Alert archive / Florida / Flash Flood Warnings in 2024

Flash Flood Warning 3, NWS Jacksonville, FL

August 5, 2024Alachua County, Gilchrist County, Florida

NWS Jacksonville, FL issued this flash flood warning at Aug 5, 2024, 4:29 AM EDT for Alachua County, Gilchrist County, Florida. It was in force for 9 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: Aug 5, 2024, 4:29 AM EDT (08:29 UTC)
Expired: Aug 5, 2024, 1:00 PM EDT
In force: 9 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

Counties Alachua County, FL, Gilchrist County, FL

The radar

The Jacksonville radar (KJAX), 121 km from the middle of the area, began a volume at 08:28 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

Jacksonville, FL (KJAX), launched 00:00Z, 8.5 hours before the alert went out and 123 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: 590 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.1

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 Jacksonville, FL wrote its last area forecast discussion before this flash flood warning went out at Aug 5, 2:52 AM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, Aug 5, 2:52 AM EDT, 1 hour 37 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, Aug 5, 2:51 AM EDT, 1 hour 38 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, Aug 5, 3:41 AM EDT, 48 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, Aug 5, 3:42 AM 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>

Local storm report, Aug 5, 3:54 AM EDT, 35 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, Aug 5, 4:01 AM EDT, 28 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, Aug 5, 4:21 AM EDT, 8 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
Aug 4, 8:10 PM EDT	Special Marine Warning	JAX		65 min
Aug 4, 8:41 PM EDT	Areal Flood Advisory	JAX	Alachua, Gilchrist, Marion	3 hr
Aug 4, 8:56 PM EDT	Special Marine Warning	JAX		64 min
Aug 4, 9:20 PM EDT	Special Marine Warning	JAX		55 min
Aug 4, 10:07 PM EDT	Special Marine Warning	JAX		53 min
Aug 4, 10:43 PM EDT	River Flood Warning	JAX	Hamilton, Suwannee	19 days
Aug 4, 10:43 PM EDT	River Flood Warning	JAX	Columbia, Gilchrist	21 days
Aug 4, 10:43 PM EDT	River Flood Warning	JAX	Alachua, Columbia	21 days
Aug 4, 11:07 PM EDT	Special Marine Warning	JAX		83 min
Aug 4, 11:12 PM EDT	Areal Flood Advisory	JAX	Marion	3 hr
Aug 4, 11:52 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Gilchrist, Suwannee	3 hr
Aug 5, 12:27 AM EDT	Special Marine Warning	JAX		63 min
Aug 5, 12:50 AM EDT	Areal Flood Warning	JAX	Alachua, Gilchrist, Marion	6 hr
Aug 5, 1:25 AM EDT	Coastal Flood Advisory	JAX	Duval, Nassau	28 hr
Aug 5, 1:25 AM EDT	High Surf Advisory	JAX	Duval, Nassau	37 hr
Aug 5, 1:27 AM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Columbia, Gilchrist, Hamilton, Suwannee and 1 more	3 hr
Aug 5, 1:57 AM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Columbia, Gilchrist, Marion, Putnam and 1 more	3 hr
Aug 5, 2:19 AM EDT	Wind Advisory	JAX	Flagler	21 hr
Aug 5, 4:19 AM EDT	Areal Flood Warning	JAX	Alachua, Bradford, Clay, Columbia, Gilchrist, Hamilton and 4 more	6 hr
Aug 5, 6:44 AM EDT	Areal Flood Warning	JAX	Alachua, Gilchrist, Marion	6 hr
Aug 5, 7:08 AM EDT	Flash Flood Warning	JAX	Columbia, Gilchrist, Suwannee	5 hr
Aug 5, 7:24 AM EDT	Areal Flood Warning	JAX	Baker, Bradford, Columbia, Hamilton, Union	6 hr
Aug 5, 7:43 AM EDT	Flash Flood Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Hamilton, Union	5 hr
Aug 5, 9:22 AM EDT	Flash Flood Warning Considerable damage threat	JAX	Suwannee	3 hr
Aug 5, 9:51 AM EDT	Flash Flood Warning	JAX	Baker, Columbia, Hamilton, Suwannee	6 hr
Aug 5, 10:37 AM EDT	Areal Flood Warning	JAX	Nassau	3 hr
Aug 5, 12:21 PM EDT	Flash Flood Warning EmergencyConsiderable damage threat	JAX	Columbia, Gilchrist, Hamilton, Suwannee	6 hr
Aug 5, 3:42 PM EDT	Flash Flood Warning	JAX	Baker, Columbia, Hamilton, Union	6 hr
Aug 5, 3:55 PM EDT	Tornado Warning	JAX	Duval, Saint Johns	20 min
Aug 5, 4:34 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	JAX	Baker, Columbia, Hamilton, Suwannee	3 hr
Aug 5, 5:28 PM EDT	Tornado Warning	JAX	Duval, Saint Johns	32 min
Aug 4, 10:29 PM EDT	River Flood Warning	JAX	Echols	21 days
Aug 4, 10:43 PM EDT	River Flood Warning	JAX	Pierce, Ware	21 days
Aug 5, 9:42 AM EDT	River Flood Warning	JAX	Glynn, McIntosh, Wayne	24 hr

Nearby

Flash Flood Warnings in Florida, 2024 Every flash flood warning in 2024

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.