Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

May 11, 2021LaSalle Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at May 11, 2021, 4:38 AM CDT for LaSalle Parish, Louisiana. It was in force for 37 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: May 11, 2021, 4:38 AM CDT (09:38 UTC)
Expired: May 11, 2021, 5:15 AM CDT
In force: 37 min
Issued by: NWS Shreveport, LA

County LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 103 km from the middle of the area, began a volume at 09:42 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 (KSHV), launched 00:00Z, 9.6 hours before the alert went out and 180 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 474 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

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 May 11, 3:05 AM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, May 11, 3:05 AM CDT, 1 hour 33 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, May 11, 3:14 AM CDT, 1 hour 24 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
314 AM CDT Tue May 11 2021

ARZ050-051-059>061-OKZ077-120815-
Sevier-Howard-Little River-Hempstead-Nevada-McCurtain-
314 AM CDT Tue May 11 2021

This Hazardous Weather Outlook is for portions of southwest
Arkansas and southeast Oklahoma.

.DAY ONE...Today and Tonight...

Periods of moderate to heavy rainfall will once again be possible
today and tonight, which may result is some localized flash
flooding. A few of these storms may be strong to severe as well.
Damaging winds and hail would be the primary threats with this
activity.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Dry conditions settle in by Wednesday afternoon, and will remain
into the weekend. Shower and thunderstorm chances return by Sunday
night, with moderate rain possible again into Monday.

.SPOTTER INFORMATION STATEMENT...

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

ARZ070>073-LAZ001>006-010>014-017>022-TXZ096-097-108>112-124>126-
136>138-149>153-165>167-120815-
Miller-Lafayette-Columbia-Union-Caddo-Bossier-Webster-Claiborne-
Lincoln-De Soto-Red River-Bienville-Jackson-Ouachita-Sabine-
Natchitoches-Winn-Grant-Caldwell-La Salle-Bowie-Franklin-Titus-
Camp-Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-
Rusk-Panola-Nacogdoches-Shelby-Angelina-San Augustine-
314 AM CDT Tue May 11 2021

This Hazardous Weather Outlook is for portions of south central
Arkansas, southwest Arkansas, north central Louisiana, northwest
Louisiana, east Texas and northeast Texas.

.DAY ONE...Today and Tonight...

Periods of moderate to heavy rainfall will once again be possible
today and tonight, which may result is some localized flash
flooding. A flash flood watch has been issued for these areas, as
soils are already rather saturated from previous rainfall. A few
of these storms may be strong to severe as well. Damaging winds
and hail would be the primary threats with this activity.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Dry conditions settle in by Wednesday afternoon, and will remain
into the weekend. Shower and thunderstorm chances return by Sunday
night, with moderate rain passable again into Monday.

.SPOTTER INFORMATION STATEMENT...

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

44

In the hours before

Special weather statement, May 11, 1:12 AM CDT, 3 hours 26 minutes before

Special Weather Statement
National Weather Service Shreveport LA
112 AM CDT Tue May 11 2021

TXZ124-136-110700-
Smith TX-Wood TX-
112 AM CDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SMITH AND WOOD
COUNTIES UNTIL 200 AM CDT...

At 112 AM CDT, Doppler radar was tracking a strong thunderstorm near
Grand Saline, or 9 miles west of Mineola, moving east at 40 mph.

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

Locations impacted include...
Mineola, Quitman, Hawkins, Hoard, Hainesville, Golden, Forest Hill
and Alba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3282 9564 3290 9520 3262 9515 3260 9516
      3258 9559 3269 9559 3271 9561 3272 9564
TIME...MOT...LOC 0612Z 264DEG 34KT 3270 9564

33

Special weather statement, May 11, 1:55 AM CDT, 2 hours 43 minutes before

Special Weather Statement
National Weather Service Shreveport LA
155 AM CDT Tue May 11 2021

LAZ020-022-110745-
La Salle LA-Grant LA-
155 AM CDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRANT AND CENTRAL LA
SALLE PARISHES UNTIL 245 AM CDT...

At 155 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Midway, or 19 miles northeast of Pineville, moving
east at 30 mph.

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

Locations impacted include...
Jena, Midway, Nebo, Rogers and Catahoula Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3147 9218 3148 9218 3147 9219 3148 9220
      3145 9234 3163 9238 3177 9201 3149 9201
TIME...MOT...LOC 0655Z 256DEG 24KT 3156 9222

33

Special weather statement, May 11, 2:38 AM CDT, 2 hours before

Special Weather Statement
National Weather Service Shreveport LA
238 AM CDT Tue May 11 2021

TXZ125-137-138-150-110830-
Upshur TX-Gregg TX-Harrison TX-Rusk TX-
238 AM CDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HARRISON...
NORTHEASTERN RUSK...SOUTHEASTERN UPSHUR AND GREGG COUNTIES UNTIL 330
AM CDT...

At 237 AM CDT, Doppler radar was tracking a strong thunderstorm over
White Oak, moving east at 40 mph.

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

Locations impacted include...
Longview, Marshall, Kilgore, White Oak, Gladewater, Hallsville,
Clarksville City, East Mountain, Liberty City, West Mountain,
Lakeport, Easton, Union Grove, Warren City, Nesbitt, Rolling Meadows,
Darco and Judson.

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 3264 9495 3267 9440 3237 9440 3237 9441
      3236 9444 3237 9445 3237 9446 3239 9449
      3236 9449 3235 9450 3237 9495
TIME...MOT...LOC 0737Z 272DEG 36KT 3251 9485

44

Special weather statement, May 11, 3:20 AM CDT, 1 hour 18 minutes before

Special Weather Statement
National Weather Service Shreveport LA
320 AM CDT Tue May 11 2021

TXZ138-110900-
Harrison TX-
320 AM CDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN HARRISON COUNTY UNTIL
400 AM CDT...

At 320 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hallsville, or 7 miles west of Marshall, moving east at 35 mph.

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

Locations impacted include...
Marshall, Waskom, Elysian Fields, Scottsville, Jonesville, Nesbitt,
Darco and Leigh.

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 3259 9456 3265 9408 3238 9408 3236 9419
      3240 9456
TIME...MOT...LOC 0820Z 269DEG 32KT 3250 9447

44

Special weather statement, May 11, 3:37 AM CDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Shreveport LA
337 AM CDT Tue May 11 2021

ARZ050-051-059-060-110930-
Howard AR-Hempstead AR-Sevier AR-Little River AR-
337 AM CDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LITTLE RIVER...WESTERN
HEMPSTEAD...SOUTHERN SEVIER AND SOUTHEASTERN HOWARD COUNTIES UNTIL
430 AM CDT...

At 337 AM CDT, Doppler radar was tracking a strong thunderstorm near
Winthrop, or 7 miles northeast of Foreman, moving east at 40 mph.

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

Locations impacted include...
Ashdown, Mineral Springs, Foreman, Wilton, Tollette, Winthrop, Ben
Lomond, Saratoga, Oak Grove, Bright Star and Browntown.

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 3370 9440 3388 9440 3393 9389 3367 9389
TIME...MOT...LOC 0837Z 269DEG 33KT 3379 9431

44

Special weather statement, May 11, 4:38 AM CDT, 0 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:47 PM CDT	River Flood Warning	SHV	Gregg	64 hr
May 10, 8:41 PM CDT	Special Weather Statement	SHV	Camp, Morris, Upshur, Wood	64 min
May 10, 9:27 PM CDT	Special Weather Statement	SHV	Harrison, Marion	48 min
May 10, 9:29 PM CDT	Severe Thunderstorm Warning	SHV	Red River	46 min
May 11, 12:57 AM CDT	Special Weather Statement	SHV	Smith	48 min
May 11, 1:12 AM CDT	Special Weather Statement	SHV	Wood	48 min
May 11, 2:04 AM CDT	Flash Flood Watch	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	24 hr
May 11, 2:38 AM CDT	Special Weather Statement	SHV	Gregg	52 min
May 11, 3:20 AM CDT	Special Weather Statement	SHV	Harrison	40 min
May 11, 3:28 AM CDT	Areal Flood Advisory	SHV	Harrison	4 hr
May 11, 8:04 AM CDT	River Flood Warning	SHV	Anderson, Cherokee, Houston	36 days
May 11, 9:22 AM CDT	River Flood Warning	SHV	Gregg, Smith, Upshur, Wood	39 days
May 11, 9:25 AM CDT	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	3 days
May 11, 9:25 AM CDT	River Flood Warning	SHV	Franklin, Morris, Titus	5 days
May 11, 11:15 AM CDT	Special Weather Statement	SHV	Cherokee	45 min
May 11, 11:59 AM CDT	Special Weather Statement	SHV	Cherokee	31 min
May 11, 12:31 PM CDT	Special Weather Statement	SHV	Cherokee	44 min
May 11, 1:32 PM CDT	Special Weather Statement	SHV	Smith	43 min
May 11, 1:34 PM CDT	Special Weather Statement	SHV	Gregg	41 min
May 11, 2:12 PM CDT	Special Weather Statement	SHV	Cass, Marion	48 min
May 11, 2:15 PM CDT	Special Weather Statement	SHV	Harrison	45 min
May 11, 2:21 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk, Smith, Upshur	37 min
May 11, 2:50 PM CDT	Special Weather Statement	SHV	Cherokee, Smith	40 min
May 11, 2:56 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Panola, Rusk	17 min
May 11, 3:01 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Rusk, Smith	48 min
May 11, 3:59 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Nacogdoches, Panola, Rusk and 1 more	61 min
May 11, 4:18 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee	42 min
May 11, 5:01 PM CDT	Special Weather Statement	SHV	Angelina	59 min
May 11, 6:00 PM CDT	Special Weather Statement	SHV	Angelina	45 min
May 11, 6:14 PM CDT	Severe Thunderstorm Warning	SHV	Angelina	28 min
May 10, 8:13 PM CDT	Special Weather Statement	SHV	Grant, Natchitoches	47 min
May 10, 11:24 PM CDT	Areal Flood Advisory	SHV	Bossier, Caddo	3 hr
May 11, 1:55 AM CDT	Special Weather Statement	SHV	LaSalle	50 min
May 11, 7:29 AM CDT	Special Weather Statement	SHV	LaSalle	46 min
May 11, 7:39 AM CDT	Special Weather Statement	SHV	De Soto, Sabine	51 min
May 11, 9:25 AM CDT	Special Weather Statement	SHV	Claiborne	35 min
May 11, 3:26 PM CDT	Special Weather Statement	SHV	Caddo	64 min
May 10, 9:56 PM CDT	Severe Thunderstorm Warning	SHV	Sevier	49 min
May 10, 10:11 PM CDT	Special Weather Statement	SHV	Howard	34 min
May 11, 3:37 AM CDT	Special Weather Statement	SHV	Little River	53 min
May 11, 12:04 PM CDT	Special Weather Statement	SHV	Howard	26 min
May 10, 8:59 PM CDT	Special Weather Statement	SHV	McCurtain	46 min
May 10, 9:12 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	38 min
May 11, 1:28 PM CDT	Special Weather Statement	SHV	McCurtain	47 min

Nearby

Special Weather Statements in Louisiana, 2021 Every 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.