Alert archive / Louisiana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 41, NWS New Orleans, LA

April 26, 2026Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; Pike County, Walthall County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 26, 2026, 7:28 AM CDT for Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; Pike County, Walthall County, Mississippi. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 26, 2026, 7:28 AM CDT (12:28 UTC)
Expired: Apr 26, 2026, 8:15 AM CDT
In force: 47 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Pike County, MS, Walthall County, MS

The radar

The Hammond radar (KHDC), 46 km from the middle of the area, began a volume at 12:30 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, 0.5 hours before the alert went out and 96 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: 1874 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Apr 25, 2:15 PM CDT, 17 hours 13 minutes earlier.

Area forecast discussion, Apr 25, 2:15 PM CDT, 17 hours 13 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
Apr 26, 7:30 AM CDT	Special Weather Statement	LIX	East Feliciana	45 min
Apr 26, 8:09 AM CDT	Special Weather Statement	LIX	Tangipahoa, Washington	36 min
Apr 26, 8:14 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	15 min
Apr 26, 8:48 AM CDT	Special Weather Statement	LIX	Saint Tammany	42 min
Apr 26, 8:55 AM CDT	Special Marine Warning	LIX		79 min
Apr 26, 9:22 AM CDT	Special Weather Statement	LIX	Orleans	53 min
Apr 26, 9:30 AM CDT	Special Marine Warning	LIX		90 min
Apr 26, 10:14 AM CDT	Special Weather Statement	LIX	Saint Bernard	61 min
Apr 26, 10:41 AM CDT	Special Marine Warning	LIX		79 min
Apr 26, 10:57 AM CDT	Special Marine Warning	LIX		63 min
Apr 26, 11:34 AM CDT	Special Marine Warning	LIX		61 min
Apr 26, 12:09 PM CDT	Special Marine Warning	LIX		51 min
Apr 26, 6:30 AM CDT	Special Weather Statement	LIX	Amite, Pike, Walthall, Wilkinson	60 min
Apr 26, 6:45 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall	64 min
Apr 26, 9:28 AM CDT	Special Weather Statement	LIX	Hancock, Harrison	32 min
Apr 26, 9:59 AM CDT	Special Weather Statement	LIX	Hancock, Harrison, Jackson	31 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2026 Severe Thunderstorm Warnings in Mississippi, 2026 Every severe thunderstorm warning in 2026

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.