Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 64, NWS Jacksonville, FL

April 13, 2023Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 13, 2023, 7:07 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 23 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 13, 2023, 7:07 PM EDT (23:07 UTC)
Expired: Apr 13, 2023, 7:30 PM EDT
In force: 23 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 43 km from the middle of the area, began a volume at 23:06 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 13, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.1 hours before the alert went out and 45 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: 72 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 13, 7:05 PM EDT, 2 minutes earlier.

Area forecast discussion, Apr 13, 7:05 PM EDT, 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>

In the hours before

Local storm report, Apr 13, 5:38 PM EDT, 1 hour 29 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, Apr 13, 5:42 PM EDT, 1 hour 25 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, Apr 13, 5:46 PM EDT, 1 hour 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>

Special weather statement, Apr 13, 6:20 PM EDT, 47 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, Apr 13, 6:25 PM EDT, 42 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, Apr 13, 6:56 PM EDT, 11 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 Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 13, 8:00 AM EDT	Special Marine Warning	JAX		60 min
Apr 13, 8:10 AM EDT	Special Weather Statement	JAX	Duval	50 min
Apr 13, 8:51 AM EDT	Special Marine Warning	JAX		54 min
Apr 13, 9:05 AM EDT	Severe Thunderstorm Warning	JAX	Nassau	40 min
Apr 13, 9:19 AM EDT	Special Marine Warning	JAX		56 min
Apr 13, 2:46 PM EDT	Special Weather Statement	JAX	Clay	44 min
Apr 13, 3:17 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Saint Johns	43 min
Apr 13, 3:35 PM EDT	Special Weather Statement	JAX	Nassau	40 min
Apr 13, 3:41 PM EDT	Special Marine Warning	JAX		64 min
Apr 13, 3:45 PM EDT	Special Weather Statement	JAX	Saint Johns	45 min
Apr 13, 4:10 PM EDT	Special Weather Statement	JAX	Saint Johns	35 min
Apr 13, 4:18 PM EDT	Special Marine Warning	JAX		57 min
Apr 13, 4:21 PM EDT	Special Weather Statement	JAX	Duval	54 min
Apr 13, 4:25 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	35 min
Apr 13, 4:49 PM EDT	Special Weather Statement	JAX	Flagler	41 min
Apr 13, 4:51 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	24 min
Apr 13, 4:56 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Saint Johns	34 min
Apr 13, 5:10 PM EDT	Special Marine Warning	JAX		65 min
Apr 13, 5:32 PM EDT	Special Weather Statement	JAX	Flagler	43 min
Apr 13, 5:43 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval	47 min
Apr 13, 6:20 PM EDT	Special Weather Statement	JAX	Nassau	55 min
Apr 13, 6:25 PM EDT	Special Weather Statement	JAX	Saint Johns	35 min
Apr 13, 6:28 PM EDT	Special Marine Warning	JAX		62 min
Apr 13, 6:42 PM EDT	Areal Flood Advisory	JAX	Saint Johns	63 min
Apr 13, 6:56 PM EDT	Special Weather Statement	JAX	Saint Johns	34 min
Apr 13, 7:21 PM EDT	Special Marine Warning	JAX		114 min
Apr 13, 7:30 PM EDT	Special Weather Statement	JAX	Duval	30 min
Apr 13, 7:50 PM EDT	Areal Flood Advisory	JAX	Saint Johns	55 min
Apr 13, 8:52 AM EDT	Special Weather Statement	JAX	Camden	38 min
Apr 13, 9:51 AM EDT	Special Weather Statement	JAX	Camden	24 min
Apr 13, 2:29 PM EDT	Special Weather Statement	JAX	Coffee	46 min
Apr 13, 2:37 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	38 min
Apr 13, 3:14 PM EDT	Special Weather Statement	JAX	Coffee, Jeff Davis	46 min
Apr 13, 3:22 PM EDT	Severe Thunderstorm Warning	JAX	Coffee, Jeff Davis	38 min
Apr 13, 3:42 PM EDT	Tornado Warning	JAX	Jeff Davis	33 min
Apr 13, 4:03 PM EDT	Severe Thunderstorm Warning	JAX	Jeff Davis	27 min
Apr 13, 4:13 PM EDT	Special Weather Statement	JAX	Pierce	47 min
Apr 13, 4:16 PM EDT	Tornado Warning	JAX	Jeff Davis	29 min
Apr 13, 4:31 PM EDT	Special Weather Statement	JAX	Jeff Davis	44 min
Apr 13, 4:34 PM EDT	Severe Thunderstorm Warning	JAX	Pierce	41 min
Apr 13, 4:39 PM EDT	Tornado Warning	JAX	Appling, Jeff Davis	21 min
Apr 13, 4:59 PM EDT	Special Weather Statement	JAX	Appling, Wayne	61 min
Apr 13, 5:06 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Wayne	39 min
Apr 13, 5:10 PM EDT	Tornado Warning	JAX	Appling, Wayne	35 min
Apr 13, 5:46 PM EDT	Special Weather Statement	JAX	Wayne	44 min
Apr 13, 7:46 PM EDT	Special Weather Statement	JAX	Brantley	14 min
Apr 13, 7:59 PM EDT	Special Weather Statement	JAX	Pierce	31 min

Nearby

Severe Thunderstorm Warnings in Florida, 2023 Every severe thunderstorm 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.