Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

July 24, 2021Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 24, 2021, 2:44 PM CDT for Saint Tammany 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: Jul 24, 2021, 2:44 PM CDT (19:44 UTC)
Expired: Jul 24, 2021, 3:15 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.7 hours before the alert went out and 36 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: 2304 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 24, 12:42 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jul 24, 12:42 PM CDT, 2 hours 2 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 24, 2:44 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
244 PM CDT Sat Jul 24 2021

LAZ075-MSZ077-242015-
Northwest St. Tammany-Pearl River-
244 PM CDT Sat Jul 24 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ST. TAMMANY PARISH IN
SOUTHEASTERN LOUISIANA AND SOUTHWESTERN PEARL RIVER COUNTIES...

At 243 PM CDT, a strong thunderstorm was located near Bush, or 12
miles west of Picayune, moving south at 10 mph.

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

Locations impacted include...
Abita Springs.

This includes Interstate 12 near mile marker 66.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3061 8998 3059 8977 3039 8973 3041 9006
TIME...MOT...LOC 1943Z 008DEG 7KT 3053 8989

MSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 3:37 AM CDT	Heat Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Helena and 4 more	14 hr
Jul 24, 3:20 PM CDT	Heat Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	28 hr
Jul 24, 3:34 PM CDT	Special Weather Statement	LIX	Saint Tammany	26 min
Jul 24, 3:50 PM CDT	Special Marine Warning	LIX		55 min
Jul 24, 5:30 PM CDT	Special Weather Statement	LIX	Orleans	30 min
Jul 24, 4:51 PM CDT	Special Weather Statement	LIX	Hancock	24 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.