Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 201, NWS Shreveport, LA

October 27, 2021Shelby County, Texas; 5 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Oct 27, 2021, 11:06 AM CDT for Shelby County, Texas; 5 parishes in Louisiana. It was in force for 39 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
Oct 27, 2021, 11:06 AM CDT (16:06 UTC)
Expired
Oct 27, 2021, 11:45 AM CDT
In force
39 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Shelby County, TX

The radar

The Shreveport radar (KSHV), 46 km from the middle of the area, began a volume at 16:07 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Oct 27, 10:08 AM CDTTornado WatchSPC5 hr
Oct 27, 7:55 AM CDTTornado WatchSPC9 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 4.1 hours before the alert went out and 47 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 2021-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 395 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.19395878Sfc1 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
395 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

719 
WUUS54 KSHV 271606
SVRSHV
LAC015-017-031-081-085-TXC419-271645-
/O.NEW.KSHV.SV.W.0201.211027T1606Z-211027T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1106 AM CDT Wed Oct 27 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  De Soto Parish in northwestern Louisiana...
  Northwestern Red River Parish in northwestern Louisiana...
  Southern Caddo Parish in northwestern Louisiana...
  South central Bossier Parish in northwestern Louisiana...
  Northwestern Sabine Parish in northwestern Louisiana...
  Eastern Shelby County in eastern Texas...

* Until 1145 AM CDT.

* At 1105 AM CDT, severe thunderstorms were located along a line
  extending from 7 miles south of Greenwood to near Logansport to
  near Patroon, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Shreveport, Mansfield, Stonewall, Zwolle, Converse, Oak Grove,
  Pleasant Hill, Huxley, South Mansfield, Keachi, Noble, Grand Cane,
  Longstreet, Stanley, Keat Chie, Carmel, Grand Bayou, Belmont,
  Kingston and Pelican.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 PM CDT for northwestern
Louisiana. A Tornado Watch also remains in effect until 400 PM CDT
for northwestern Louisiana...and eastern Texas.

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

If on or near a lake, get away from the water and move indoors or 
inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

A Tornado Watch remains in effect until 400 PM CDT for northwestern
Louisiana. A Tornado Watch also remains in effect until 400 PM CDT
for northwestern Louisiana...and eastern Texas.

&&

LAT...LON 3242 9348 3203 9346 3165 9344 3161 9394
      3200 9397 3229 9402
TIME...MOT...LOC 1605Z 266DEG 27KT 3233 9400 3201 9393 3161 9391 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

16

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 27, 7:19 AM CDTSpecial Weather StatementSHVSmith, Wood26 min
Oct 27, 8:38 AM CDTSpecial Weather StatementSHVAngelina, Nacogdoches52 min
Oct 27, 9:24 AM CDTSpecial Weather StatementSHVRusk36 min
Oct 27, 9:31 AM CDTSpecial Weather StatementSHVAngelina, Nacogdoches, San Augustine, Shelby59 min
Oct 27, 9:41 AM CDTSpecial Weather StatementSHVCass, Gregg, Harrison, Marion, Morris, Titus64 min
Oct 27, 9:53 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Panola, Rusk52 min
Oct 27, 10:01 AM CDTTornado WarningSHVHarrison29 min
Oct 27, 10:08 AM CDTSpecial Weather StatementSHVPanola67 min
Oct 27, 10:28 AM CDTSpecial Weather StatementSHVSabine, San Augustine, Shelby62 min
Oct 27, 10:44 AM CDTSevere Thunderstorm WarningSHVCass, Harrison, Marion, Panola46 min
Oct 27, 10:47 AM CDTSpecial Weather StatementSHVBowie, Cass58 min
Oct 27, 3:07 PM CDTLake Wind AdvisorySHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more52 hr
Oct 27, 3:07 PM CDTWind AdvisorySHVAngelina, Camp, Cherokee, Franklin, Gregg, Morris and 7 more28 hr
Oct 27, 11:30 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo45 min
Oct 27, 11:36 AM CDTSpecial Weather StatementSHVSabine54 min
Oct 27, 11:40 AM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more65 min
Oct 27, 12:11 PM CDTSpecial Weather StatementSHVGrant, LaSalle64 min
Oct 27, 12:12 PM CDTSpecial Weather StatementSHVBossier, Webster63 min
Oct 27, 12:29 PM CDTSevere Thunderstorm WarningSHVGrant, Natchitoches, Sabine, Winn61 min
Oct 27, 12:42 PM CDTSpecial Weather StatementSHVBienville, Jackson, Lincoln63 min
Oct 27, 1:15 PM CDTSpecial Weather StatementSHVCaldwell, Grant, LaSalle, Winn60 min
Oct 27, 1:31 PM CDTSpecial Weather StatementSHVGrant44 min
Oct 27, 1:39 PM CDTSevere Thunderstorm WarningSHVCaldwell, Grant, LaSalle, Winn66 min
Oct 27, 2:16 PM CDTSpecial Weather StatementSHVCaldwell, Ouachita29 min
Oct 27, 2:43 PM CDTSpecial Weather StatementSHVCaldwell, Ouachita47 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021Severe 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.