Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 134, NWS Shreveport, LA

April 28, 2020Harrison County, Marion County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 28, 2020, 7:46 AM CDT for Harrison County, Marion County, Texas. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 28, 2020, 7:46 AM CDT (12:46 UTC)
Expired
Apr 28, 2020, 8:19 AM CDT
In force
33 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Harrison County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 55 km from the middle of the area, began a volume at 12:50 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.8 hours before the alert went out and 305 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, Lake Charles Mun, LA at 12:00Z on 2020-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1084 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, Lake Charles Mun, LA at 12:00Z on 2020-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 square meters per square second.193958Sfc1 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
1084 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
555 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
253 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

Open this sounding in Storm Lab

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 Apr 28, 6:39 AM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Apr 28, 6:39 AM CDT, 1 hour 7 minutes before
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Hazardous weather outlook, Apr 28, 5:41 AM CDT, 2 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
541 AM CDT Tue Apr 28 2020

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-291100-
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-
541 AM CDT Tue Apr 28 2020

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...Today and Tonight...

Scattered showers and thunderstorms will be possible today across
the region, as a warm front lifts north across the area and an
upper level disturbance progresses east. An isolated severe
weather threat will exist today, with damaging winds and large
hail possible.

However, a complex of showers and thunderstorms will develop
later this afternoon over Central and Northeast Oklahoma, and
quickly shift southeast into Southeast Oklahoma, extreme Northeast
Texas, and Southwest Arkansas by mid evening. Some of these
storms will become severe, with damaging winds, large hail,
and isolated tornadoes possible. Heavy rainfall which may lead to
localized flooding, will be possible as well, with the line of
strong to severe thunderstorms affecting areas along and south of the
Interstate 20 corridor of East Texas and North Louisiana after
midnight. This thunderstorm complex will exit the region prior to
daybreak Wednesday, with the severe threat ending with the
departure of these storms.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

No hazardous weather is expected.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters may be needed today, but will be
needed tonight areawide. Please relay any information about
observed severe weather to the NWS while following all local,
state, and CDC guidelines.

15

In the hours before

Special weather statement, Apr 28, 6:44 AM CDT, 1 hour 2 minutes before
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Special weather statement, Apr 28, 7:24 AM CDT, 22 minutes before
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Special weather statement, Apr 28, 7:31 AM CDT, 15 minutes before
Special Weather Statement
National Weather Service Shreveport LA
731 AM CDT Tue Apr 28 2020

TXZ109>112-125-281315-
Upshur TX-Cass TX-Camp TX-Morris TX-Titus TX-
731 AM CDT Tue Apr 28 2020

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CASS...NORTH CENTRAL
UPSHUR...MORRIS...SOUTHERN TITUS AND CAMP COUNTIES UNTIL 815 AM
CDT...

At 730 AM CDT, Doppler radar was tracking a strong thunderstorm near
Pittsburg, moving east at 30 mph.

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

Locations impacted include...
Mount Pleasant, Pittsburg, Leesburg, Daingerfield, Hughes Springs,
Lone Star, Naples, Omaha, Cason, Cookville, Jenkins, Rocky Branch,
Avinger, Marietta, Rocky Mound, Holly Springs, Roeder, Harvard,
Lafayette and Center Point.

LAT...LON 3289 9512 3319 9505 3326 9446 3290 9450
TIME...MOT...LOC 1230Z 259DEG 25KT 3305 9502

MD

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 6:44 AM CDTSpecial Weather StatementSHVSmith46 min
Apr 28, 7:24 AM CDTSpecial Weather StatementSHVGregg, Harrison51 min
Apr 28, 7:31 AM CDTSpecial Weather StatementSHVCamp, Morris44 min
Apr 28, 8:19 AM CDTAreal Flood AdvisorySHVSmith116 min
Apr 28, 8:38 AM CDTAreal Flood AdvisorySHVGregg, Rusk, Smith2 hr
Apr 28, 8:40 AM CDTAreal Flood AdvisorySHVHarrison2 hr
Apr 28, 8:46 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Panola, Rusk44 min
Apr 28, 9:03 AM CDTSpecial Weather StatementSHVBowie57 min
Apr 28, 9:26 AM CDTSevere Thunderstorm WarningSHVPanola49 min
Apr 28, 9:31 AM CDTSevere Thunderstorm WarningSHVBowie59 min
Apr 28, 9:38 AM CDTRiver Flood WarningSHVFranklin, Morris, Red River, Titus24 hr
Apr 28, 12:11 PM CDTRiver Flood WarningSHVGregg56 hr
Apr 28, 1:53 PM CDTRiver Flood WarningSHVNacogdoches, Rusk54 hr
Apr 28, 1:55 PM CDTRiver Flood WarningSHVSabine, San Augustine54 hr
Apr 28, 2:48 PM CDTSpecial Weather StatementSHVAngelina27 min
Apr 28, 3:00 PM CDTSpecial Weather StatementSHVSabine, San Augustine30 min
Apr 28, 3:25 PM CDTSpecial Weather StatementSHVNacogdoches50 min
Apr 28, 3:37 PM CDTSevere Thunderstorm WarningSHVNacogdoches38 min
Apr 28, 3:57 PM CDTSpecial Weather StatementSHVSan Augustine48 min
Apr 28, 4:01 PM CDTSevere Thunderstorm WarningSHVNacogdoches44 min
Apr 28, 4:19 PM CDTSpecial Weather StatementSHVNacogdoches41 min
Apr 28, 4:35 PM CDTSpecial Weather StatementSHVSan Augustine40 min
Apr 28, 5:05 PM CDTSpecial Weather StatementSHVNacogdoches40 min
Apr 28, 5:21 PM CDTSpecial Weather StatementSHVRusk39 min
Apr 28, 5:26 PM CDTSevere Thunderstorm WarningSHVCherokee, Rusk, Smith64 min
Apr 28, 5:40 PM CDTSpecial Weather StatementSHVNacogdoches50 min
Apr 28, 6:03 PM CDTSpecial Weather StatementSHVRusk42 min
Apr 28, 6:09 PM CDTSpecial Weather StatementSHVRusk51 min
Apr 28, 6:22 PM CDTSevere Thunderstorm WarningSHVCherokee, Rusk, Smith43 min
Apr 28, 8:18 AM CDTSpecial Weather StatementSHVCaddo42 min
Apr 28, 8:37 AM CDTSpecial Weather StatementSHVWebster38 min
Apr 28, 9:32 AM CDTSpecial Weather StatementSHVDe Soto43 min
Apr 28, 9:57 AM CDTSpecial Weather StatementSHVCaddo48 min
Apr 28, 10:15 AM CDTSpecial Weather StatementSHVNatchitoches, Red River45 min
Apr 28, 10:56 AM CDTSpecial Weather StatementSHVNatchitoches, Red River, Winn49 min
Apr 28, 11:09 AM CDTSpecial Weather StatementSHVBienville, Jackson, Lincoln51 min
Apr 28, 11:49 AM CDTSpecial Weather StatementSHVGrant, LaSalle41 min
Apr 28, 12:13 PM CDTAreal Flood AdvisorySHVNatchitoches, Sabine2 hr
Apr 28, 12:16 PM CDTSpecial Weather StatementSHVSabine29 min
Apr 28, 10:48 AM CDTSpecial Weather StatementSHVNevada27 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.