Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 180, NWS Shreveport, LA

July 29, 2018Caldwell Parish, Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 29, 2018, 4:51 PM CDT for Caldwell Parish, Grant Parish, LaSalle Parish, Louisiana. It was in force for 54 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 29, 2018, 4:51 PM CDT (21:51 UTC)
Expired
Jul 29, 2018, 5:45 PM CDT
In force
54 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Caldwell Parish, LA, Grant Parish, LA, LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 97 km from the middle of the area, began a volume at 21:54 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

Shreveport, LA (KBAD), launched 12:00Z, 9.9 hours before the alert went out and 158 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 2018-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 662 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, Shreveport, LA at 12:00Z on 2018-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
662 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
1046 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
111 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 29, 4:42 PM CDT, 9 minutes earlier.

Area forecast discussion, Jul 29, 4:42 PM CDT, 9 minutes before
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Hazardous weather outlook, Jul 29, 11:53 AM CDT, 4 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
1153 AM CDT Sun Jul 29 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>167-301700-
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-
1153 AM CDT Sun Jul 29 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...

A band of developing showers and thunderstorms was slowly
advancing southward across the Interstate 30 corridor. With
daytime heating these storms will likely intensify, with periods
of heavy rainfall possible, in addition to frequent deadly
lightning and strong gusty winds with stronger storms as they
continue to move southward across the Interstate 20 corridor later
this afternoon and into at least the early evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

Showers and thunderstorms will become numerous late in the day
Monday but especially Monday Night into early Tuesday as an upper
level trough moves into our region from the north and west. Again,
some of these storms could be strong with isolated severe
thunderstorms also possible as a cold front moves into the
region. Locally heavy rainfall, frequent deadly lightning, and
very strong gusty winds can be expected in stronger storms. Thunderstorms
should end across Northeast and East Central Louisiana by Tuesday
Evening with milder temperatures and drier weather by the middle
of the upcoming work week. Temperatures will moderate by the end
of the work week into the upcoming weekend with a return to widely
scattered afternoon and evening thunderstorms.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters are not anticipated later this
afternoon or evening but isolated strong to severe thunderstorms
will be possible later this afternoon and evening.

07

In the hours before

Local storm report, Jul 29, 3:17 PM CDT, 1 hour 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
317 PM CDT SUN JUL 29 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0235 PM     TSTM WND DMG     HAUGHTON                32.53N 93.50W
07/29/2018                   BOSSIER            LA   LAW ENFORCEMENT

            TREES AND LIMBS DOWN IN, AND AROUND,
            HAUGHTON. SWEPCO IS REPORTING POWER OUTAGES
            IN THE CITY AS WELL.

&&

ABD
Local storm report, Jul 29, 3:19 PM CDT, 1 hour 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
319 PM CDT SUN JUL 29 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0218 PM     TSTM WND DMG     BENTON                  32.70N 93.74W
07/29/2018                   BOSSIER            LA   LAW ENFORCEMENT

            TREES AND LIMBS DOWN IN THE BENTON AREA.

&&

ABD
Special weather statement, Jul 29, 3:24 PM CDT, 1 hour 27 minutes before
Special Weather Statement
National Weather Service Shreveport LA
324 PM CDT SUN JUL 29 2018

LAZ001-002-010>012-017-018-TXZ151-153-166-167-292115-
De Soto LA-Bossier LA-Bienville LA-Natchitoches LA-Red River LA-
Caddo LA-Sabine LA-Sabine TX-Panola TX-San Augustine TX-Shelby TX-
324 PM CDT SUN JUL 29 2018

...SIGNIFICANT WEATHER ADVISORY FOR DE SOTO...RED RIVER...WEST
CENTRAL NATCHITOCHES...SOUTHEASTERN CADDO...WEST CENTRAL BIENVILLE...
SOUTHEASTERN BOSSIER AND NORTHERN SABINE PARISHES...SOUTHEASTERN
PANOLA...SHELBY...NORTHEASTERN SAN AUGUSTINE AND NORTHWESTERN SABINE
COUNTIES UNTIL 415 PM CDT...

At 321 PM CDT, Doppler radar was tracking a strong thunderstorm 13
miles east of Converse. Additional scattered strong storms
developing along a fast moving outflow boundary moving south across
the area. The storms were  moving south at 25 mph.

Winds in excess of 40 mph will be possible with these storms and
outflow boundary.

Locations impacted include...
Center, Mansfield, Milam, Many, San Augustine, Coushatta, Stonewall,
Zwolle, Logansport, Tenaha, Timpson, Joaquin, Converse, Shelbyville,
Patroon, Bland Lake, Neuville, Allen, Oak Grove and Pleasant Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Shreveport.

&&

LAT...LON 3215 9408 3239 9336 3169 9317 3152 9356
      3142 9399 3191 9448
TIME...MOT...LOC 2021Z 347DEG 5KT 3182 9348

07
Local storm report, Jul 29, 3:44 PM CDT, 1 hour 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
344 PM CDT SUN JUL 29 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0221 PM     TSTM WND DMG     HOMER                   32.79N 93.05W
07/29/2018                   CLAIBORNE          LA   LAW ENFORCEMENT

            LARGE TREE DOWN IN HOMER.

&&

ABD
Local storm report, Jul 29, 3:57 PM CDT, 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
357 PM CDT SUN JUL 29 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0310 PM     TSTM WND DMG     STONEWALL               32.27N 93.82W
07/29/2018                   DE SOTO            LA   LAW ENFORCEMENT

            REPORTS OF TWO TREES DOWN IN STONEWALL.

&&

ABD
Special weather statement, Jul 29, 4:20 PM CDT, 31 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 12:36 PM CDTSpecial Weather StatementSHVWood54 min
Jul 29, 12:40 PM CDTSpecial Weather StatementSHVCass50 min
Jul 29, 1:13 PM CDTSevere Thunderstorm WarningSHVCass, Marion62 min
Jul 29, 2:41 PM CDTSpecial Weather StatementSHVHarrison, Panola64 min
Jul 29, 3:24 PM CDTSpecial Weather StatementSHVShelby51 min
Jul 29, 4:08 PM CDTSevere Thunderstorm WarningSHVNacogdoches, Rusk, Sabine, San Augustine, Shelby52 min
Jul 29, 5:07 PM CDTSpecial Weather StatementSHVSan Augustine53 min
Jul 29, 5:47 PM CDTSpecial Weather StatementSHVAngelina43 min
Jul 29, 1:35 PM CDTSevere Thunderstorm WarningSHVBossier, Claiborne, Webster40 min
Jul 29, 1:59 PM CDTSpecial Weather StatementSHVCaddo61 min
Jul 29, 2:06 PM CDTSevere Thunderstorm WarningSHVBossier39 min
Jul 29, 2:21 PM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Caddo, De Soto, Red River39 min
Jul 29, 2:38 PM CDTSpecial Weather StatementSHVBienville, Jackson, Lincoln, Ouachita, Union67 min
Jul 29, 3:06 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo, De Soto, Red River39 min
Jul 29, 3:32 PM CDTSevere Thunderstorm WarningSHVLincoln, Ouachita, Union43 min
Jul 29, 3:46 PM CDTSevere Thunderstorm WarningSHVDe Soto, Grant, Jackson, Natchitoches, Red River, Sabine and 1 more59 min
Jul 29, 4:20 PM CDTSpecial Weather StatementSHVCaldwell, Ouachita55 min
Jul 29, 4:29 PM CDTSevere Thunderstorm WarningSHVCaldwell, Ouachita, Union61 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.