T2300Z/
Jackson LA-Natchitoches LA-Bienville LA-
533 PM CDT Mon May 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN JACKSON...
NORTHEASTERN NATCHITOCHES AND SOUTHEASTERN BIENVILLE PARISHES IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3189 9233 3186 9232 3185 9234 3182 9234
      3181 9236 3180 9236 3185 9280 3215 9271
      3215 9231 3190 9231
TIME...MOT...LOC 2232Z 283DEG 33KT 3202 9254 

$$

LAC127-102300-
/O.CON.KSHV.SV.W.0144.000000T0000Z-210510T2300Z/
Winn LA-
533 PM CDT Mon May 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR WINN PARISH...

At 532 PM CDT, a severe thunderstorm was located 8 miles northeast of
Winnfield, moving east at 40 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Winnfield, Dodson, Calvin, Sikes, Joyce and Hudson. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3189 9233 3186 9232 3185 9234 3182 9234
      3181 9236 3180 9236 3185 9280 3215 9271
      3215 9231 3190 9231
TIME...MOT...LOC 2232Z 283DEG 33KT 3202 9254 

HAIL...1.25IN
WIND...60MPH
 
$$

19

467 
WWUS54 KSHV 102249
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
549 PM CDT Mon May 10 2021

LAC127-102256-
/O.CAN.KSHV.SV.W.0144.000000T0000Z-210510T2300Z/
Winn LA-
549 PM CDT Mon May 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR WINN PARISH IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3189 9233 3186 9232 3185 9234 3182 9234
      3181 9236 3180 9236 3185 9280 3215 9271
      3215 9231 3190 9231
TIME...MOT...LOC 2243Z 283DEG 33KT 3199 9239 

$$

19

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 10, 3:31 PM CDT, 1 hour 25 minutes earlier.

Area forecast discussion, May 10, 3:31 PM CDT, 1 hour 25 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
331 PM CDT Mon May 10 2021

.SHORT TERM.../Tonight through Tuesday Night/

Sct svr elevated convection continues to build SE into extreme NW
LA attm, riding along an area of higher MUCapes of 1000-2000 J/Kg
coinciding with the lingering H850 trough over the Red River
Valley of Srn OK/N TX into the Nrn sections of SW AR, where steep
lapse rates persist ahead of weak perturbations in the nearly
zonal flow. The 12Z CAMs, which somewhat initialized on this
convection this AM, suggest that it will weaken late this
afternoon/early evening, although additional convection
redevelopment is expected later this evening and overnight across
NE TX/SE OK/SW AR/possibly extreme Nrn LA, with the approach of
another perturbation in the flow that will interact with
increasing convergence along the H925 trough as it begins to lift
back N across E TX/NW LA into SW AR. Thus, have stairstepped pops
back from chance to likely across E TX/SW AR by late evening,
before likely expanding pops farther E across the remainder of SW
AR overnight. Fortunately, these areas will be able to take the
rain tonight, with the weak cold front now over the Srn sections
of NCntrl LA into Deep E TX now expected to be much of a player
tonight as it should seep just S of the area this evening.

While there may be a brief lull in the extent of convection
Tuesday morning, weak sfc low development along the lingering sfc
frontal bndry just to our S may result in the bndry nudging back N
a tad into Deep E TX and Cntrl LA from the late morning and a
portion of the afternoon. This will occur as the upper trough
now swinging through the Great Basin into the Rockies ejects into
the Plains and dampens Tuesday, although this trough will advect
Pacific moisture NE ahead of the Baja upper trough and become
absorbed into the Nrn stream trough into the Srn Plains/Lower MS
Valley Tuesday. This will set the stage for convection becoming
more numerous by late morning and especially for the afternoon
areawide. While the setup is not typical for the transitional
heavy rainfall events, am concerned though of the proximity of the
sfc bndry to our S over areas that remain saturated in wake of
widespread heavy rainfall (3-7+ inches) and flooding that
occurred Sunday afternoon/evening over Deep E TX/WCntrl LA. Have
deferred a Flash Flood Watch for this area for the graveyard
shift later tonight, with the greatest threat for moderate to
potentially heavy rainfall over this area likely being late
Tuesday morning through Wednesday afternoon. Confidence is high
though such that pops have been increased to high end categorical
areawide Tuesday afternoon, before mid and upper level drier air
begins to entrain SE into NE TX/SE OK/SW AR Tuesday night. Thus,
rain rates will begin to taper off from NW to SE Tuesday night as
the aforementioned trough axis moves through the Srn Plains into
the Lower MS Valley. Did continue to undercut the NBM max temps
over much of the area Tuesday, as little warming will occur over
the cool sector with the increasing convection.

15

&&

.LONG TERM.../Wednesday through Monday Night/

By Wednesday, showers and thunderstorms will be ongoing along a
stalled 850mb front. With moderate to heavy rainfall expected
previous to this, some flooding issues could remain during this
time.  However, by Wednesday afternoon, another trough will move
through the midwest.  This will push the 850mb front through the
region, and rain chances will diminish from north to south.
Northwest flow will bring in drier weather for Thursday along with
slightly below normal temps.  Look for this dry weather to continue
on Friday and Saturday as upper ridging builds into the region, but
a slight warm-up in temperatures will start during this period and
continue through early next week. The ridge starts to break down
late into the weekend and the flow will become more zonal. Rain
chances will return for Sunday and the first part of next week as
disturbances move across the region along the flow. /20/

&&

.PREV DISCUSSION... /issued 1251 PM CDT Mon May 10 2021/

AVIATION...
IFR with occasional LIFR cigs will persist through much of the 18Z
TAF period across much of E TX/N LA, while some slightly drier
air backdooring SW will maintain low MVFR cigs across SW AR this
afternoon and evening, before they diminish to IFR late tonight.
Sct strong/svr convection continues to develop/slide SE into NE
TX, but should stay N of the TYR/GGG terminals, but possible
affect TXK/SHV by mid to late afternoon. Additional convection may
develop farther E across Srn AR before diminishing by early
evening. A weak cold front will also seep S into Deep E TX/NCntrl
LA this afternoon, possibly sliding S of the area this evening
although it may waffle back N a tad Tuesday morning. Sct
convection is expected to redevelop by mid to late evening across
NE TX/SE OK/SW AR and possibly NW LA, affecting all terminals
except LFK. This convection will result in IFR cigs redeveloping
across SW AR late this evening/overnight, even as the convection
diminishes from W to E by/after daybreak. However, additional
convection will develop by mid to late morning across E TX, which
will shift E and become numerous by midday through the afternoon
Tuesday, maintaining IFR and reduced vsbys over much of the
region. NE winds around 10kts this afternoon will only diminish
slightly to 5-8kts after 00Z. /15/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  59  65  57  67 /  60  90  90  50
MLU  59  67  59  68 /  50  90  90  60
DEQ  54  59  52  67 /  60  90  60  20
TXK  56  59  53  67 /  70  90  80  30
ELD  54  62  53  68 /  70  90  80  40
TYR  59  64  56  68 /  70  90  80  40
GGG  58  64  56  66 /  60  90  90  40
LFK  67  78  62  68 /  40  90  90  60

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...None.
LA...None.
OK...None.
TX...None.
&&

15/20

Hazardous weather outlook, May 10, 1:55 PM CDT, 3 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Shreveport LA
155 PM CDT Mon May 10 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-111900-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-
Grant-Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
155 PM CDT Mon May 10 2021

This Hazardous Weather Outlook is for portions of south central
Arkansas, southwest Arkansas, north central Louisiana, northwest
Louisiana, southeast Oklahoma, east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

There is a risk for isolated storms today across portions of the
region today. While widespread severe weather is not expected at
this time, some of the stronger storms may produce large hail,
especially north of the Interstate 20 corridor.  Brief heavy rain
may also result in minor flooding in areas that received heavy
rainfall on yesterday.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

Periods of moderate to heavy rainfall will be possible, especially
Tuesday and Tuesday night, which may lead to localized flooding.
Isolated strong storms also can not be ruled out, with hail and
locally gusty winds possible.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will be needed this afternoon and
evening.

20

In the hours before

Local storm report, May 10, 3:45 PM CDT, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
345 PM CDT MON MAY 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0339 PM     HAIL             3 SE SHREVEPORT         32.41N 93.82W
05/10/2021  E0.88 INCH       CADDO              LA   NWS EMPLOYEE

            RETIRED NWS EMPLOYEE REPORTS NICKEL SIZE
            HAIL 2.5 MILES SOUTH OF THE AIRPORT.

&&

25

Local storm report, May 10, 3:53 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
353 PM CDT MON MAY 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0352 PM     HAIL             9 SE SHREVEPORT         32.36N 93.70W
05/10/2021  M0.50 INCH       CADDO              LA   NWS EMPLOYEE

&&

25

Special weather statement, May 10, 3:54 PM CDT, 1 hour 2 minutes before

Special Weather Statement
National Weather Service Shreveport LA
354 PM CDT Mon May 10 2021

LAZ002>005-012-102200-
Bossier LA-Bienville LA-Lincoln LA-Claiborne LA-Webster LA-
354 PM CDT Mon May 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN WEBSTER...SOUTHERN
CLAIBORNE...NORTHEASTERN BIENVILLE...EAST CENTRAL BOSSIER AND WESTERN
LINCOLN PARISHES UNTIL 500 PM CDT...

At 353 PM CDT, Doppler radar was tracking a strong thunderstorm over
Doyline, or 11 miles southwest of Minden, moving east at 35 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Minden, Haughton, Arcadia, Sibley, Gibsland, Doyline, Dubberly, Dixie
Inn, Heflin, Simsboro, Athens, Lisbon, Bryceland, Mount Lebanon,
Gilark, Noles Landing, Lake Bistineau North, Lake Clairborne, Corinth
and Ogden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3246 9352 3278 9347 3276 9272 3240 9279
TIME...MOT...LOC 2053Z 276DEG 32KT 3254 9346

19

Local storm report, May 10, 4:07 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
407 PM CDT MON MAY 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0405 PM     HAIL             9 SE SHREVEPORT         32.37N 93.71W
05/10/2021  M1.00 INCH       CADDO              LA   PUBLIC

            ELLERBE ROAD ESTATES.

&&

25

Local storm report, May 10, 4:08 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
408 PM CDT MON MAY 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0347 PM     HAIL             3 N BENTON              32.73N 93.74W
05/10/2021  M1.50 INCH       BOSSIER            LA   PUBLIC

            LARGEST HAILSTONE DROPPED IN TACT WAS PING
            PONG SIZED. SEVERE DAMAGE TO VEHICLES.

&&

25

Local storm report, May 10, 4:39 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
439 PM CDT MON MAY 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0343 PM     HAIL             4 SSE BARKSDALE AIR FOR 32.46N 93.65W
05/10/2021  M0.70 INCH       BOSSIER            LA   PUBLIC

            FAA OBSERVER ON LAURIE LANE BOSSIER CITY
            REPORTS HAIL UP TO DIME SIZE.

&&

25

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 7:02 PM CDT	Special Weather Statement	SHV	Grant, Natchitoches	58 min
May 9, 7:17 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	58 min
May 9, 7:22 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Sabine	53 min
May 9, 8:05 PM CDT	Special Weather Statement	SHV	Grant	55 min
May 9, 8:14 PM CDT	Special Weather Statement	SHV	Claiborne, Union	61 min
May 9, 8:15 PM CDT	Special Weather Statement	SHV	Webster	60 min
May 10, 2:25 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	65 min
May 10, 2:53 PM CDT	Special Weather Statement	SHV	Caddo	52 min
May 10, 3:30 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	45 min
May 10, 3:45 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Webster	45 min
May 10, 3:54 PM CDT	Special Weather Statement	SHV	Webster	66 min
May 10, 3:58 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Claiborne, Webster	25 min
May 10, 4:16 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Natchitoches, Red River, Webster and 1 more	44 min
May 10, 5:30 PM CDT	Special Weather Statement	SHV	Grant, LaSalle	60 min
May 10, 6:28 PM CDT	Special Weather Statement	SHV	LaSalle	47 min
May 10, 6:36 PM CDT	Special Weather Statement	SHV	De Soto, Red River	39 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.