Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 52, NWS Jacksonville, FL

May 5, 2019Clay County, Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 5, 2019, 11:55 AM EDT for Clay County, Duval County, Saint Johns County, Florida. It was in force for 22 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
May 5, 2019, 11:55 AM EDT (15:55 UTC)
Expired
May 5, 2019, 12:17 PM EDT
In force
22 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Clay County, FL, Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 46 km from the middle of the area, began a volume at 15:54 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 12:00Z, 3.9 hours before the alert went out and 47 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2019-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1867 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2019-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1867 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
534 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
1.5
Supercell composite
9.2

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 May 5, 10:03 AM EDT, 1 hour 52 minutes earlier.

Area forecast discussion, May 5, 10:03 AM EDT, 1 hour 52 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
1003 AM EDT Sun May 5 2019

.UPDATE...Mid-upper trough pushing into the area has produced
showers and storms currently in a training band from near Lake
City to Cumberland Island Ga this morning. Another large area of
convection over the ne Gulf is moving ne into the I-75 corridor of
ne Fl. 12z JAX sounding shows record high PWAT of 1.84" along
with unidirectional 0-6 km bulk shear of 35 knots and MUCAPE over
2000 J/kg. Conditions warrant the threat for locally heavy
rainfall along with isolated strong to marginally severe storms
with potential for strong gusty winds over mainly ne Fl where
highest instability and moisture exists. A band of showers and
storms may develop over se Ga late this afternoon/evening as a
cold front to the west approaches the area. Expect convection to
weak this evening and end tonight with front and drier air pushing
through the area by morning.

&&

.AVIATION...MVFR conditions with IFR conditions in showers and
thunderstorms expected today until around 23z for ne Fl TAF
sites. Strong gusty winds and heavy downpours will likely occur in
storms. VFR conditions expected to prevail in se Ga at SSI with
showers and storms expected to be more isolated this afternoon and
evening. Cold front will push se across the area tonight with sw
winds shifting to the wnw by 12z Monday.

&&

.MARINE...SW winds will increase to near 15 knots today with
showers and thunderstorms moving across the waters this afternoon
and evening ahead of a cold front. A few storms over the coastal
waters could be strong with frequent cloud to water lighting.
The cold front will move push south of the waters by Monday
morning. The front will dissipate on Monday with an east coast
sea breeze developing over the waters Monday afternoon and
evening. With high pressure building to the north a northeasterly
flow will develop for Tuesday and Wednesday.

Rip Currents: Low risk anticipated due to offshore winds and
diminishing swells.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  85  64  87  64 /  40  20   0   0
SSI  84  69  85  70 /  70  20   0  10
JAX  87  67  89  67 /  90  20   0   0
SGJ  85  70  87  68 /  90  20  10   0
GNV  84  65  89  64 /  80  20   0   0
OCF  84  67  89  64 /  80  30   0   0

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

Zibura/Kennedy/Cordero

In the hours before

Local storm report, May 5, 11:45 AM EDT, 10 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, May 5, 11:46 AM EDT, 9 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, May 5, 11:47 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>
Special weather statement, May 5, 11:48 AM EDT, 7 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, May 5, 11:48 AM EDT, 7 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, May 5, 11:50 AM EDT, 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>

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 1:09 AM EDTSpecial Weather StatementJAXHamilton36 min
May 5, 2:17 AM EDTSpecial Weather StatementJAXColumbia28 min
May 5, 3:09 AM EDTSpecial Weather StatementJAXColumbia21 min
May 5, 3:19 AM EDTSpecial Weather StatementJAXBaker26 min
May 5, 3:54 AM EDTSpecial Weather StatementJAXBaker36 min
May 5, 4:24 AM EDTSpecial Marine WarningJAX36 min
May 5, 4:49 AM EDTSpecial Marine WarningJAX41 min
May 5, 4:52 AM EDTSpecial Marine WarningJAX53 min
May 5, 10:11 AM EDTSpecial Weather StatementJAXGilchrist49 min
May 5, 10:41 AM EDTSpecial Weather StatementJAXBradford, Clay, Union49 min
May 5, 10:53 AM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Union37 min
May 5, 11:02 AM EDTSpecial Weather StatementJAXAlachua43 min
May 5, 11:15 AM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Nassau, Union45 min
May 5, 11:26 AM EDTSpecial Marine WarningJAX94 min
May 5, 11:31 AM EDTSevere Thunderstorm WarningJAXAlachua, Marion, Putnam44 min
May 5, 11:35 AM EDTSpecial Weather StatementJAXMarion40 min
May 5, 11:46 AM EDTSpecial Weather StatementJAXDuval44 min
May 5, 11:48 AM EDTSpecial Weather StatementJAXClay42 min
May 5, 12:05 PM EDTSevere Thunderstorm WarningJAXMarion, Putnam40 min
May 5, 12:10 PM EDTSpecial Marine WarningJAX95 min
May 5, 12:14 PM EDTSpecial Weather StatementJAXMarion46 min
May 5, 12:25 PM EDTSevere Thunderstorm WarningJAXClay, Flagler, Putnam, Saint Johns50 min
May 5, 12:43 PM EDTSpecial Marine WarningJAX92 min
May 5, 1:01 PM EDTSpecial Weather StatementJAXMarion44 min
May 5, 1:04 PM EDTSpecial Weather StatementJAXFlagler41 min
May 5, 1:39 PM EDTSpecial Weather StatementJAXMarion51 min
May 5, 2:14 PM EDTSpecial Marine WarningJAX46 min
May 5, 2:41 PM EDTSpecial Weather StatementJAXFlagler, Putnam34 min
May 4, 9:41 PM EDTSpecial Weather StatementJAXClinch, Ware49 min
May 5, 1:58 AM EDTSpecial Weather StatementJAXCharlton32 min
May 5, 7:48 AM EDTSpecial Weather StatementJAXCharlton42 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019Every severe thunderstorm warning in 2019

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.