Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 209, NWS Shreveport, LA

October 31, 20184 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Oct 31, 2018, 7:02 PM CDT for 4 counties in Texas. It was in force for 58 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: Oct 31, 2018, 7:02 PM CDT (00:02 UTC)
Expired: Oct 31, 2018, 8:00 PM CDT
In force: 58 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Shreveport radar (KSHV), 69 km from the middle of the area, began a volume at 00:03 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.

Issued	Product	Office	Lasted
Oct 31, 3:02 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 0.0 hours before the alert went out and 78 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: 985 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 741 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 311 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.5

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 Oct 31, 6:56 PM CDT, 6 minutes earlier.

Area forecast discussion, Oct 31, 6:56 PM CDT, 6 minutes before

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Hazardous weather outlook, Oct 31, 1:10 PM CDT, 5 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
110 PM CDT Wed Oct 31 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>167-011815-
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-
110 PM CDT Wed Oct 31 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...

Strong to severe thunderstorms will spread southeastward across
the area today and tonight, and damaging winds, large hail, and
isolated tornadoes will be possible with any of the storms,
especially for areas along and south of I 20. The severe weather
threat should gradually diminish from west to east late tonight.

In addition to the severe threat, locally heavy rainfall of one
to three inches with isolated higher amounts will be possible.
This may lead to isolated flash flooding of low lying and poor
drainage areas, and will act to exacerbate ongoing high water on
area rivers and lakes.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

Isolated thunderstorms will be possible Sunday, as another cold
front moves across the region. Yet another storm system will bring
thunderstorms Monday night into Tuesday. However, no organized
hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will be needed this afternoon and
tonight.

20

In the hours before

Special weather statement, Oct 31, 2:31 PM CDT, 4 hours 31 minutes before

Special Weather Statement
National Weather Service Shreveport LA
231 PM CDT WED OCT 31 2018

ARZ050-059-OKZ077-TXZ096-312015-
Sevier AR-Little River AR-McCurtain OK-Red River TX-
231 PM CDT WED OCT 31 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LITTLE RIVER...
NORTHWESTERN SEVIER...SOUTHEASTERN MCCURTAIN AND NORTHEASTERN RED
RIVER COUNTIES UNTIL 315 PM CDT...

At 231 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles northeast of Clarksville, moving northeast at 65 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
De Queen, Horatio, Idabel, Broken Bow, Gillham, Haworth, Garvin,
Eagletown, Moon, Cerrogordo, Hochatown, Goodlake, Goodwater,
Shinewell, Glover, America, West Line, Oak Hill, Golden and Bokhoma.

LAT...LON 3433 9447 3419 9447 3419 9420 3413 9409
      3369 9466 3368 9469 3370 9474 3363 9475
      3359 9480 3370 9510 3446 9470
TIME...MOT...LOC 1931Z 208DEG 56KT 3374 9490

35

Special weather statement, Oct 31, 3:22 PM CDT, 3 hours 40 minutes before

Special Weather Statement
National Weather Service Shreveport LA
322 PM CDT WED OCT 31 2018

ARZ050-051-059-OKZ077-312115-
Howard AR-Sevier AR-Little River AR-McCurtain OK-
322 PM CDT WED OCT 31 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LITTLE RIVER...
SEVIER...CENTRAL HOWARD AND SOUTHEASTERN MCCURTAIN COUNTIES UNTIL 415
PM CDT...

At 321 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Arkinda, or 14 miles west of Foreman, moving northeast
at 35 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
De Queen, Horatio, Lockesburg, Winthrop, Gillham, Arkinda, Oak Grove,
Haworth, Bokhoma, Silver Ridge, Moon, Cerrogordo, Geneva, Central,
Goodwater, Shinewell, Tom, America, Provo and West Line.

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.

&&

A Tornado Watch remains in effect until 1000 PM CDT for southwestern
Arkansas...and southeastern Oklahoma.

LAT...LON 3397 9391 3369 9459 3378 9477 3419 9430
      3419 9425
TIME...MOT...LOC 2021Z 233DEG 29KT 3376 9464

35

Special weather statement, Oct 31, 5:22 PM CDT, 1 hour 40 minutes before

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Special weather statement, Oct 31, 6:07 PM CDT, 55 minutes before

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Special weather statement, Oct 31, 6:35 PM CDT, 27 minutes before

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Local storm report, Oct 31, 6:54 PM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 31, 7:43 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Sabine, San Augustine, Shelby	62 min
Oct 31, 7:56 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion, Panola	64 min
Oct 31, 8:36 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, San Augustine, Shelby	54 min
Nov 1, 4:06 AM CDT	Lake Wind Advisory	SHV	Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 8 more	11 hr
Nov 1, 10:06 AM CDT	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	4 days
Nov 1, 2:01 PM CDT	River Flood Warning	SHV	Wood	3 days
Oct 31, 9:02 PM CDT	Special Weather Statement	SHV	Webster	43 min
Oct 31, 9:30 PM CDT	Special Weather Statement	SHV	Bienville	60 min
Oct 31, 11:51 PM CDT	Tornado Warning Tornado observed	SHV	Grant, LaSalle	39 min
Nov 1, 12:21 AM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	54 min
Nov 1, 12:25 AM CDT	Tornado Warning Tornado observed	SHV	Caldwell, LaSalle	41 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every 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.