Alert archive / Louisiana / Flash Flood Warnings in 2025

Flash Flood Warning 28, NWS New Orleans, LA

May 28, 2025Jefferson Parish, Orleans Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 28, 2025, 3:00 PM CDT for Jefferson Parish, Orleans Parish, Louisiana. It was in force for 3 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 28, 2025, 3:00 PM CDT (20:00 UTC)
Expired: May 28, 2025, 6:00 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Jefferson Parish, LA, Orleans Parish, LA

The radar

The Hammond radar (KHDC), 81 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 51 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: 2432 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

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 May 27, 6:46 PM CDT, 20 hours 14 minutes earlier.

Area forecast discussion, May 27, 6:46 PM CDT, 20 hours 14 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
May 28, 10:31 AM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	89 min
May 28, 12:16 PM CDT	Special Weather Statement	LIX	Saint Charles	44 min
May 28, 12:57 PM CDT	Special Weather Statement	LIX	Saint Charles, Saint John the Baptist	48 min
May 28, 1:00 PM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	30 min
May 28, 1:09 PM CDT	Special Marine Warning	LIX		66 min
May 28, 1:29 PM CDT	Special Weather Statement	LIX	Assumption	46 min
May 28, 1:31 PM CDT	Special Weather Statement	LIX	Orleans	44 min
May 28, 1:36 PM CDT	Special Marine Warning	LIX		39 min
May 28, 1:48 PM CDT	Special Weather Statement	LIX	Ascension, Assumption, Saint James	27 min
May 28, 1:59 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	3 hr
May 28, 2:08 PM CDT	Special Marine Warning	LIX		67 min
May 28, 2:10 PM CDT	Special Weather Statement	LIX	Orleans	50 min
May 28, 2:15 PM CDT	Special Weather Statement	LIX	Ascension, Assumption, Iberville, Saint James	45 min
May 28, 2:30 PM CDT	Flash Flood Warning	LIX	Orleans	3 hr
May 28, 2:31 PM CDT	Special Weather Statement	LIX	Saint Charles	29 min
May 28, 2:40 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Tangipahoa	50 min
May 28, 2:55 PM CDT	Special Weather Statement	LIX	Ascension, East Baton Rouge, Iberville, West Baton Rouge	50 min
May 28, 3:32 PM CDT	Severe Thunderstorm Warning	LIX	Washington	43 min
May 28, 3:34 PM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Tangipahoa and 2 more	41 min
May 28, 3:53 PM CDT	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	52 min
May 28, 3:56 PM CDT	Special Weather Statement	LIX	Assumption, Saint James	49 min
May 28, 4:00 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, West Baton Rouge and 1 more	45 min
May 28, 4:13 PM CDT	Special Weather Statement	LIX	Orleans	47 min
May 28, 4:14 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines	3 hr
May 28, 4:17 PM CDT	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa, Washington	43 min
May 28, 4:41 PM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	64 min
May 28, 4:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Tangipahoa, Washington	50 min
May 28, 5:03 PM CDT	Special Weather Statement	LIX	Orleans, Saint Charles, Saint James	42 min
May 28, 5:23 PM CDT	Special Weather Statement	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge	67 min
May 28, 5:52 PM CDT	Special Weather Statement	LIX	Saint Charles, Saint John the Baptist	38 min
May 28, 6:55 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche, Terrebonne	50 min
May 28, 3:50 PM CDT	Severe Thunderstorm Warning	LIX	Pearl River	40 min
May 28, 4:35 PM CDT	Special Weather Statement	LIX	Pearl River	25 min
May 28, 5:41 PM CDT	Special Weather Statement	LIX	Walthall	34 min

Nearby

Flash Flood Warnings in Louisiana, 2025 Every flash flood warning in 2025

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.