Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 169, NWS Shreveport, LA

July 12, 2018Cass County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 12, 2018, 2:29 PM CDT for Cass County, Texas. It was in force for 46 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
Jul 12, 2018, 2:29 PM CDT (19:29 UTC)
Expired
Jul 12, 2018, 3:15 PM CDT
In force
46 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Cass County, TX

The radar

The Shreveport radar (KSHV), 84 km from the middle of the area, began a volume at 19:31 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

Fort Worth, TX (KFWD), launched 12:00Z, 7.5 hours before the alert went out and 276 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, Fort Worth, TX at 12:00Z on 2018-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 522 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, Fort Worth, TX at 12:00Z on 2018-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.1939Sfc1 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
522 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1509 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
-17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 12, 1:48 PM CDT, 41 minutes earlier.

Area forecast discussion, Jul 12, 1:48 PM CDT, 41 minutes before
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Hazardous weather outlook, Jul 12, 11:49 AM CDT, 2 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
1149 AM CDT Thu Jul 12 2018

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-131700-
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-
1149 AM CDT Thu Jul 12 2018

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...

Isolated showers and thunderstorms can be expected during the
morning followed by scattered convection this afternoon. Some of
these thunderstorms will have the potential of becoming strong to
possibly severe, with damaging wind gusts, locally heavy rainfall,
and deadly lightning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

Expect scattered showers and thunderstorms to continue throughout
the remainder of this work week as a series of disturbances
progress from east to west across the Gulf Coast region. Isolated
strong to severe storms with damaging wind gusts, locally heavy
rainfall, and deadly lightning remain possible.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators, and storm spotters will not be required through
tonight.

05

In the hours before

Special weather statement, Jul 12, 12:12 PM CDT, 2 hours 17 minutes before
Special Weather Statement
National Weather Service Shreveport LA
1212 PM CDT THU JUL 12 2018

LAZ001-002-010-011-121800-
De Soto LA-Bossier LA-Red River LA-Caddo LA-
1212 PM CDT THU JUL 12 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL DE SOTO...
NORTHWESTERN RED RIVER...SOUTHEASTERN CADDO AND SOUTH CENTRAL BOSSIER
PARISHES UNTIL 100 PM CDT...

At 1211 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Stonewall, or 11 miles north of Mansfield, moving
north at 10 mph.

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

Locations impacted include...
Shreveport, Stonewall, Frierson, Caspiana, Elm Grove, Robson, Mc
Dade, Kingston and Reeds Store.

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 3211 9358 3212 9379 3239 9384 3237 9350
TIME...MOT...LOC 1711Z 183DEG 8KT 3220 9368

05
Special weather statement, Jul 12, 2:23 PM CDT, 6 minutes before
Special Weather Statement
National Weather Service Shreveport LA
223 PM CDT THU JUL 12 2018

LAZ010-TXZ151-153-122000-
De Soto LA-Panola TX-Shelby TX-
223 PM CDT THU JUL 12 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL DE SOTO PARISH...
SOUTHEASTERN PANOLA AND NORTH CENTRAL SHELBY COUNTIES UNTIL 300 PM
CDT...

At 222 PM CDT, Doppler radar was tracking a strong thunderstorm over
Joaquin, or 16 miles northeast of Center, moving west at 10 mph.

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

Locations impacted include...
Logansport, Tenaha, Joaquin, Woods and Paxton.

LAT...LON 3210 9397 3192 9396 3186 9424 3213 9426
TIME...MOT...LOC 1922Z 086DEG 8KT 3201 9406

05

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 2:23 PM CDTSpecial Weather StatementSHVShelby37 min
Jul 12, 2:51 PM CDTSpecial Weather StatementSHVNacogdoches24 min
Jul 12, 4:02 PM CDTSpecial Weather StatementSHVSmith43 min
Jul 12, 4:24 PM CDTSpecial Weather StatementSHVFranklin, Red River51 min
Jul 12, 4:37 PM CDTSevere Thunderstorm WarningSHVCherokee, Smith53 min
Jul 12, 5:49 PM CDTSpecial Weather StatementSHVSabine41 min
Jul 12, 6:43 PM CDTSpecial Weather StatementSHVSabine32 min
Jul 12, 12:12 PM CDTSpecial Weather StatementSHVDe Soto48 min
Jul 12, 1:10 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo, Webster42 min
Jul 12, 5:09 PM CDTSpecial Weather StatementSHVSabine51 min
Jul 11, 7:01 PM CDTSpecial Weather StatementSHVHoward44 min
Jul 11, 8:41 PM CDTSpecial Weather StatementSHVLittle River34 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018Every severe thunderstorm warning in 2018

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.