Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 25, NWS Jacksonville, FL

February 6, 2020Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Feb 6, 2020, 11:59 PM EST for Flagler County, Florida. It was in force for 16 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: Feb 6, 2020, 11:59 PM EST (04:59 UTC)
Expired: Feb 7, 2020, 12:15 AM EST
In force: 16 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 04:59 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
Feb 6, 5:30 PM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 5.0 hours before the alert went out and 121 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: 301 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1234 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 344 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 1.9

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 Feb 6, 8:58 PM EST, 3 hours 1 minute earlier.

Area forecast discussion, Feb 6, 8:58 PM EST, 3 hours 1 minute 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, Feb 6, 11:44 PM EST, 15 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, Feb 6, 11:48 PM EST, 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>

Local storm report, Feb 6, 11:51 PM EST, 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>

Local storm report, Feb 6, 11:53 PM EST, 6 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, Feb 6, 11:54 PM EST, 5 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, Feb 6, 11:57 PM EST, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
1157 PM EST THU FEB 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1145 PM     TSTM WND GST     2 E PALM COAST          29.57N 81.19W
02/06/2020  M42 MPH          Flagler            FL   EMERGENCY MNGR

            A 42 MPH WIND GUST WAS REPORTED ON THE HAMMOCK DUNES
            BRIDGE.

&&

MZ

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 6, 7:04 PM EST	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	56 min
Feb 6, 7:42 PM EST	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Suwannee	63 min
Feb 6, 8:00 PM EST	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	45 min
Feb 6, 8:41 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Baker, Columbia, Gilchrist, Hamilton, Suwannee and 1 more	49 min
Feb 6, 8:51 PM EST	Tornado Warning	JAX	Baker, Columbia, Hamilton	39 min
Feb 6, 8:55 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Gilchrist	50 min
Feb 6, 9:22 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Baker, Bradford, Clay, Duval, Gilchrist and 3 more	38 min
Feb 6, 9:28 PM EST	Severe Thunderstorm Warning	JAX	Nassau	47 min
Feb 6, 9:34 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Marion	41 min
Feb 6, 9:43 PM EST	Special Marine Warning	JAX		2 hr
Feb 6, 9:54 PM EST	Severe Thunderstorm Warning	JAX	Nassau	51 min
Feb 6, 9:56 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay, Duval, Nassau, Putnam and 1 more	49 min
Feb 6, 10:00 PM EST	Special Marine Warning	JAX		2 hr
Feb 6, 10:11 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Marion, Putnam	49 min
Feb 6, 10:42 PM EST	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Putnam, Saint Johns	48 min
Feb 6, 10:57 PM EST	Severe Thunderstorm Warning	JAX	Flagler, Marion, Putnam, Saint Johns	63 min
Feb 6, 11:45 PM EST	Special Marine Warning	JAX		30 min
Feb 6, 11:50 PM EST	Special Marine Warning	JAX		115 min
Feb 7, 3:29 AM EST	Wind Advisory	JAX	Alachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more	10 hr
Feb 7, 1:52 PM EST	Frost Advisory	JAX	Alachua, Baker, Bradford, Gilchrist, Marion, Nassau and 2 more	19 hr
Feb 7, 1:53 PM EST	Small Craft Advisory	JAX		7 hr
Feb 6, 7:09 PM EST	Severe Thunderstorm Warning	JAX	Appling, Jeff Davis	51 min
Feb 6, 7:16 PM EST	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	44 min
Feb 6, 7:18 PM EST	Severe Thunderstorm Warning	JAX	Clinch, Echols	57 min
Feb 6, 7:34 PM EST	Tornado Warning	JAX	Atkinson, Bacon, Clinch, Coffee, Pierce, Ware	26 min
Feb 6, 7:52 PM EST	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Clinch, Coffee, Jeff Davis and 3 more	38 min
Feb 6, 7:58 PM EST	Severe Thunderstorm Warning	JAX	Appling, Brantley, Charlton, Clinch, Glynn, Pierce and 2 more	47 min
Feb 6, 8:29 PM EST	Severe Thunderstorm Warning	JAX	Appling, Bacon, Pierce, Wayne	33 min
Feb 6, 8:45 PM EST	Severe Thunderstorm Warning	JAX	Brantley, Charlton, Clinch, Echols, Pierce, Ware	45 min
Feb 6, 9:07 PM EST	Severe Thunderstorm Warning	JAX	Brantley, Glynn, Pierce, Wayne	38 min
Feb 6, 9:18 PM EST	Severe Thunderstorm Warning	JAX	Brantley, Camden, Charlton, Glynn, Wayne	42 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning in 2020

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.