Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 191, NWS Shreveport, LA

September 2, 2021Sabine County, Shelby County, Texas; De Soto Parish, Sabine Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Sep 2, 2021, 3:49 PM CDT for Sabine County, Shelby County, Texas; De Soto Parish, Sabine Parish, Louisiana. It was in force for 25 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: Sep 2, 2021, 3:49 PM CDT (20:49 UTC)
Expired: Sep 2, 2021, 4:14 PM CDT
In force: 25 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties De Soto Parish, LA, Sabine Parish, LA, Sabine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 80 km from the middle of the area, began a volume at 20:50 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, 8.8 hours before the alert went out and 82 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: 1908 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

758 
WUUS54 KSHV 022049
SVRSHV
LAC031-085-TXC403-419-022130-
/O.NEW.KSHV.SV.W.0191.210902T2049Z-210902T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
349 PM CDT Thu Sep 2 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  South central De Soto Parish in northwestern Louisiana...
  Northwestern Sabine Parish in northwestern Louisiana...
  Southeastern Shelby County in eastern Texas...
  North central Sabine County in eastern Texas...

* Until 430 PM CDT.

* At 349 PM CDT, severe thunderstorms were located along a line
  extending from 16 miles southeast of Mansfield to 7 miles southeast
  of Converse to near Zwolle, moving west at 10 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Milam, Many, Zwolle, Converse, Oak Grove, Pleasant Hill, Huxley,
  Noble, Pelican, Toledo Bend Reservoir North and Belmont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3194 9379 3173 9387 3148 9381 3152 9348
      3172 9349 3188 9347
TIME...MOT...LOC 2049Z 094DEG 10KT 3182 9356 3173 9359 3160 9357 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

44

1 follow-up statement

100 
WWUS54 KSHV 022114
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
414 PM CDT Thu Sep 2 2021

LAC031-085-TXC403-419-022124-
/O.CAN.KSHV.SV.W.0191.000000T0000Z-210902T2130Z/
De Soto LA-Sabine LA-Shelby TX-Sabine TX-
414 PM CDT Thu Sep 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL DE SOTO AND
NORTHWESTERN SABINE PARISHES...SOUTHEASTERN SHELBY AND NORTH CENTRAL
SABINE COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3194 9379 3173 9387 3148 9381 3152 9348
      3172 9349 3188 9347
TIME...MOT...LOC 2111Z 094DEG 10KT 3182 9363 3173 9366 3160 9364 

$$

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 1:50 AM CDT	Special Weather Statement	SHV	Cass	25 min
Sep 2, 3:13 AM CDT	Heat Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	16 hr
Sep 2, 3:13 AM CDT	Special Weather Statement	SHV	Bowie	47 min
Sep 1, 7:22 PM CDT	Special Weather Statement	SHV	Bossier, Webster	38 min
Sep 1, 7:35 PM CDT	Special Weather Statement	SHV	Ouachita	40 min
Sep 1, 7:57 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	41 min
Sep 1, 8:09 PM CDT	Special Weather Statement	SHV	Caldwell	51 min
Sep 1, 8:38 PM CDT	Special Weather Statement	SHV	Bossier	52 min

Nearby

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