Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

April 23, 2021Grant Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Apr 23, 2021, 7:42 PM CDT for Grant Parish, Louisiana. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 23, 2021, 7:42 PM CDT (00:42 UTC)
Expired
Apr 23, 2021, 8:30 PM CDT
In force
48 min
Issued by
NWS Shreveport, LA

County Grant Parish, LA

The radar

The Ft Polk radar (KPOE), 50 km from the middle of the area, began a volume at 00:43 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 00:00Z, 0.7 hours before the alert went out and 164 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 00:00Z on 2021-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 865 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 00:00Z on 2021-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 383 square meters per square second.1939587897117Sfc1 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
865 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
546 m above ground
0-6 km bulk shear
87 kt
0-1 km storm-relative helicity
383 m²/s²
0-3 km storm-relative helicity
442 m²/s²
Significant tornado parameter
2.4
Supercell composite
10.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 23, 3:21 PM CDT, 4 hours 21 minutes earlier.

Area forecast discussion, Apr 23, 3:21 PM CDT, 4 hours 21 minutes before
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  <meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Hazardous weather outlook, Apr 23, 5:09 AM CDT, 14 hours 33 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
509 AM CDT Fri Apr 23 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-241015-
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-
509 AM CDT Fri Apr 23 2021

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...

Showers and thunderstorms will become widespread this afternoon.
Some storms could be severe from this afternoon through the very
early hours of Saturday morning. Tornadoes, damaging winds, and
large hail will be possible. Locally heavy rainfall could also
lead to flash flooding. The severe weather threat should end a
few hours after midnight with thunderstorms gradually diminishing
through daybreak Saturday morning.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Strong to severe thunderstorms will be possible again Tuesday
afternoon through late Wednesday.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Apr 23, 5:58 PM CDT, 1 hour 44 minutes before
Special Weather Statement
National Weather Service Shreveport LA
558 PM CDT Fri Apr 23 2021

TXZ097-108-109-111-232345-
Bowie TX-Franklin TX-Morris TX-Titus TX-
558 PM CDT Fri Apr 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FRANKLIN...
SOUTHWESTERN BOWIE...NORTHERN MORRIS AND TITUS COUNTIES UNTIL 645 PM
CDT...

At 558 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Wilkerson, or 9 miles northwest of Mount Pleasant,
moving east at 20 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Mount Pleasant, Naples, Omaha, Dalby Springs, Us 259 And I 30
Intersection, Wilkerson, Cookville, Winfield, Talco and Miller's
Cove.

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 3339 9487 3338 9486 3338 9482 3336 9482
      3337 9480 3335 9478 3332 9478 3332 9475
      3340 9475 3341 9468 3314 9468 3313 9517
      3336 9517
TIME...MOT...LOC 2258Z 268DEG 19KT 3328 9508

44
Special weather statement, Apr 23, 7:42 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Shreveport LA
742 PM CDT Fri Apr 23 2021

LAZ018>020-240130-
Winn LA-Natchitoches LA-Grant LA-
742 PM CDT Fri Apr 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GRANT...SOUTHEASTERN
NATCHITOCHES AND SOUTHEASTERN WINN PARISHES UNTIL 830 PM CDT...

At 742 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lena, moving northeast at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Colfax, Montgomery, Dry Prong, Georgetown, Atlanta, Lake Iatt,
Chopin, Aloha and Williana.

A Tornado Watch remains in effect until 900 PM CDT for north central
and northwestern Louisiana.

LAT...LON 3141 9270 3142 9268 3143 9269 3145 9268
      3144 9270 3145 9271 3147 9271 3147 9269
      3152 9272 3148 9276 3141 9287 3146 9296
      3195 9273 3175 9235 3174 9236 3174 9235
      3140 9269
TIME...MOT...LOC 0042Z 210DEG 34KT 3148 9282

44

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 10:18 PM CDTSpecial Weather StatementSHVRed River42 min
Apr 23, 10:22 PM CDTRiver Flood WarningSHVFranklin, Morris, Red River, Titus57 hr
Apr 23, 10:26 PM CDTRiver Flood WarningSHVFranklin, Morris, Titus5 days
Apr 24, 12:31 AM CDTSpecial Weather StatementSHVRed River59 min
Apr 24, 1:06 AM CDTSevere Thunderstorm WarningSHVBowie, Red River39 min
Apr 24, 1:43 AM CDTSevere Thunderstorm WarningSHVBowie62 min
Apr 24, 1:46 AM CDTSpecial Weather StatementSHVCass, Gregg, Harrison, Marion, Upshur44 min
Apr 24, 2:52 AM CDTSpecial Weather StatementSHVPanola38 min
Apr 24, 9:40 AM CDTRiver Flood WarningSHVAngelina, Cherokee, Nacogdoches58 days
Apr 23, 9:26 PM CDTSpecial Weather StatementSHVLaSalle34 min
Apr 24, 2:36 AM CDTSpecial Weather StatementSHVNevada39 min

Nearby

Special Weather Statements in Louisiana, 2021Every special weather statement in 2021

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.