Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 131, NWS Shreveport, LA

May 23, 2018Claiborne Parish, Webster Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 23, 2018, 7:24 PM CDT for Claiborne Parish, Webster Parish, Louisiana. It was in force for 51 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: May 23, 2018, 7:24 PM CDT (00:24 UTC)
Expired: May 23, 2018, 8:15 PM CDT
In force: 51 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Claiborne Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 72 km from the middle of the area, began a volume at 00:25 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

Jackson, MS (KJAN), launched 00:00Z, 0.4 hours before the alert went out and 293 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: 1579 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -8 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 May 23, 6:15 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, May 23, 6:15 PM CDT, 1 hour 9 minutes before

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Hazardous weather outlook, May 23, 5:25 AM CDT, 13 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
525 AM CDT Wed May 23 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>167-241100-
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-
525 AM CDT Wed May 23 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...Today and Tonight...

Isolated to scattered thunderstorms will be possible today and
into tonight across the entire Four State Region. The best chances
for thunderstorms will be this afternoon during peak daytime
heating. This activity should slowly decrease through the evening
and nighttime hours. Brief heavy downpours, gusty winds, and
frequent cloud to ground lightning will be the primary threats.
While an isolated storm could become severe, widespread severe
thunderstorms are not expected.

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

Scattered thunderstorms are expected each day from Thursday
through Tuesday. The greatest thunderstorm activity is expected
each afternoon during peak daytime heating, and any storms that
develop will gradually dissipate during the evening. Brief heavy
downpours, gusty winds, and frequent cloud to ground lightning
will be possible, but widespread severe weather is not expected.

A tropical low pressure system moving northward from the Gulf of
Mexico and along the Mississippi River may provide more widespread
and persistent thunderstorm chances across mainly Southern
Arkansas and Northern Louisiana Saturday through Monday.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators, and storm spotters is not anticipated through tonight.

09

In the hours before

Special weather statement, May 23, 4:12 PM CDT, 3 hours 12 minutes before

Special Weather Statement
National Weather Service Shreveport LA
412 PM CDT WED MAY 23 2018

TXZ097-112-232200-
Cass TX-Bowie TX-
412 PM CDT WED MAY 23 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CASS AND
SOUTHEASTERN BOWIE COUNTIES UNTIL 500 PM CDT...

At 412 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Atlanta, moving north at 15 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Atlanta, Queen City, Redwater, Maud, Douglassville and Red Hill.

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.

&&

LAT...LON 3306 9417 3304 9438 3338 9449 3342 9417
TIME...MOT...LOC 2112Z 172DEG 14KT 3313 9429

20

Special weather statement, May 23, 4:15 PM CDT, 3 hours 9 minutes before

Special Weather Statement
National Weather Service Shreveport LA
415 PM CDT WED MAY 23 2018

TXZ108>110-232200-
Camp TX-Franklin TX-Titus TX-
415 PM CDT WED MAY 23 2018

...SIGNIFICANT WEATHER ADVISORY FOR FRANKLIN...WESTERN TITUS AND
WESTERN CAMP COUNTIES UNTIL 500 PM CDT...

At 414 PM CDT, Doppler radar was tracking a strong thunderstorm near
Leesburg, moving north at 15 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Mount Pleasant, Pittsburg, Leesburg, Mount Vernon, Scroggins,
Newsome, Winfield, Miller's Cove, Rocky Mound, Hopewell and
Monticello.

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.

&&

LAT...LON 3336 9499 3295 9498 3293 9515 3300 9515
      3299 9516 3298 9516 3297 9518 3296 9517
      3296 9520 3297 9520 3332 9531 3333 9527
TIME...MOT...LOC 2114Z 172DEG 14KT 3302 9510

20

Special weather statement, May 23, 4:55 PM CDT, 2 hours 29 minutes before

Special Weather Statement
National Weather Service Shreveport LA
455 PM CDT WED MAY 23 2018

LAZ017-018-232245-
Natchitoches LA-Sabine LA-
455 PM CDT WED MAY 23 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NATCHITOCHES AND
CENTRAL SABINE PARISHES UNTIL 545 PM CDT...

At 454 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles southeast of Many, or 16 miles north of Anacoco, moving
northwest at 5 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Many, Zwolle, Converse, Oak Grove, Florien, Provencal, Noble, Fisher,
Robeline, Kisatchie, Mount Carmel, Belmont and Negreet.

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.

&&

LAT...LON 3156 9318 3138 9311 3137 9341 3148 9363
      3183 9380 3183 9356 3170 9344 3169 9321
TIME...MOT...LOC 2154Z 125DEG 6KT 3150 9331

06

Special weather statement, May 23, 6:08 PM CDT, 1 hour 16 minutes before

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Special weather statement, May 23, 6:25 PM CDT, 59 minutes before

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Special weather statement, May 23, 6:49 PM CDT, 35 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
May 23, 8:10 PM CDT	Special Weather Statement	SHV	Red River	50 min
May 23, 8:04 PM CDT	Special Weather Statement	SHV	Jackson, Lincoln	56 min
May 24, 5:16 PM CDT	Special Weather Statement	SHV	Sabine	44 min
May 24, 5:19 PM CDT	Special Weather Statement	SHV	Natchitoches	41 min
May 24, 5:37 PM CDT	Special Weather Statement	SHV	Union	38 min
May 24, 6:05 PM CDT	Special Weather Statement	SHV	Ouachita	40 min
May 23, 7:35 PM CDT	Severe Thunderstorm Warning	SHV	Sevier	55 min
May 23, 7:52 PM CDT	Special Weather Statement	SHV	Hempstead	53 min
May 23, 7:59 PM CDT	Special Weather Statement	SHV	Howard, Sevier	61 min
May 23, 9:16 PM CDT	Special Weather Statement	SHV	Columbia	44 min
May 24, 6:16 PM CDT	Special Weather Statement	SHV	Howard	44 min
May 24, 6:34 PM CDT	Special Weather Statement	SHV	Howard	41 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.