Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

November 11, 2021LaSalle Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Nov 11, 2021, 4:36 AM CST for LaSalle Parish, Louisiana. It was in force for 24 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: Nov 11, 2021, 4:36 AM CST (10:36 UTC)
Expired: Nov 11, 2021, 5:00 AM CST
In force: 24 min
Issued by: NWS Shreveport, LA
Hail: 0.00 in
Wind: 40

County LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 100 km from the middle of the area, began a volume at 10:39 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, 10.6 hours before the alert went out and 185 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: 158 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.3

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 Nov 11, 4:22 AM CST, 14 minutes earlier.

Area forecast discussion, Nov 11, 4:22 AM CST, 14 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, Nov 10, 7:09 AM CST, 21 hours 27 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
709 AM CST Wed Nov 10 2021

ARZ050-051-059>061-070>072-LAZ001>003-010-OKZ077-TXZ096-097-
108>112-124>126-136>138-149>153-165-111315-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Caddo-Bossier-Webster-De Soto-McCurtain-Red River-Bowie-
Franklin-Titus-Camp-Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-
Harrison-Cherokee-Rusk-Panola-Nacogdoches-Shelby-Angelina-
709 AM CST Wed Nov 10 2021

This Hazardous Weather Outlook is for portions of southwest
Arkansas, northwest Louisiana, southeast Oklahoma, east Texas and
northeast Texas.

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

Showers and thunderstorms will begin to increase across the area
by late this afternoon through the overnight hours with the next
cold front and associated upper level storm system entering the
region. Although the overall severe weather threat is generally
low, a few severe storms cannot be ruled out along a developing
squall line by late this evening through early Thursday morning.
Damaging winds, large hail, and an isolated tornado will all be
possible through daybreak before the line of storms exits to the
east.

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

Showers and thunderstorms will be ending early Thursday as a cold
front continues advancing across the region. Therefore, the threat
of severe weather is expected to end as well prior to daybreak as
skies gradually clear behind the cold front through the remainder
of Thursday.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators and storm spotters may be needed tonight through early
Thursday morning.

ARZ073-LAZ004>006-011>014-017>022-TXZ166-167-111315-
Union-Claiborne-Lincoln-Red River-Bienville-Jackson-Ouachita-
Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle-San Augustine-
709 AM CST Wed Nov 10 2021

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

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

Showers and thunderstorms will begin to increase across the area
by late this evening through the overnight hours with the next
cold front and associated upper level storm system entering the
region. Although the overall severe weather threat is generally
low, a few strong storms cannot be ruled out along a developing
squall line by late this evening through early Thursday morning.
However, any gusty winds along the line of storms should remain
non-severe.

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

Showers and thunderstorms will be ending by mid to late Thursday
morning as a cold front continues advancing across the region.
Skies will gradually clear behind the front through the remainder
of Thursday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators and storm spotters may be needed tonight through early
Thursday morning.

19

In the hours before

Special weather statement, Nov 11, 2:59 AM CST, 1 hour 37 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>

Special weather statement, Nov 11, 3:01 AM CST, 1 hour 35 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>

Special weather statement, Nov 11, 3:26 AM CST, 1 hour 10 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>

Special weather statement, Nov 11, 3:45 AM CST, 51 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>

Special weather statement, Nov 11, 3:49 AM CST, 47 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>

Special weather statement, Nov 11, 4:36 AM CST, 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
Nov 10, 10:28 PM CST	Special Weather Statement	SHV	Franklin, Wood	62 min
Nov 10, 10:39 PM CST	Special Weather Statement	SHV	Red River	51 min
Nov 10, 10:46 PM CST	Severe Thunderstorm Warning	SHV	Camp, Franklin, Marion, Morris, Titus, Upshur and 1 more	59 min
Nov 10, 11:09 PM CST	Special Weather Statement	SHV	Smith	51 min
Nov 10, 11:37 PM CST	Special Weather Statement	SHV	Cass, Morris, Upshur	23 min
Nov 10, 11:54 PM CST	Special Weather Statement	SHV	Gregg, Harrison, Marion, Rusk	66 min
Nov 11, 12:33 AM CST	Special Weather Statement	SHV	Cherokee	27 min
Nov 11, 12:36 AM CST	Special Weather Statement	SHV	Panola, Rusk	39 min
Nov 11, 12:50 AM CST	Tornado Warning	SHV	Harrison, Panola	25 min
Nov 11, 1:18 AM CST	Special Weather Statement	SHV	Shelby	57 min
Nov 11, 2:20 AM CST	Special Weather Statement	SHV	Sabine, San Augustine	40 min
Nov 11, 2:23 AM CST	Special Weather Statement	SHV	Cherokee	52 min
Nov 11, 3:01 AM CST	Special Weather Statement	SHV	Angelina, Sabine	44 min
Nov 11, 3:49 AM CST	Special Weather Statement	SHV	Angelina	26 min
Nov 11, 1:14 AM CST	Tornado Warning	SHV	Bossier, Caddo	22 min
Nov 11, 1:23 AM CST	Special Weather Statement	SHV	Bossier, Webster	67 min
Nov 11, 1:32 AM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more	58 min
Nov 11, 2:05 AM CST	Tornado Warning	SHV	Bienville, Red River	25 min
Nov 11, 2:30 AM CST	Special Weather Statement	SHV	Bienville, Lincoln	45 min
Nov 11, 2:56 AM CST	Special Weather Statement	SHV	Jackson, Lincoln, Union	34 min
Nov 11, 2:59 AM CST	Special Weather Statement	SHV	Natchitoches, Sabine, Winn	46 min
Nov 11, 3:26 AM CST	Special Weather Statement	SHV	Ouachita	64 min
Nov 11, 3:45 AM CST	Special Weather Statement	SHV	Caldwell, Grant, Winn	60 min
Nov 11, 12:08 AM CST	Special Weather Statement	SHV	Hempstead	37 min
Nov 11, 2:17 AM CST	Special Weather Statement	SHV	Union	43 min
Nov 10, 10:00 PM CST	Special Weather Statement	SHV	McCurtain	45 min
Nov 10, 10:12 PM CST	Special Weather Statement	SHV	McCurtain	33 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.