Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 149, NWS Shreveport, LA

May 11, 20214 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 11, 2021, 2:56 PM CDT for 4 counties in Texas. It was in force for 17 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
May 11, 2021, 2:56 PM CDT (19:56 UTC)
Expired
May 11, 2021, 3:13 PM CDT
In force
17 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Gregg County, TX, Harrison County, TX, Panola County, TX, Rusk County, TX

The radar

The Shreveport radar (KSHV), 59 km from the middle of the area, began a volume at 19:58 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 nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.9 hours before the alert went out and 68 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2021-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
605 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
438 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.4

Open this sounding in Storm Lab

The text

As transmitted.

471 
WUUS54 KSHV 111956
SVRSHV
TXC183-203-365-401-112045-
/O.NEW.KSHV.SV.W.0149.210511T1956Z-210511T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
256 PM CDT Tue May 11 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Southern Harrison County in northeastern Texas...
  Northwestern Panola County in northeastern Texas...
  Northeastern Rusk County in northeastern Texas...
  Southeastern Gregg County in northeastern Texas...

* Until 345 PM CDT.

* At 255 PM CDT, a severe thunderstorm was located near Tatum, or 16
  miles southeast of Longview, moving northeast at 25 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...
  Marshall, Tatum, Easton, Scottsville, Chalk Hill, Darco, Stewart
  and Nesbitt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3222 9458 3236 9471 3267 9432 3247 9413
TIME...MOT...LOC 1955Z 231DEG 20KT 3234 9458 

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

19
1 follow-up statement
082 
WWUS54 KSHV 112013
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
313 PM CDT Tue May 11 2021

TXC183-203-365-401-112023-
/O.CAN.KSHV.SV.W.0149.000000T0000Z-210511T2045Z/
Harrison TX-Panola TX-Rusk TX-Gregg TX-
313 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HARRISON...
NORTHWESTERN PANOLA...NORTHEASTERN RUSK AND SOUTHEASTERN GREGG
COUNTIES 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.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern Texas.

LAT...LON 3222 9458 3236 9471 3267 9432 3247 9413
TIME...MOT...LOC 2008Z 231DEG 20KT 3240 9449 

$$

19

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 7:47 PM CDTRiver Flood WarningSHVGregg64 hr
May 10, 8:41 PM CDTSpecial Weather StatementSHVCamp, Morris, Upshur, Wood64 min
May 10, 9:27 PM CDTSpecial Weather StatementSHVHarrison, Marion48 min
May 10, 9:29 PM CDTSevere Thunderstorm WarningSHVRed River46 min
May 11, 12:57 AM CDTSpecial Weather StatementSHVSmith48 min
May 11, 1:12 AM CDTSpecial Weather StatementSHVWood48 min
May 11, 2:04 AM CDTFlash Flood WatchSHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more24 hr
May 11, 2:38 AM CDTSpecial Weather StatementSHVGregg52 min
May 11, 3:20 AM CDTSpecial Weather StatementSHVHarrison40 min
May 11, 3:28 AM CDTAreal Flood AdvisorySHVHarrison4 hr
May 11, 8:04 AM CDTRiver Flood WarningSHVAnderson, Cherokee, Houston36 days
May 11, 9:22 AM CDTRiver Flood WarningSHVGregg, Smith, Upshur, Wood39 days
May 11, 9:25 AM CDTRiver Flood WarningSHVFranklin, Morris, Red River, Titus3 days
May 11, 9:25 AM CDTRiver Flood WarningSHVFranklin, Morris, Titus5 days
May 11, 11:15 AM CDTSpecial Weather StatementSHVCherokee45 min
May 11, 11:59 AM CDTSpecial Weather StatementSHVCherokee31 min
May 11, 12:31 PM CDTSpecial Weather StatementSHVCherokee44 min
May 11, 1:32 PM CDTSpecial Weather StatementSHVSmith43 min
May 11, 1:34 PM CDTSpecial Weather StatementSHVGregg41 min
May 11, 2:12 PM CDTSpecial Weather StatementSHVCass, Marion48 min
May 11, 2:15 PM CDTSpecial Weather StatementSHVHarrison45 min
May 11, 2:21 PM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Rusk, Smith, Upshur37 min
May 11, 2:50 PM CDTSpecial Weather StatementSHVCherokee, Smith40 min
May 11, 3:01 PM CDTSevere Thunderstorm WarningSHVCherokee, Gregg, Rusk, Smith48 min
May 11, 3:59 PM CDTSevere Thunderstorm WarningSHVCherokee, Gregg, Harrison, Nacogdoches, Panola, Rusk and 1 more61 min
May 11, 4:18 PM CDTSevere Thunderstorm WarningSHVAngelina, Cherokee42 min
May 11, 5:01 PM CDTSpecial Weather StatementSHVAngelina59 min
May 11, 6:00 PM CDTSpecial Weather StatementSHVAngelina45 min
May 11, 6:14 PM CDTSevere Thunderstorm WarningSHVAngelina28 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.