Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

June 29, 2021Saint Helena Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jun 29, 2021, 2:14 PM CDT for Saint Helena Parish, Louisiana. It was in force for 31 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: Jun 29, 2021, 2:14 PM CDT (19:14 UTC)
Expired: Jun 29, 2021, 2:45 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA

County Saint Helena Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.2 hours before the alert went out and 102 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: 1396 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 740 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -28 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 Jun 29, 12:26 PM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Jun 29, 12:26 PM CDT, 1 hour 48 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.
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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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In the hours before

Special weather statement, Jun 29, 12:04 PM CDT, 2 hours 10 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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Special weather statement, Jun 29, 12:36 PM CDT, 1 hour 38 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1236 PM CDT Tue Jun 29 2021

LAZ056-291800-
Assumption-
1236 PM CDT Tue Jun 29 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ASSUMPTION
PARISH...

At 1235 PM CDT, a strong thunderstorm was located over Belle River,
moving west at 20 mph.

Winds in excess of 40 mph are possible with this storm.

This storm will remain over mainly rural areas of west central
Assumption Parish.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2993 9110 2984 9113 2985 9118 2986 9120
      2990 9121 2992 9123 2993 9123 2995 9125
      2999 9126
TIME...MOT...LOC 1735Z 104DEG 16KT 2991 9122

KLG

Special weather statement, Jun 29, 2:14 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
214 PM CDT Tue Jun 29 2021

LAZ037-071-291945-
St. Helena-Northern Tangipahoa-
214 PM CDT Tue Jun 29 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ST. HELENA AND
NORTHERN TANGIPAHOA PARISHES...

At 214 PM CDT, a strong thunderstorm was located near Wilmer, or 7
miles northeast of Amite, moving northwest at 25 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Greensburg, Amite City, Kentwood, Roseland, Wilmer and Tangipahoa.

This includes Interstate 55 in Louisiana between mile markers 49 and
64.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3081 9031 3072 9036 3078 9068 3084 9073
      3100 9064 3100 9054
TIME...MOT...LOC 1914Z 117DEG 23KT 3079 9041

KLG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 10:58 PM CDT	Special Marine Warning	LIX		62 min
Jun 29, 12:04 PM CDT	Special Weather Statement	LIX	Saint Helena	41 min
Jun 29, 12:36 PM CDT	Special Weather Statement	LIX	Assumption	24 min
Jun 29, 4:35 PM CDT	Special Weather Statement	LIX	Saint Charles	40 min
Jun 29, 5:05 PM CDT	Special Weather Statement	LIX	Saint Charles	25 min
Jun 29, 5:23 PM CDT	Special Marine Warning	LIX		25 min
Jun 29, 5:28 PM CDT	Special Weather Statement	LIX	Saint John the Baptist	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.