Alert archive / Georgia / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 97, NWS Jacksonville, FL

May 21, 2020Nassau County, Florida; Camden County, Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at May 21, 2020, 3:15 PM EDT for Nassau County, Florida; Camden County, Charlton County, Georgia. It was in force for 14 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 21, 2020, 3:15 PM EDT (19:15 UTC)
Expired
May 21, 2020, 3:29 PM EDT
In force
14 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Nassau County, FL, Camden County, GA, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 35 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 33 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 2020-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1487 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 2020-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
1487 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
706 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.6

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 21, 1:44 PM EDT, 1 hour 31 minutes earlier.

Area forecast discussion, May 21, 1:44 PM EDT, 1 hour 31 minutes before
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In the hours before

Special weather statement, May 21, 2:12 PM EDT, 1 hour 3 minutes before
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Special weather statement, May 21, 2:32 PM EDT, 43 minutes before
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      <div class="status" id="status">Temporary Notice</div>
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Special weather statement, May 21, 2:48 PM EDT, 27 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.
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      <p id="message2">
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Special weather statement, May 21, 3:13 PM EDT, 2 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.
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      <p id="message2">
        Please try again in a few minutes.
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The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 2:16 AM EDTRip Current StatementJAXDuval, Flagler, Nassau25 hr
May 21, 3:03 AM EDTSmall Craft AdvisoryJAX31 hr
May 21, 3:34 PM EDTSpecial Marine WarningJAX86 min
May 21, 4:12 PM EDTSpecial Marine WarningJAX63 min
May 21, 4:38 PM EDTSevere Thunderstorm WarningJAXNassau36 min
May 21, 4:51 PM EDTSpecial Marine WarningJAX75 min
May 21, 4:55 PM EDTSpecial Weather StatementJAXNassau35 min
May 21, 4:58 PM EDTSevere Thunderstorm WarningJAXNassau32 min
May 21, 5:18 PM EDTSpecial Weather StatementJAXDuval42 min
May 21, 5:33 PM EDTSpecial Weather StatementJAXNassau27 min
May 21, 6:03 PM EDTSpecial Marine WarningJAX87 min
May 21, 6:10 PM EDTSpecial Weather StatementJAXDuval35 min
May 21, 6:53 PM EDTSpecial Marine WarningJAX67 min
May 21, 7:37 PM EDTSpecial Weather StatementJAXSaint Johns38 min
May 21, 7:50 PM EDTSpecial Marine WarningJAX55 min
May 21, 2:12 PM EDTSpecial Weather StatementJAXCharlton48 min
May 21, 2:32 PM EDTSpecial Weather StatementJAXWare28 min
May 21, 2:48 PM EDTSpecial Weather StatementJAXBrantley, Camden, Glynn57 min
May 21, 3:08 PM EDTSevere Thunderstorm WarningJAXBrantley, Camden, Charlton, Ware41 min
May 21, 3:13 PM EDTSpecial Weather StatementJAXWare47 min
May 21, 3:42 PM EDTSpecial Weather StatementJAXBrantley, Glynn48 min
May 21, 3:57 PM EDTSpecial Weather StatementJAXCharlton48 min
May 21, 4:25 PM EDTSpecial Weather StatementJAXCharlton50 min
May 21, 4:27 PM EDTSpecial Weather StatementJAXAtkinson48 min
May 21, 4:30 PM EDTSpecial Weather StatementJAXGlynn30 min
May 21, 4:31 PM EDTSpecial Weather StatementJAXGlynn14 min
May 21, 4:33 PM EDTSevere Thunderstorm WarningJAXGlynn, Wayne28 min
May 21, 5:12 PM EDTSpecial Weather StatementJAXCharlton48 min
May 21, 5:57 PM EDTSpecial Weather StatementJAXCharlton48 min
May 21, 6:22 PM EDTSpecial Weather StatementJAXWare23 min
May 21, 6:34 PM EDTSevere Thunderstorm WarningJAXCharlton, Clinch, Ware29 min
May 21, 7:02 PM EDTSpecial Weather StatementJAXCharlton43 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2020Severe 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.