Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 108, NWS Jacksonville, FL

May 28, 2020Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 28, 2020, 3:14 PM EDT for Saint Johns County, Florida. It was in force for 46 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 28, 2020, 3:14 PM EDT (19:14 UTC)
Expired
May 28, 2020, 4:00 PM EDT
In force
46 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 19:17 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.2 hours before the alert went out and 183 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, Cape Canaveral, FL at 12:00Z on 2020-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1971 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, Cape Canaveral, FL at 12:00Z on 2020-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939Sfc1 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
1971 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
683 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 28, 1:28 PM EDT, 1 hour 46 minutes earlier.

Area forecast discussion, May 28, 1:28 PM EDT, 1 hour 46 minutes before
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In the hours before

Special weather statement, May 28, 2:29 PM EDT, 45 minutes before
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Special weather statement, May 28, 2:37 PM EDT, 37 minutes before
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Special weather statement, May 28, 2:50 PM EDT, 24 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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Local storm report, May 28, 3:02 PM EDT, 12 minutes before
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Special weather statement, May 28, 3:05 PM EDT, 9 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, May 28, 3:10 PM EDT, 4 minutes before
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<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.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 1:29 PM EDTSpecial Weather StatementJAXBradford31 min
May 28, 1:38 PM EDTSpecial Weather StatementJAXPutnam37 min
May 28, 1:40 PM EDTSpecial Weather StatementJAXMarion35 min
May 28, 1:58 PM EDTSpecial Weather StatementJAXPutnam32 min
May 28, 2:00 PM EDTSpecial Weather StatementJAXClay30 min
May 28, 2:01 PM EDTSpecial Weather StatementJAXDuval29 min
May 28, 2:22 PM EDTSpecial Weather StatementJAXClay23 min
May 28, 2:25 PM EDTSpecial Weather StatementJAXPutnam50 min
May 28, 2:29 PM EDTSpecial Weather StatementJAXSaint Johns31 min
May 28, 2:31 PM EDTSpecial Marine WarningJAX59 min
May 28, 2:37 PM EDTSpecial Weather StatementJAXMarion53 min
May 28, 2:50 PM EDTSpecial Weather StatementJAXClay25 min
May 28, 2:53 PM EDTSevere Thunderstorm WarningJAXClay, Duval23 min
May 28, 3:05 PM EDTSpecial Weather StatementJAXFlagler, Saint Johns40 min
May 28, 3:10 PM EDTSpecial Weather StatementJAXDuval35 min
May 28, 3:19 PM EDTSpecial Weather StatementJAXDuval26 min
May 28, 3:21 PM EDTSpecial Marine WarningJAX54 min
May 28, 3:46 PM EDTSpecial Weather StatementJAXFlagler44 min
May 28, 4:06 PM EDTSpecial Marine WarningJAX84 min
May 28, 4:24 PM EDTSpecial Weather StatementJAXAlachua51 min
May 28, 4:58 PM EDTSpecial Weather StatementJAXMarion47 min
May 28, 5:30 PM EDTSpecial Weather StatementJAXAlachua, Gilchrist, Suwannee45 min
May 28, 6:29 PM EDTSpecial Weather StatementJAXColumbia46 min
May 28, 5:25 PM EDTSpecial Weather StatementJAXAtkinson, Bacon, Clinch50 min
May 28, 6:10 PM EDTSevere Thunderstorm WarningJAXAtkinson, Bacon, Coffee, Ware50 min
May 28, 6:47 PM EDTSpecial Weather StatementJAXClinch, Echols43 min
May 28, 6:58 PM EDTSpecial Weather StatementJAXAtkinson, Coffee47 min
May 28, 7:27 PM EDTSpecial Weather StatementJAXWare48 min
May 28, 7:47 PM EDTSpecial Weather StatementJAXClinch43 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020Every 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.