Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

July 11, 2021Saint James Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 11, 2021, 7:36 AM CDT for Saint James Parish, Louisiana. It was in force for 39 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: Jul 11, 2021, 7:36 AM CDT (12:36 UTC)
Expired: Jul 11, 2021, 8:15 AM CDT
In force: 39 min
Issued by: NWS New Orleans, LA

County Saint James Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.6 hours before the alert went out and 117 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: 2500 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 707 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 New Orleans, LA wrote its last area forecast discussion before this special weather statement went out at Jul 11, 6:18 AM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Jul 11, 6:18 AM CDT, 1 hour 18 minutes before

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<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.
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In the hours before

Special weather statement, Jul 11, 7:36 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
736 AM CDT Sun Jul 11 2021

LAZ057>059-065-111315-
Upper Terrebonne-St. John The Baptist-St. James-Upper Lafourche-
736 AM CDT Sun Jul 11 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. JOHN THE
BAPTIST...SOUTHEASTERN ST. JAMES...NORTH CENTRAL TERREBONNE AND
NORTHWESTERN LAFOURCHE PARISHES...

At 736 AM CDT, a strong thunderstorm was located near Gray, or 7
miles south of Thibodaux, moving northeast at 20 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Thibodaux, Schriever, Gray, Raceland, South Vacherie, Des Allemands,
Bayou Cane and Chackbay.

If outdoors, consider seeking shelter inside a building.

LAT...LON 2959 9085 2968 9094 2998 9065 2978 9045
TIME...MOT...LOC 1236Z 229DEG 18KT 2968 9084

PG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 10:13 AM CDT	Special Weather Statement	LIX	Orleans	47 min
Jul 11, 10:18 AM CDT	Special Marine Warning	LIX		48 min
Jul 11, 11:07 AM CDT	Special Marine Warning	LIX		83 min
Jul 11, 11:09 AM CDT	Special Weather Statement	LIX	Orleans	36 min
Jul 11, 11:10 AM CDT	Special Weather Statement	LIX	Terrebonne	35 min
Jul 11, 12:47 PM CDT	Special Weather Statement	LIX	Saint Helena, Tangipahoa	58 min
Jul 11, 1:25 PM CDT	Special Weather Statement	LIX	Washington	80 min
Jul 11, 1:37 PM CDT	Special Weather Statement	LIX	Washington	68 min
Jul 11, 1:58 PM CDT	Areal Flood Advisory	LIX	Saint Tammany, Tangipahoa, Washington	2 hr
Jul 11, 2:19 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	71 min
Jul 11, 2:27 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, Livingston, Saint Helena, West Baton Rouge	99 min
Jul 11, 3:13 PM CDT	Special Weather Statement	LIX	Tangipahoa	77 min
Jul 11, 3:15 PM CDT	Special Marine Warning	LIX		90 min
Jul 11, 3:52 PM CDT	Special Weather Statement	LIX	Ascension, Saint John the Baptist	38 min
Jul 11, 3:55 PM CDT	Special Weather Statement	LIX	Saint Tammany	65 min
Jul 11, 4:02 PM CDT	Special Marine Warning	LIX		58 min
Jul 11, 4:14 PM CDT	Special Marine Warning	LIX		61 min
Jul 11, 4:21 PM CDT	Areal Flood Advisory	LIX	Saint John the Baptist	89 min
Jul 11, 4:28 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	93 min
Jul 11, 4:32 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	40 min
Jul 11, 5:03 PM CDT	Special Weather Statement	LIX	Saint Charles	27 min
Jul 11, 5:06 PM CDT	Special Marine Warning	LIX		54 min
Jul 11, 5:12 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Saint Bernard, Saint Charles	49 min
Jul 11, 6:08 PM CDT	Special Marine Warning	LIX		67 min
Jul 11, 6:47 PM CDT	Special Marine Warning	LIX		58 min
Jul 11, 11:30 AM CDT	Special Weather Statement	LIX	Hancock	60 min
Jul 11, 12:58 PM CDT	Special Weather Statement	LIX	Harrison, Jackson	2 hr
Jul 11, 2:33 PM CDT	Special Weather Statement	LIX	Pearl River	72 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.