Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 313, NWS Jacksonville, FL

September 25, 2023Clay County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 25, 2023, 4:13 PM EDT for Clay County, Saint Johns County, Florida. It was in force for 32 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: Sep 25, 2023, 4:13 PM EDT (20:13 UTC)
Expired: Sep 25, 2023, 4:45 PM EDT
In force: 32 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clay County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 60 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 198 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: 735 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 881 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 75 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 Sep 25, 3:08 PM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, Sep 25, 3:08 PM EDT, 1 hour 5 minutes before

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In the hours before

Special weather statement, Sep 25, 3:21 PM EDT, 52 minutes before

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Special weather statement, Sep 25, 3:55 PM EDT, 18 minutes before

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  <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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        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.

Issued	Product	Office	Counties	Lasted
Sep 25, 3:21 PM EDT	Special Weather Statement	JAX	Flagler	24 min
Sep 25, 3:55 PM EDT	Special Weather Statement	JAX	Clay	35 min
Sep 25, 4:44 PM EDT	Special Weather Statement	JAX	Saint Johns	31 min
Sep 25, 5:52 PM EDT	Special Weather Statement	JAX	Alachua	23 min
Sep 25, 5:53 PM EDT	Special Weather Statement	JAX	Marion	37 min
Sep 25, 6:50 PM EDT	Areal Flood Advisory	JAX	Marion	70 min
Sep 25, 6:58 PM EDT	Special Weather Statement	JAX	Putnam	32 min
Sep 25, 7:45 PM EDT	Areal Flood Advisory	JAX	Putnam	2 hr
Sep 25, 7:49 PM EDT	Special Weather Statement	JAX	Putnam	26 min
Sep 25, 7:50 PM EDT	Special Weather Statement	JAX	Putnam	25 min

Nearby

Severe Thunderstorm Warnings in Florida, 2023 Every severe thunderstorm warning in 2023

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.