An expansive ridge sat over the southern portion of the CONUS. This ridge caused extreme record-breaking temperatures across much of the south, including southeast Louisiana and southern Mississippi.
Every event with a place to put it; 28 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LIX wrote it up.
An expansive ridge sat over the southern portion of the CONUS. This ridge caused extreme record-breaking temperatures across much of the south, including southeast Louisiana and southern Mississippi. The record-breaking temperatures paired with high humidity values caused the heat to be excessive across southeast Louisiana and southern Mississippi.
The local office's own words before the first event, 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 the first event at Aug 4, 2:40 AM CST, 7 hours 20 minutes earlier.
<!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 national radar mosaic for the moment the first event began.
36 excessive heat. Local standard time, as filed.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
Very hot and humid weather occurred for all of southeast Louisiana on August 4th. High temperatures were in the upper 90s to 100 degrees with heat indices were in the 113 to 115 degree range each afternoon.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2023Every state in 2023This day in weather historyWarnings in Louisiana, August 2023
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1137402, 1137403, 1137404, 1137405, 1137406, 1137407, 1137408, 1137409, 1137410, 1137411, 1137412, 1137413, 1137414, 1137415, 1137416, 1137417, 1137418, 1137419, 1137420, 1137421, 1137422, 1137423, 1137424, 1137425, 1137426, 1137427, 1137428, 1137429, 1137430, 1137431, 1137432, 1137433, 1137434, 1137435, 1137436, 1137437.