Alert archive / Louisiana / Areal Flood Warnings in 2021

Areal Flood Warning 18, NWS Lake Charles, LA

May 18, 20214 parishes in Louisiana

NWS Lake Charles, LA issued this areal flood warning at May 18, 2021, 7:54 AM CDT for 4 parishes in Louisiana. It was in force for 2 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: May 18, 2021, 7:54 AM CDT (12:54 UTC)
Expired: May 18, 2021, 10:00 AM CDT
In force: 2 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

Counties Iberia Parish, LA, Lafayette Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 124 km from the middle of the area, began a volume at 12:56 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.9 hours before the alert went out and 122 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: 1216 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lake Charles, LA wrote its last area forecast discussion before this areal flood warning went out at May 18, 6:43 AM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, May 18, 6:43 AM CDT, 1 hour 11 minutes before

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Hazardous weather outlook, May 18, 5:37 AM CDT, 2 hours 17 minutes before

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In the hours before

Local storm report, May 18, 2:16 AM CDT, 5 hours 38 minutes before

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Local storm report, May 18, 3:22 AM CDT, 4 hours 32 minutes before

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Local storm report, May 18, 3:23 AM CDT, 4 hours 31 minutes before

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<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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      <p class="small" id="detail">
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Local storm report, May 18, 3:45 AM CDT, 4 hours 9 minutes before

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<head>
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  <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 Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:01 PM CDT	Flash Flood Warning	LCH	Lafayette	5 hr
May 17, 7:18 PM CDT	Tornado Warning	LCH	Iberia, Lafayette, Saint Martin	27 min
May 17, 7:19 PM CDT	Tornado Warning	LCH	Lafayette, Vermilion	26 min
May 17, 7:20 PM CDT	Flash Flood Warning	LCH	Vermilion	3 hr
May 17, 7:35 PM CDT	Areal Flood Warning	LCH	Acadia, Allen, Calcasieu, Evangeline, Jefferson Davis	6 hr
May 17, 7:40 PM CDT	Special Marine Warning	LCH		65 min
May 17, 7:46 PM CDT	Tornado Warning	LCH	Iberia, Vermilion	29 min
May 17, 8:22 PM CDT	Special Weather Statement	LCH	Saint Martin	38 min
May 17, 8:23 PM CDT	Flash Flood Warning Considerable damage threat	LCH	Iberia, Lafayette, Saint Martin, Vermilion	3 hr
May 17, 8:33 PM CDT	River Flood Warning	LCH	Lafayette, Saint Landry, Saint Martin	8 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Beauregard, Vernon	8 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Calcasieu	12 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Acadia, Evangeline, Saint Landry	5 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Allen, Rapides	21 days
May 17, 8:33 PM CDT	River Flood Warning	LCH	Acadia, Allen, Evangeline, Jefferson Davis	8 days
May 17, 8:33 PM CDT	Special Marine Warning	LCH		87 min
May 17, 8:53 PM CDT	Special Weather Statement	LCH	Saint Martin, St. Mary	52 min
May 17, 9:49 PM CDT	Special Weather Statement	LCH	Iberia, St. Mary	56 min
May 17, 9:54 PM CDT	Special Marine Warning	LCH		96 min
May 17, 11:08 PM CDT	Areal Flood Warning	LCH	Vermilion	3 hr
May 17, 11:44 PM CDT	Areal Flood Warning	LCH	Iberia, Lafayette, Saint Martin, Vermilion	3 hr
May 18, 12:24 AM CDT	Special Marine Warning	LCH		66 min
May 18, 1:40 AM CDT	Areal Flood Warning	LCH	Acadia, Calcasieu, Jefferson Davis	5 hr
May 18, 1:48 AM CDT	Small Craft Advisory	LCH		5 days
May 18, 2:25 AM CDT	Areal Flood Warning	LCH	Iberia, Lafayette, Saint Landry, Saint Martin, Vermilion	6 hr
May 18, 2:25 AM CDT	Special Marine Warning	LCH		50 min
May 18, 7:00 AM CDT	Areal Flood Warning	LCH	Calcasieu, Jefferson Davis	3 hr
May 18, 9:47 AM CDT	Special Marine Warning	LCH		58 min
May 18, 11:06 AM CDT	River Flood Warning	LCH	Allen, Beauregard	21 days
May 18, 11:56 AM CDT	River Flood Warning	LCH	Calcasieu	10 days
May 18, 1:25 PM CDT	Special Marine Warning	LCH		65 min
May 18, 1:42 PM CDT	Coastal Flood Advisory	LCH	Cameron	8 hr
May 18, 1:57 PM CDT	Wind Advisory	LCH	Cameron, Saint Martin	14 hr
May 17, 8:33 PM CDT	River Flood Warning	LCH	Hardin, Jasper, Jefferson, Orange	8 days
May 17, 8:34 PM CDT	Areal Flood Warning	LCH	Jefferson	6 hr
May 18, 2:35 AM CDT	Areal Flood Warning	LCH	Jefferson	5 hr
May 18, 7:58 AM CDT	Areal Flood Warning	LCH	Jefferson	2 hr

Nearby

Areal Flood Warnings in Louisiana, 2021 Every areal flood warning 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.