Alert archive / Mississippi / Flash Flood Warnings in 2023

Flash Flood Warning 29, NWS New Orleans, LA

June 20, 2023Harrison County, Jackson County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Jun 20, 2023, 10:57 AM CDT for Harrison County, Jackson County, Mississippi. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 2023, 10:57 AM CDT (15:57 UTC)
Expired: Jun 20, 2023, 4:18 PM CDT
In force: 5 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 64 km from the middle of the area, began a volume at 15:57 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.0 hours before the alert went out and 84 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: 1812 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Jun 20, 4:18 AM CDT, 6 hours 39 minutes earlier.

Area forecast discussion, Jun 20, 4:18 AM CDT, 6 hours 39 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>

In the hours before

Local storm report, Jun 20, 8:55 AM CDT, 2 hours 2 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>

Local storm report, Jun 20, 10:25 AM CDT, 32 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, Jun 20, 10:36 AM CDT, 21 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 New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:07 PM CDT	Special Marine Warning	LIX		113 min
Jun 19, 7:52 PM CDT	Special Marine Warning	LIX		2 hr
Jun 19, 7:58 PM CDT	Special Weather Statement	LIX	Washington	32 min
Jun 19, 8:24 PM CDT	Areal Flood Advisory	LIX	Orleans, Saint Tammany	2 hr
Jun 19, 8:27 PM CDT	Special Weather Statement	LIX	Washington	33 min
Jun 19, 8:38 PM CDT	Tornado Warning	LIX	Saint Tammany	52 min
Jun 19, 8:46 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	44 min
Jun 19, 8:51 PM CDT	Special Marine Warning	LIX		114 min
Jun 19, 9:00 PM CDT	Special Weather Statement	LIX	Washington	30 min
Jun 19, 9:10 PM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Jun 19, 9:16 PM CDT	Special Marine Warning	LIX		59 min
Jun 19, 9:19 PM CDT	Tornado Warning	LIX	Saint Tammany	41 min
Jun 19, 9:24 PM CDT	Special Marine Warning	LIX		66 min
Jun 19, 9:27 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	48 min
Jun 19, 9:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Saint Tammany	24 min
Jun 19, 9:45 PM CDT	Severe Thunderstorm Warning	LIX	Orleans, Saint Tammany	60 min
Jun 19, 9:55 PM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa	3 hr
Jun 19, 10:02 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	43 min
Jun 19, 10:09 PM CDT	Special Marine Warning	LIX		66 min
Jun 19, 10:09 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	51 min
Jun 19, 10:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Plaquemines, Saint Bernard	46 min
Jun 19, 10:21 PM CDT	Special Marine Warning	LIX		84 min
Jun 19, 10:38 PM CDT	Special Marine Warning	LIX		97 min
Jun 19, 10:59 PM CDT	Special Weather Statement	LIX	Orleans	46 min
Jun 19, 11:01 PM CDT	Special Weather Statement	LIX	Tangipahoa	44 min
Jun 19, 11:19 PM CDT	Flash Flood Warning	LIX	Livingston, Saint Helena, Tangipahoa	5 hr
Jun 19, 11:27 PM CDT	Special Marine Warning	LIX		63 min
Jun 19, 11:40 PM CDT	Special Weather Statement	LIX	Assumption, East Baton Rouge, Iberville, West Baton Rouge	50 min
Jun 19, 11:49 PM CDT	Special Marine Warning	LIX		26 min
Jun 20, 12:10 AM CDT	Special Weather Statement	LIX	Saint Charles	50 min
Jun 20, 12:13 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	47 min
Jun 20, 12:29 AM CDT	Special Weather Statement	LIX	Orleans	31 min
Jun 20, 12:45 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	45 min
Jun 20, 1:02 AM CDT	Special Marine Warning	LIX		58 min
Jun 20, 1:24 AM CDT	Special Weather Statement	LIX	Saint Charles	51 min
Jun 20, 2:15 AM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint John the Baptist, Tangipahoa	33 min
Jun 20, 2:18 AM CDT	Special Marine Warning	LIX		39 min
Jun 20, 2:56 AM CDT	Special Marine Warning	LIX		94 min
Jun 20, 3:13 AM CDT	Special Weather Statement	LIX	Tangipahoa	32 min
Jun 20, 3:52 AM CDT	Special Marine Warning	LIX		53 min
Jun 20, 10:03 AM CDT	Special Marine Warning	LIX		57 min
Jun 20, 11:01 AM CDT	Special Marine Warning	LIX		89 min
Jun 20, 11:38 AM CDT	Special Marine Warning	LIX		32 min
Jun 20, 12:31 PM CDT	Special Marine Warning	LIX		89 min
Jun 20, 12:34 PM CDT	Special Weather Statement	LIX	Saint Bernard	41 min
Jun 20, 12:37 PM CDT	Special Marine Warning	LIX		113 min
Jun 20, 12:50 PM CDT	Special Weather Statement	LIX	Jefferson	40 min
Jun 20, 1:01 PM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard	44 min
Jun 20, 1:15 PM CDT	Special Weather Statement	LIX	Washington	45 min
Jun 20, 1:43 PM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard, Saint Tammany	47 min
Jun 20, 1:46 PM CDT	Special Weather Statement	LIX	Saint Bernard	29 min
Jun 20, 1:52 PM CDT	Special Marine Warning	LIX		83 min
Jun 20, 1:55 PM CDT	Special Weather Statement	LIX	Orleans	35 min
Jun 20, 2:11 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	49 min
Jun 20, 2:31 PM CDT	Special Marine Warning	LIX		59 min
Jun 20, 2:36 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines	39 min
Jun 20, 2:48 PM CDT	Special Marine Warning	LIX		57 min
Jun 20, 3:01 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	59 min
Jun 20, 3:05 PM CDT	Special Marine Warning	LIX		40 min
Jun 20, 3:07 PM CDT	Special Marine Warning	LIX		113 min
Jun 20, 3:12 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines, Saint Charles	48 min
Jun 20, 3:28 PM CDT	Gale Warning	LIX		5 hr
Jun 20, 3:31 PM CDT	Wind Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint John the Baptist	4 hr
Jun 20, 3:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Lafourche, Saint Charles, Saint James, Saint John the Baptist	40 min
Jun 20, 3:43 PM CDT	Special Marine Warning	LIX		2 hr
Jun 20, 3:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Plaquemines	54 min
Jun 20, 4:00 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	45 min
Jun 20, 4:05 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Ascension, Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist	40 min
Jun 20, 4:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Lafourche, Terrebonne	48 min
Jun 20, 4:38 PM CDT	Special Weather Statement	LIX	East Feliciana	52 min
Jun 20, 4:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 3 more	45 min
Jun 20, 4:46 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	East Baton Rouge, East Feliciana	44 min
Jun 20, 4:57 PM CDT	Special Marine Warning	LIX		106 min
Jun 20, 5:04 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, West Baton Rouge	41 min
Jun 20, 5:19 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Terrebonne	41 min
Jun 20, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Saint James and 1 more	38 min
Jun 20, 5:25 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston	50 min
Jun 20, 5:29 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa	28 min
Jun 20, 5:55 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Assumption, Lafourche, Terrebonne	50 min
Jun 20, 6:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, Iberville, Lafourche, Saint James	45 min

Nearby

Flash Flood Warnings in Mississippi, 2023 Every flash flood warning in 2023

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.